Diagnostics and testing of the instrument panel (Discovery 3)

Review

Data from other subsystem modules is sent to the instrument cluster in the form of CAN messages. The instrument cluster identifies the signals and displays the corresponding message in the message center. Most messages are accompanied by a beep or a series of beeps, which are requested by the module generating the message. The driver can view current system status messages via the instrument cluster software by pressing and holding the route data reset button for more than 3 seconds, then the information display will show the current messages in priority order. For more information, see the relevant section of the workshop manual.

Vehicle Configuration File (CCF)

NOTE: If a new instrument cluster is to be fitted, the Instrument Cluster Replacement procedure must be carried out using an approved diagnostic system. This will ensure that the CCF data is correctly transferred from the Central Junction Box (CJB) to the replacement instrument cluster. If the vehicle is serviced from the original factory specification, the CCF will also require updating using an approved diagnostic system. This may include non-standard wheels and/or tyres fitted by the dealer and optional electrical interface accessories such as Park Distance Control.

The CCF contains all relevant data about the specification and sales status of the relevant vehicle, immobilisation codes and driver personalisation settings. This information is stored in the CJB, Engine Control Module (ECM) and Instrument Cluster, allowing each system module to detect which systems and components are fitted to the vehicle. Information is continuously transferred between these three system modules, ensuring seamless data redundancy between the modules.

Inspection and verification

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

2. Confirm which, if any, warning lights and/or messages are illuminated/displayed on the instrument cluster. For a list of messages, refer to the workshop manual, section 413-08, "Message Center".

3. Visually inspect for obvious electrical problems.

Electrical factors

Battery Fuses Central electrical distribution box and battery electrical distribution box Enlarged fuses Wiring harness Damaged, loose or corroded electrical connectors CAN electrical circuits (Control Area Network) Instrument panel Central Junction Box (CJB) Engine Control Module (ECM)

4. If an obvious cause for the problem you identified or the customer described is found, resolve it before moving on to further action. (if possible).

5. Use the approved diagnostic system or scan tool to retrieve all diagnostic trouble codes (DTCs) before accessing the DTC Index.

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).

(The original source of the article is the website: lrman.ru)

DTC codes	Description	Possible cause(s)	Actions
B1A0016	Control module	Low battery voltage Battery ground cable: high resistance Loose/corroded battery connections Battery current leakage	Check the battery condition and charge. Refer to the relevant section in the service station manual. Check the module power and ground electrical circuits. Refer to the electrical equipment manual.
B1A0017	Control module	Control module 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 electrical circuits. Refer to the electrical equipment manual.
B1A0046	Control module	Calibration/parameter memory failure	Configure the module using an approved diagnostic system. If the module is suspect, refer to the warranty policy and procedures manual.
B1A0048	Control module	Control software failure	Configure the module using an approved diagnostic system. If the module is suspect, refer to the warranty policy and procedures manual.
B1A004B	Control module	Control module: high temperature	Consider atmospheric conditions before rejecting the module. Clear DTC and retest. If module is suspect, refer to warranty policy and procedures manual.
B1A1496	RCM warning light	SRS warning light failure	Check the operation of the test lamp. Check the electrical circuits between the RCM and the instrument cluster. Refer to the electrical manual.
B1A7592	Fuel sensor #1	Fuel level sensor circuit: short to ground, short to battery, high resistance Fuel level sensor malfunction	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A7692	Fuel sensor #2	Fuel level sensor circuit: short to ground, short to battery, high resistance Fuel level sensor malfunction	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A7864	Front fog lights	Front fog lamp signal circuit short to ground, short to battery, high resistance Front fog light switch faulty	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A7964	Rear fog lights	Rear fog lamp signal circuit: short to ground, short to battery, high resistance Rear fog light switch faulty	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A8064	Oil pressure	Oil Pressure Signal Circuit Short to Ground, Short to Battery, High Resistance Oil pressure switch malfunction	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A8164	Internal route data switch	Lack of signal credibility	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A8264	External Route Data Switch	External Route Data Switch Signal Circuit: Short to Ground, Short to Battery, High Resistance External Route Data Switch Malfunction	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1A8446	Vehicle configuration data	Calibration/parameter memory failure Configure the module using an approved diagnostic system. If the module is suspect, refer to the warranty policy and procedures manual. B1A8664 Ignition status Lack of signal credibility	Check the ignition status. Check for ignition related DTCs.
B1A8768	Disconnecting the battery / resetting the electronic control unit (ECU)	Event Information Battery disconnected	Check whether the vehicle was started from an external battery using connecting wires. Check the status and charging of the battery. Refer to the corresponding section in the service station manual.
B1A8849	System timer	Internal Electronic Failure The power supply has detected a failure of the real time clock	If a module is suspected, refer to the warranty policy and procedures manual.
U000187	High-speed CAN data bus	No message	Refer to the "Network Communication" section in the service station manual.
U000188	High-speed CAN data bus	High Speed CAN Bus - Off	Refer to the "Network Communication" section in the service station manual.
U001087	Medium speed CAN bus	No message	Refer to the "Network Communication" section in the service station manual.
U001088	Medium speed CAN bus	The bus is disconnected	Refer to the "Network Communication" section in the service station manual.
U010087	Lost Communication with ECM/PCM "A"	No CAN Message for Instrument Cluster/Engine Control Module	Refer to the "Network Communication" section in the service station manual.
U010187	Lost connection with TCM	No CAN Message for Instrument Cluster/Transmission Control Module	Refer to the "Network Communication" section in the service station manual.
U010287	Lost Communication with Transfer Case Control Module	No CAN Message for Instrument Cluster/Transfer Case Control Module	Refer to the "Network Communication" section in the service station manual.
U010487	Lost Communication with Cruise Control Module	No CAN Message for Instrument Cluster/Cruise Control Module	Refer to the "Network Communication" section in the service station manual.
U012287	Lost Communication with Vehicle Dynamics Control Module	No CAN Message for Instrument Cluster/ABS Module	Refer to the "Network Communication" section in the service station manual.
U012687	Lost Communication with Steering Angle Sensor Module	No CAN message for instrument cluster/SAS	Refer to the "Network Communication" section in the service station manual.
U012787	Lost Communication with Tire Pressure Monitoring System Module	No CAN Message for Instrument Cluster/TPMS Module	Refer to the "Network Communication" section in the service station manual.
U012887	Lost Communication With Parking Brake Control Module	No CAN Message for Instrument Cluster/Parking Brake Control Module	Refer to the "Network Communication" section in the service station manual.
U013287	Lost Communication with Suspension Control Module A	No CAN Message for Instrument Cluster/Air Suspension Control Module	Refer to the "Network Communication" section in the service station manual.
U013387	Lost Communication with Active Roll Control Module	No CAN message for instrument cluster/active stability control	Refer to the "Network Communication" section in the service station manual.
U013687	Lost communication with differential control unit - rear	No CAN Message for Instrument Cluster/Rear Differential Electronic Control Module	Refer to the "Network Communication" section in the service station manual.
U013887	Lost Communication with Terrain Response System Control Module	No CAN Message for Instrument Cluster/Terrain Response Control Module	Refer to the "Network Communication" section in the service station manual.
U014087	Lost Communication with Body Control Module	No message	Refer to the "Network Communication" section in the service station manual.
U015187	Lost Communication With Supplemental Restraint System Control Module	No CAN Message for Instrument Cluster/RCM	Refer to the "Network Communication" section in the service station manual.
U015987	Lost Communication With Parking Assist Control Module 'A'	No CAN message for instrument cluster/parking assistance module	Refer to the "Network Communication" section in the service station manual.
U016487	Lost Communication with HVAC Control Module (heating, ventilation, air conditioning)	No CAN message for instrument cluster/ATC module	Refer to the "Network Communication" section in the service station manual.
U016687	Lost communication with auxiliary heater control module	No CAN Message for Instrument Cluster/Auxiliary Heater Control Module	Refer to the "Network Communication" section in the service station manual.
U018287	Lost Communication With Lighting Control Module - Front	No CAN communication for the instrument panel/ Adaptive Front Lighting System (AFS)control module	Refer to the "Network Communication" section in the service station manual.
U018487	Lost connection with radio receiver	No CAN Message for Instrument Cluster/ACM	Refer to the "Network Communication" section in the service station manual.