Diagnostics and testing of the audio system (Discovery 3)

Review

The audio system networks a number of networks and modules in the vehicle to provide a complete entertainment package for passengers.

Due to the complexity of the system, there are a number of different methods used to diagnose the system, as the networks used include the CAN bus (controller area network) and the MOST system (data transmission system for media systems).

For a detailed description of the design and operation of the audio system, refer to the relevant section in the service manual. For information on network diagnostics, refer to the "Network Data Exchange" section in the service manual.

Inspection and verification

1. Ensure that the customer's complaint is justified.

2. Visually inspect for obvious mechanical and electrical problems.

Mechanical factors	Electrical factors
Audio unit status and installation Speaker condition and installation Condition and installation of the amplifier Status and installation of the satellite digital radio system (SDARS) Remote control status and installation SDARS /Global Positioning System (GPS)/Phone Antenna Antennas on the side and rear window Antenna amplifiers Audio/Video Input/Output Panel (AVIO)	Fuses CJB - fuse 42P CJB - fuse 52P CJB - fuse 53P CJB - fuse 53P CJB - fuse 57P CJB - fuse 58P BJB - fuse 18E Wiring harnesses Fiber Optic Wiring Harnesses Wiring harness/electrical connectors Relay for the complex of information and entertainment systems and equipment CAN electrical circuits MOST electrical circuits

3. If an obvious cause for the problem you identified or the customer described is found, resolve it before proceeding with further actions. (if possible).



4. Use the approved diagnostic system or scan tool to retrieve all diagnostic trouble codes (DTCs) before referring to the Symptom Chart and DTC Index.

Since DTCs are stored in more than one module, a full vehicle data read is recommended.

Clear all DTCs after troubleshooting.

DTC Index

NOTE: Generic scan tools cannot read the codes listed or can only read 5-digit codes. Match the 5 digits from the scan tool with the first 5 digits of the listed 7-digit code to identify the fault. (the last 2 digits provide additional information readable by a manufacturer approved diagnostic system).

DTC codes	Description	Possible reasons	Actions
B1A004B	Control module	Request to turn off the amplifier (overheating)	Clear DTCs and retest. Consider atmospheric conditions before discarding module.
B1A0113	Speaker #1	Left Rear Door Speaker Circuit High Resistance	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A011A	Speaker #1	Left Rear Door Speaker Circuit Short to Ground Speaker electrical circuit - short circuit to battery +	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A0213	Speaker #2	Right Rear Door Speaker Circuit High Resistance	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A021A	Speaker #2	Right rear door speaker circuit - short to ground Speaker electrical circuit - short circuit to battery +	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A0313	Speaker #3	Left Front Mid/High Range Speaker Circuit High Resistance	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A031A	Speaker #3	Left Front Mid/High Range Speaker Circuit Short to Ground Speaker electrical circuit - short circuit to battery +	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A0413	Speaker #4	Right Front Mid/High Range Speaker Circuit High Resistance	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A041A	Speaker #4	Right Front Mid/High Range Speaker Circuit Short to Ground Speaker electrical circuit - short circuit to battery +	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A0513	Speaker #5	Left woofer circuit high resistance	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A051A	Speaker #5	Left woofer circuit short to ground Speaker electrical circuit - short circuit to battery +	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A0613	Speaker #6	Right woofer circuit high resistance	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A061A	Speaker #6	Right subwoofer circuit short to ground Speaker electrical circuit - short circuit to battery +	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A0713	Speaker #7	Left Front Woofer Circuit High Resistance	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A071A	Speaker #7	Left Front Woofer Circuit Short to Ground Speaker electrical circuit - short circuit to battery +	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A0813	Speaker #8	Right Front Woofer Circuit High Resistance	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A081A	Speaker #8	Right Front Woofer Circuit Short to Ground Speaker electrical circuit - short circuit to battery +	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A0913	Speaker #9	Left Rear Surround Speaker Circuit High Resistance	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A091A	Speaker #9	Left Rear Surround Speaker Circuit Short to Ground Speaker electrical circuit - short circuit to battery +	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A1013	Speaker #10	Right Rear Surround Speaker Circuit High Resistance	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A101A	Speaker #10	Left Rear Surround Speaker Circuit Short to Ground Speaker electrical circuit - short circuit to battery +	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A1113	Speaker #11	Center Front Additional Speaker Circuit High Resistance	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A111A	Speaker #11	Front center additional speaker circuit short to ground Speaker electrical circuit - short circuit to battery +	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A1213	Speaker #12	Low frequency speaker circuit - high resistance	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A121A	Speaker #12	Subwoofer electrical circuit - short to ground Speaker electrical circuit - short circuit to battery +	Refer to the electrical guide and check the speaker circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A9668	The bus remains active after a shutdown request.	The lamp remains active for 2 seconds after a request to turn off.	Perform a general MOST check. Refer to the Network Communications section in the workshop manual.
B1D8413	Headphone Panel 1	Headphone Panel Circuit 1 - High Resistance	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1D8513	Headphone Panel 2	Headphone Panel Circuit 2 - High Resistance	Check the electrical circuits of the power supply and ground of the element. Refer to the electrical equipment manual.
B1D8613	Headphone Panel 3	Headphone Panel Circuit 3 - High Resistance	Check the electrical circuits of the power supply and ground of the element. Refer to the electrical equipment manual.
B1D8713	Headphone Panel 4	Headphone Panel Circuit 4 - High Resistance	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A5601	Antenna	The antenna connection is broken	Refer to the electrical guide and check the antenna circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1D2101	Remote control switch	General electrical fault	Check the electrical circuits of the power supply and ground of the element. Refer to the electrical equipment manual.
B1D2115	Remote control switch	Remote control switch electrical circuit - short circuit to battery + Remote Control Switch Circuit High Resistance	Refer to the electrical guides and check the remote control circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1D7901	Microphone input signal	Microphone electrical circuit - open, short to ground or short to battery + Microphone configuration mismatch with CCF	Refer to the electrical guide and check the microphone input circuit. Configure the system using the approved diagnostic system. Refer to the guided diagnostic program for this code on the approved diagnostic system.
U001087	Medium speed CAN bus	No message from audio unit	Check the CAN circuits. Refer to the electrical equipment manual. Refer to the "Network Communication" section in the workshop manual.
U007388	Control module data bus "A" shutdown	The bus is disconnected	Check for other diagnostic trouble codes (DTCs). Clear all DTCs and road test the vehicle. If the problem persists, contact your dealer for further assistance. Do not replace any components to resolve this problem. Refer to the Network Communications section of the service manual.
U018487	Lost connection with radio receiver	No message	Refer to the "Network Communication" section in the service station manual.
U01874A	Lost Communication with Disc Player/Changer Module	Lost Communication with Disc Player/Changer Module Incorrect element installed The MOST network security system does not allow unauthorized addition of a module to the system.	Set up the network configuration to recognize the module using the prescribed diagnostic system.
U030055	Software incompatibility	Audio block is not configured	Configure the module using an approved diagnostic system.
U1A1448	CAN initialization failure	ACM control software failure	Check the electrical power and ground circuits of the component. Refer to the electrical manual. Configure the module(s) using the approved diagnostic system. If a module is suspect, refer to the warranty policy and procedures manual.
U1A1449	CAN initialization failure	Internal electronic malfunction	Check the electrical power and ground circuits of the component. Refer to the electrical manual. Configure the module(s) using the approved diagnostic system. If a module is suspect, refer to the warranty policy and procedures manual.
U1A254A	Lost connection with ICM	Incorrect element installed The MOST network security system does not allow unauthorized addition of a module to the system.	Perform a general MOST check. Refer to the Network Communications section in the workshop manual.
U1A264A	Lost connection with TEL	Incorrect element installed The MOST network security system does not allow unauthorized addition of a module to the system.	Perform a general MOST check. Refer to the Network Communications section in the workshop manual.
U1A274A	Lost connection with REM	Incorrect element installed The MOST network security system does not allow unauthorized addition of a module to the system.	Perform a general MOST check. Refer to the Network Communications section in the workshop manual.
U1A284A	Lost connection with SRM	Incorrect element installed The MOST network security system does not allow unauthorized addition of a module to the system.	Perform a general MOST check. Refer to the Network Communications section in the workshop manual.
U1A294A	Lost connection with AAM	Incorrect element installed The MOST network security system does not allow unauthorized addition of a module to the system.	Perform a general MOST check. Refer to the Network Communications section in the workshop manual.
U1A304A	Lost connection with TVM	Incorrect element installed The MOST network security system does not allow unauthorized addition of a module to the system.	Perform a general MOST check. Refer to the Network Communications section in the workshop manual.
U1A314A	Lost connection with TMC	Incorrect element installed The MOST network security system does not allow unauthorized addition of a module to the system.	Perform a general MOST check. Refer to the Network Communications section in the workshop manual.
U200325	Fiber optic data transmission bus	Signal shape/curve error	Perform a general MOST check. Refer to the Network Communications section in the workshop manual.
U200331	Fiber optic data transmission bus	MOST Circuit Break - No Data Received	Perform a general MOST check. Refer to the Network Communications section in the workshop manual.
U200381	Fiber optic data transmission bus	Invalid serial data received	Perform a general MOST check. Refer to the Network Communications section in the workshop manual.
U200386	Fiber optic data transmission bus	Invalid signal	Perform a general MOST check. Refer to the Network Communications section in the workshop manual.
U200388	Fiber optic data transmission bus	The bus is disconnected	Perform a general MOST check. Refer to the Network Communications section in the workshop manual.
U300044	Control module	Audio unit data memory failure	Check the power and ground circuits of the component. Refer to the electrical manual. If the module is suspect, refer to the warranty policy and procedures manual.
U300048	Control module	Audio unit control software failure (internal error)	Check the power and ground circuits of the component. Refer to the electrical manual. If the module is suspect, refer to the warranty policy and procedures manual.
U300049	Control module	Internal electronic failure of the audio unit (internal error)	Check the power and ground circuits of the component. Refer to the electrical manual. If the module is suspect, refer to the warranty policy and procedures manual.
U300055	Control module	Audio unit configuration not set up The code may also be set due to a wiring harness fault EQ setting does not match vehicle information in IHU	Configure the module using an approved diagnostic system.
B100E25	Input video signal "A"	TV/Rear Seat Entertainment Video Input - Disconnected TV/DVD malfunction	Make sure the input signal is connected and the system is transmitting.
B101025	Input video signal "C"	Rear camera video input - disconnected Camera malfunction	Make sure the input signal is connected and the system is transmitting.
B1B0049	Additional module "A"	Navigation module - internal electrical fault	Check the temperature conditions and the correct installation of the navigation module. If necessary, install a new navigation module, refer to the note on installing a new module/component at the top of this DTC Index
B1D6249	Additional module "B"	Vehicle Information and Communication System (VICS) Module - Internal Electrical Malfunction	Check the module's power and ground circuits. Refer to the electrical manual. If the module is suspect, refer to the warranty policy and procedures manual.
B1D6287	Additional module "B"	Vehicle Information and Communication System (VICS) Module Circuit Short to Ground VICS Module Electrical Circuit - Short Circuit + Battery VICS Module Circuit High Resistance VICS module is disconnected VICS module failure	Refer to the electrical schematics and check the VICS module circuits for a short to ground, short to battery, or open. Check and install a new VICS module if necessary. Configure the system using the approved diagnostic system. If the module is suspected, refer to the warranty policy and procedures manual.
U1A0087	Private bus electrical circuit	Missing Message from Front Entertainment Module (FEM) No connector on the multimedia module Communication network failure.	Refer to the description of the lost connection condition at the beginning of the Network Communications section in the Service Station Manual.
U1A0131	Data exchange channel	NOTE: A message is displayed "NO NAVIGATION AVAILABLE" (navigation is not available) Navigation system module touch screen display (TSD), video interface (GVIF) malfunction GVIF disconnected GVIF - short to ground, short to battery +, open circuit	Check if the GVIF circuit connectors are connected correctly. Refer to the electrical diagrams and check the GVIF circuits of the multimedia module for short circuit to ground, short circuit to battery +, or open circuit.
B1A0044	Control module	Rear Entertainment Control Module - Module Data Memory Malfunction	If a module is suspected, refer to the Warranty Policy and Procedures Guide.
B1A0098	Control module	Rear Entertainment Control Module, Component, or System Overheating	Check the module and electrical circuits. Refer to the electrical manuals. Clear the DTCs and retest. Consider the atmospheric conditions before concluding that the module is faulty.
B1D5079	DVD player	DVD Changer - Mechanical Failure Error Report by AiNet	Check for mechanical failure (jamming of the magazine, etc.). Repair if necessary.
B1D5093	DVD player	DVD changer not responding Data transfer error between main microprocessor and DVD microprocessor No response from AiNet	Refer to the electrical manual and check the AiNet electrical circuits. Repair if necessary.
B1D5098	DVD player	High temperature condition detected	Check the DVD module installation. Ensure there is sufficient air flow. Clear DTCs and retest. Consider atmospheric conditions before concluding that the module is faulty.
B1D8193	Left Rear Display Module	Left rear display not responding Data transmission error between main microprocessor and left display microprocessor No response from IS bus	Check the IS bus electrical circuits. Refer to the electrical equipment manuals.
B1D8198	Left Rear Display Module	High temperature condition detected	Clear DTCs and retest. Consider atmospheric conditions before concluding that the module is faulty.
B1D8293	Right Rear Display Module	Right rear display not responding Data transmission error between main microprocessor and right display microprocessor No response from IS bus	Check the IS bus electrical circuits. Refer to the electrical equipment manuals.
B1D8298	Right Rear Display Module	High temperature condition detected	Clear DTCs and retest. Consider atmospheric conditions before concluding that the module is faulty.
B1D8393	Central Rear Display Module	The central rear display is not responding Data transmission error between main microprocessor and right display microprocessor No response from IS bus	Check the IS bus electrical circuits. Refer to the electrical equipment manuals.
B1D8398	Central Rear Display Module	High temperature condition detected	Clear DTCs and retest. Consider atmospheric conditions before concluding that the module is faulty.
U1A0355	Vehicle configuration parameters	Rear Entertainment Module (REM) - Configuration Not Configured	Configure the module using an approved diagnostic system.
U1A1731	Incomplete MOST circuit registered by REM	No signal from Rear Entertainment Module (REM) A fiber optic circuit break condition has been detected	Perform a MOST General Check. Refer to the Network Communications section in the workshop manual and the approved diagnostic system.
U1A334A	Lost connection with ACM	Lost Communication with Front Audio Control Module (ACM) - Incorrect Component Installed The MOST network security system prevents unauthorized modules from being added to the system.	Set up the network configuration to recognize the module using the prescribed diagnostic system.
B1A004A	Control module	Traffic Management Channel (TMC) Module - Incorrect Item Installed (possible wrong region)	Configure the system using an approved diagnostic system.
B1A5618	Antenna	Traffic Management Channel (TMC) Antenna Circuit Current Below Threshold	Refer to the electrical manual and check the antenna electrical circuit. Refer to the electrical manual. Repair if necessary.
B1A5619	Antenna	Traffic Management Channel (TMC) Antenna Circuit Current Above Threshold	Refer to the electrical manual and check the antenna electrical circuit. Repair if necessary.
B1A0016	Control module	Control Module Electrical Circuit - Voltage Below Threshold Voltage below normal for more than 10 seconds (main control module voltage - 2V) Low battery voltage Control Module Circuit High Resistance	Check the battery condition and charge. Refer to the relevant section in the service station manual. Check the module power and ground circuits. Refer to the electrical equipment manuals.
B1A0017	Control module	Control Module Electrical Circuit - Voltage Above Threshold High battery voltage (reload) Control module electrical circuit - short circuit to battery +	Check the battery condition and charge. Refer to the relevant section in the service station manual. Check the module power and ground circuits. Refer to the electrical equipment manuals.
B1A0048	Control module	Control module control software malfunction	Configure the module using an approved diagnostic system. If the module is suspect, refer to the warranty policy and procedures manual.
B1A5611	Antenna	Antenna electrical circuit - short circuit to ground	Refer to the electrical guide and check the antenna circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A5612	Antenna	Antenna electrical circuit - short circuit to battery +	Refer to the electrical guide and check the antenna circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A5613	Antenna	Antenna electrical circuit - high resistance	Refer to the electrical guide and check the antenna circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1D5511	Antenna No.2	Antenna 2 Circuit Short to Ground	Check the antenna and electrical circuits. Refer to the electrical equipment manual.
B1D5512	Antenna No.2	Antenna 2 electrical circuit - short circuit to battery +	Check the antenna and electrical circuits. Refer to electrical equipment manuals.
B1D5513	Antenna No.2	Antenna Circuit 2 - High Resistance	Check the antenna and electrical circuits. Refer to electrical equipment manuals.
B1D5611	Electrical circuit of antenna #3	Antenna 3 Circuit Short to Ground	Check the antenna and electrical circuits. Refer to electrical equipment manuals.
B1D5612	Electrical circuit of antenna #3	Antenna 3 electrical circuit - short circuit to battery +	Check the antenna and electrical circuits. Refer to electrical equipment manuals.
B1D5613	Electrical circuit of antenna #3	Antenna Circuit 3 - High Resistance	Check the antenna and electrical circuits. Refer to electrical equipment manuals.
B1D5711	Electrical circuit of antenna #4	Antenna 4 Circuit Short to Ground	Check the antenna and electrical circuits. Refer to electrical equipment manuals.
B1D5712	Electrical circuit of antenna #4	Antenna 4 electrical circuit - short circuit to + battery	Check the antenna and electrical circuits. Refer to electrical equipment manuals.
B1D5713	Electrical circuit of antenna #4	Antenna Circuit 4 - High Resistance	Check the antenna and electrical circuits. Refer to electrical equipment manuals.
B1D5811	TV output	Television output signal circuit short to ground	Check the TV output circuits. Refer to the electrical equipment manuals.
B1D5812	TV output	TV output signal electrical circuit - short circuit to battery +	Check the TV output circuits. Refer to the electrical equipment manuals.
B1D5813	TV output	TV output circuit - high resistance	Check the TV output circuits. Refer to the electrical equipment manuals.
U1A2087	Incomplete MOST circuit registered by TVM	No signal from the TV module (TVM) A fiber optic circuit break condition has been detected	Perform a MOST General Check. Refer to the Network Communications section in the workshop manual and the approved diagnostic system.
B1A0049	Control module	Internal electrical fault in amplifier (this code can be registered in multiple modules) Touch Screen Display (TSD) Internal Electrical Malfunction (may occur in multiple modules)	Check the module's power and ground circuits. Refer to the electrical manuals. If the module is suspect, refer to the warranty policy and procedures manual.
U1A0362	Vehicle configuration parameters	Signal matching error	Configure the module using an approved diagnostic system.
U300004	Control module	Internal audio unit malfunction - no connection with CD module	Check the power and ground circuits of the component. Refer to the electrical manual. If the module is suspect, refer to the warranty policy and procedures manual.
U30004A	Control module	Audio Control Module - Incorrect Item Installed The MOST network security system does not allow unauthorized module addition to the system. The 'SRM Installed' parameter is not configured in the vehicle configuration file (SRM is installed), but the module is installed on the car.	Set up the network configuration to recognize the module using the prescribed diagnostic system.
U300055	Control module	Audio unit configuration not set up The code may also be set due to a wiring harness fault EQ setting does not match vehicle information in IHU	Configure the module using an approved diagnostic system.
U300068	Control module	Event Information for Audio Block - MOST Transceiver Overheating	Refer to the electrical manuals and check the component power and ground circuits. Check the MOST circuit. Perform a general MOST test. Refer to the Network Communications section of the workshop manual and the approved diagnostic system. If a module is suspected, refer to the warranty policy and procedures manual.

Diagnosis of SDARS (digital satellite radio broadcasting)

The following information is intended to assist in diagnosing basic problems with your satellite radio system.

Diagnostic trouble codes (DTCs) serve as the primary source of information when diagnosing problems other than basic faults.

There are five conditions that can affect the channels available:

A: No signal available

The signal does not reach the module.

The vehicle must be in a direct line of communication with the satellite, i.e. in an open area and without any obstacles between the vehicle and the satellite.

NOTE: If the vehicle is located outside of America, this is the only possible condition.

B: More than 6 months have passed without a subscription

The original text can be found at www.LRman.ru
There is a 6-month free broadcasting period on channel 184 to allow testing of the system.

After this period, it is no longer possible to receive channels and a message about the lack of subscription is displayed.

C: Less than 6 months have passed without a subscription

The car can only receive channel 184, on other channels a message about the lack of subscription will be displayed.

D: Family package subscription completed

All channels will be listened to, but adult channels will be blocked and unsubscribed messages will be displayed for these channels.

E: Subscription to the full package has been issued

All channels are available except for some paid channels. In this situation, a message about the lack of subscription will be displayed for such channels.

System check

Tune in to channel 184 (typically this is the default channel for all presets.).

Select the direct channel input function by pressing the " key.#".

This operation will ensure that the audio signal is sent to the speakers if the C, D or E condition is present.

If status B is present, a subscription will be required.

1. Are other systems affected?

The most common symptom is loss of audio signal from other infotainment equipment.; a good indicator of MOST problems is the failure of the display to switch from the home screen.

If other systems are affected, check the infotainment system's electrical circuits for loose or damaged electrical connectors and other damage. Refer to the electrical system manual.

2. If only the satellite radio system is affected, retrieve DTCs from the module using the prescribed diagnostic system or scan tool.

Refer to the DTC index above.

On-screen indication	Sign of malfunction	Possible reasons	Notes/Actions
No signal or Searching for signal	No channels available	Antenna connections	Check for diagnostic trouble codes (DTCs) Check the connections from the module to the antenna and from the antenna to the wiring harness. Repair as necessary.
No signal or Searching for signal	No audio signal	MOST connection	Check for diagnostic trouble codes (DTCs) Check the operation of other components of the audio system. Check the connections to other MOST components.
No subscription	No channels available	Free trial expired	Perform the above checks.
Weather/Emergency	No audio signal or CD or other element	Another component of the audio system may be faulty.	Check for diagnostic trouble codes (DTCs) Check the operation of other components of the audio system.

DTC	Name	Possible reason	Action
B1A5614	Antenna	Ground Radio Antenna Electrical Circuit - Short to Ground Antenna electrical circuit - high resistance	Refer to the electrical manual and check the antenna electrical circuit. Check the coaxial cable and connectors for damage, etc. Repair if necessary.
B1A8911	Satellite dish	Short to ground in electrical circuit. The SDARS module has detected a ground condition for longer than expected, or has detected a ground condition when another condition was expected. SDARS Antenna Cable - Short to Ground Internal failure of the SDARS module Internal SDARS antenna failure	Perform all diagnostic pinpoint tests associated with this DTC using the manufacturer approved diagnostic system. Refer to the electrical manuals and check the SDARS antenna cable for a short to ground. Install the SDARS antenna harness as needed. SDARS module suspect, inspect and install a new SDARS module as needed. SDARS antenna suspect, inspect and install a new SDARS antenna as needed. Refer to the new module/assembly installation note at the top of the DTC Index.
B1A8912	Satellite dish	Short circuit to battery + The SDARS module has detected the presence of on-board power for longer than expected, or has detected the presence of on-board power when another indication is expected. SDARS antenna cable - short circuit to battery + Internal failure of the SDARS module Internal SDARS antenna failure	Perform all diagnostic pinpoint tests associated with this DTC using the manufacturer approved diagnostic system. Refer to the electrical manuals and check the SDARS antenna cable for a short to battery power. Install the SDARS antenna harness as needed. SDARS module suspect, inspect and install a new SDARS module as needed. SDARS antenna suspect, inspect and install a new SDARS antenna as needed. Refer to the new module/assembly installation note at the top of the DTC Index.
B1A8913	Satellite dish	Open Circuit. The SDARS module has detected an open circuit due to insufficient bias voltage, low current, no change in the state of the input signal in response to the output signal. SDARS Antenna Cable Circuit Break Internal failure of the SDARS module Internal SDARS antenna failure	Perform all diagnostic pinpoint tests associated with this DTC using the manufacturer approved diagnostic system. Refer to the electrical manuals and inspect the SDARS antenna cable for an open. Install the SDARS antenna harness as needed. SDARS module suspect, inspect and install a new SDARS module as needed. SDARS antenna suspect, inspect and install a new SDARS antenna as needed. Refer to the new module/assembly installation note at the top of the DTC Index.
U300004	Control module	SDARS Module Internal System Fault	SDARS module is suspected, check and install a new SDARS module if necessary, refer to the new module/component installation note at the top of the DTC Index.
U30004A	Control module	SDARS Module Incorrect Element Installed Mismatch of vehicle configuration	Using the manufacturer approved diagnostic system, select the vehicle configuration main menu, vehicle configuration, display and/or modify the vehicle configuration file data. Check for updates if necessary.
U300055	Control module	SDARS module configuration is not configured Invalid vehicle configuration file data received	Using the manufacturer approved diagnostic system, select the vehicle configuration main menu, select the available modules configuration setup menu and program the SDARS module.
B1A8902	Satellite dish	General signal failure HD Antenna Coaxial Cable - Short to Ground, Short to Battery + or Open Internal failure of the high definition tuner module AM/FM diversity antenna amplifier internal failure	Perform all diagnostic pinpoint tests associated with this DTC using the manufacturer approved diagnostic system. Refer to the electrical circuit diagrams and test the HD coaxial antenna cable for a short to ground, short to battery, or open circuit. Install the HD coaxial cable as needed. Suspect the HD tuner module, inspect and install a new HD tuner module as needed. Suspect the AM/FM diversity antenna amplifier, inspect and install a new AM/FM diversity antenna amplifier as needed. Refer to the new module/assembly installation note at the top of the DTC Index.
B1A8911	Satellite dish	Short circuit to ground in electrical circuit. The high definition tuner module has detected a ground fault for longer than expected, or has detected a ground fault when another reading was expected. Short circuit to ground of HD coaxial antenna cable Internal failure of the high definition tuner module AM/FM diversity antenna amplifier internal failure	Perform all diagnostic pinpoint tests associated with this DTC using the manufacturer approved diagnostic system. Refer to the electrical manuals and check the HD coaxial antenna cable for a short to ground. Install the HD coaxial cable as needed. Suspect the HD tuner module, inspect and install a new HD tuner module as needed. Suspect the AM/FM diversity antenna amplifier, inspect and install a new AM/FM diversity antenna amplifier as needed. Refer to the new module/assembly installation note at the top of the DTC Index.
B1A8912	Satellite dish	Short circuit to battery +. The high definition tuner module has detected the presence of on-board power for longer than expected, or has detected the presence of on-board power when another reading was expected. Short circuit to + battery of coaxial antenna cable HD Internal failure of the high definition tuner module AM/FM diversity antenna amplifier internal failure	Perform all diagnostic pinpoint tests associated with this DTC using the manufacturer approved diagnostic system. Refer to the electrical manuals and test the HD coaxial antenna cable for a short to battery power. Install the HD coaxial cable if necessary. Suspect the HD tuner module, test and install a new HD tuner module if necessary. Suspect the AM/FM diversity antenna amplifier, test and install a new AM/FM diversity antenna amplifier if necessary. Refer to the new module/assembly installation note at the top of the DTC Index.
B1A8913	Satellite dish	Open Circuit. The high definition tuner module has detected an open circuit due to insufficient bias voltage, low current, no change in the state of the input signal in response to the output signal. HD Coaxial Antenna Cable Circuit Breakdown Internal failure of the high definition tuner module AM/FM diversity antenna amplifier internal failure	Perform all diagnostic pinpoint tests associated with this DTC using the manufacturer approved diagnostic system. Refer to the electrical manuals and inspect the HD coaxial antenna cable for an open. Install the HD coaxial cable if necessary. The HD tuner module is suspected, inspect and install a new HD tuner module if necessary. The AM/FM diversity antenna amplifier is suspected, inspect and install a new AM/FM diversity antenna amplifier if necessary. Refer to the new module/assembly installation note at the top of the DTC Index.
U200D14	Output power of control module A	Short circuit to ground or open circuit Diversity Antenna Amplifier Power Supply Circuit - Short to Ground, Open Internal failure of the high definition tuner module AM/FM diversity antenna amplifier internal failure	Perform all diagnostic pinpoint tests associated with this DTC using the manufacturer approved diagnostic system. Refer to the electrical guides and check the diversity antenna amplifier power supply circuit for a short to ground or an open. Repair as necessary. Suspect the HD tuner module, test and install a new HD tuner module as necessary. Suspect the AM/FM diversity antenna amplifier, test and install a new AM/FM diversity antenna amplifier as necessary. Refer to the new module/assembly installation note at the top of the DTC Index.
U300004	Control module	High Definition Tuner Module Internal System Failure	High Definition Tuner Module is suspected, check and install a new High Definition Tuner Module if necessary, refer to the New Module/Component Installation Note at the top of the DTC Index.
U30004A	Control module	High Definition Tuner Module Incorrect Item Installed Mismatch of vehicle configuration	Using the manufacturer approved diagnostic system, select the vehicle configuration main menu, vehicle configuration, display and/or modify the vehicle configuration file data. Check for updates if necessary.
U300055	Control module	The HD Tuner Module Configuration is not Configured Invalid vehicle configuration file data received	Using the manufacturer approved diagnostic system, select the vehicle configuration main menu, select the existing modules configuration setup menu and program the HD tuner module.
U300087	Control module	Missing Message The HD Tuner module did not receive one or more expected messages. Invalid local configuration file Local configuration file parameters are missing, out of range, or have an invalid checksum Internal failure of the high definition tuner module	Using the manufacturer approved diagnostic system, select the vehicle configuration main menu, select the new module configuration setup menu, and program the HD Tuner module. Refer to the new module/assembly installation note at the top of the DTC Index.
U300098	Control module	High Definition Tuner Module Element or System Overheating Internal failure of the high definition tuner module	Check the HD Tuner module and its mounting location for causes of high temperature, repair if necessary. Suspect the HD Tuner module, check and install a new HD Tuner module if necessary. Refer to the note on installing a new module/assembly at the top of the DTC Index.