Audio Front Control Module (ACM) Trouble Code (Freelander 2)

Front audio control unit

NOTE: If a module or component failure is suspected and the vehicle remains under manufacturer's warranty, refer to the Warranty Guide (Section B1.2) or determine if there is a previously approved special program in effect before replacing the component.

NOTE: Generic scan tools may not be able to read the codes listed or may only be able to 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 the manufacturer-approved diagnostic system).

NOTE: When performing voltage or resistance tests, always use a digital multimeter (DMM) with three decimal places of accuracy and a valid calibration certificate. When testing resistance, be sure to include the resistance of the DMM leads.

NOTE: Before starting diagnostic programs using fault location tests, check and correct basic faults.

NOTE: Inspect the connectors for signs of water ingress and their pins for damage and/or corrosion.

NOTE: If DTCs are set and the fault is not present after performing the troubleshooting tests, an intermittent problem may be the cause. Be sure to check for loose connections and corroded terminals.

Description and operation

For a detailed description of the front audio control unit, refer to the relevant section "Description and operation" of the workshop manual. For additional information, refer to the chapter: Audio system (415-01 Infotainment system, Description and operation).

DTC	Description	Possible reason	Action
B1134-11	Telephone signal input	Telephone signal input circuit: short to ground	Using the electrical diagrams, check the telephone input circuit for a short to ground
B1134-12	Telephone signal input	Telephone signal input circuit: short circuit to power supply	Using the electrical diagrams, check the telephone input circuit for a short circuit to power
B1134-13	Telephone signal input	Telephone signal input electrical circuit: open circuit	Using the electrical diagrams, check the telephone input circuit for an open circuit
B1A01-11	Speaker #1	Left Front Speaker Circuit Short to Ground	Using the electrical diagrams, check the front left speaker circuit for a short to ground
B1A01-12	Speaker #1	Left Front Speaker Circuit Short to Power	Using the electrical diagrams, check the front left speaker circuit for a short to power
B1A01-1A	Speaker #1	Left Front Speaker Circuit: Resistance Below Threshold	Perform the troubleshooting tests associated with this DTC using the manufacturer approved diagnostic system
B1A01-1B	Speaker #1	Left Front Speaker Circuit: Resistance Above Threshold	Perform the troubleshooting tests associated with this DTC using the manufacturer approved diagnostic system
B1A01-1C	Speaker #1	Left Front Speaker Circuit: Voltage Out of Range	Perform the troubleshooting tests associated with this DTC using the manufacturer approved diagnostic system
B1A02-11	Speaker #2	Right Front Speaker Circuit: Short to Ground	Using the electrical diagrams, check the front right speaker circuit for a short to ground
B1A02-12	Speaker #2	Right Front Speaker Circuit: Short to Power	Using the electrical diagrams, check the front right speaker circuit for a short to power
B1A02-1A	Speaker #2	Right Front Speaker Circuit: Resistance Below Threshold	Perform the troubleshooting tests associated with this DTC using the manufacturer approved diagnostic system
B1A02-1B	Speaker #2	Right Front Speaker Circuit: Resistance Above Threshold	Perform the troubleshooting tests associated with this DTC using the manufacturer approved diagnostic system
B1A02-1C	Speaker #2	Right Front Speaker Circuit: Voltage Out of Range	Perform the troubleshooting tests associated with this DTC using the manufacturer approved diagnostic system
B1A03-11	Speaker #3	Left Rear Speaker Circuit: Short to Ground	Using the electrical diagrams, check the rear left speaker circuit for a short to ground
B1A03-12	Speaker #3	Left Rear Speaker Circuit: Short to Power	Using the electrical diagrams, check the rear left speaker circuit for a short to power
B1A03-1A	Speaker #3	Left rear speaker circuit: resistance below threshold	Perform the troubleshooting tests associated with this DTC using the manufacturer approved diagnostic system
B1A03-1B	Speaker #3	Left rear speaker circuit: resistance above threshold	Perform the troubleshooting tests associated with this DTC using the manufacturer approved diagnostic system
B1A03-1C	Speaker #3	Left Rear Speaker Circuit: Voltage Out of Range	Perform the troubleshooting tests associated with this DTC using the manufacturer approved diagnostic system
B1A04-11	Speaker #4	Right Rear Speaker Circuit: Short to Ground	Using the electrical diagrams, check the rear right speaker circuit for a short to ground
B1A04-12	Speaker #4	Right Rear Speaker Circuit: Short to Power	Using the electrical diagrams, check the rear right speaker circuit for a short to power
B1A04-1A	Speaker #4	Right rear speaker circuit: resistance below threshold	Perform the troubleshooting tests associated with this DTC using the manufacturer approved diagnostic system
B1A04-1B	Speaker #4	Right rear speaker circuit: resistance above threshold	Perform the troubleshooting tests associated with this DTC using the manufacturer approved diagnostic system
B1A04-1C	Speaker #4	Right Front Speaker Circuit: Voltage Out of Range	Perform the troubleshooting tests associated with this DTC using the manufacturer approved diagnostic system
B1A56-13	Antenna	Antenna circuit: open circuit	Refer to the electrical diagrams and check the antenna electrical circuit for an open circuit
B1B69-11	12V Antenna Power Supply Circuit	12V Antenna Power Circuit: Short to Ground	Using the electrical diagrams, check the 12V antenna supply circuit for a short to ground
B1B69-15	12V Antenna Power Supply Circuit	12V Antenna Power Circuit: Short to Power Circuit, Open Circuit	Using the electrical diagrams, check the 12V antenna power supply circuit for shorts to power and open circuits
B1D19-16	CD player unit	Circuit voltage below limit	Install a new integrated audio unit, see the note on installing a new module/component at the beginning of the DTC index. For additional information, refer to the chapter: Audio Unit (415-01 Infotainment System, Removal and Installation).
B1D19-77	CD player unit	The specified position is not reached	Install a new integrated audio unit, see the note on installing a new module/component at the beginning of the DTC index. For additional information, refer to the chapter: Audio Unit (415-01 Infotainment System, Removal and Installation).
B1D19-93	CD player unit	It doesn't work	Install a new integrated audio unit, see the note on installing a new module/component at the beginning of the DTC index. For additional information, refer to the chapter: Audio Unit (415-01 Infotainment System, Removal and Installation).
B1D78-11	Auxiliary input signal	Accessory Input Circuit Short to Ground	Using the electrical diagrams, check the accessory input circuit for a short to ground
B1D78-12	Auxiliary input signal	Electrical input circuit for additional equipment: short circuit to the power supply circuit	Using the electrical diagrams, check the accessory input circuit for a short to power
B1D78-13	Auxiliary input signal	Additional Equipment Input Electrical Circuit: Open Circuit	Using the electrical diagrams, check the accessory input circuit for an open circuit
B1D79-11	Microphone input signal	Microphone input circuit short to ground	Using the electrical diagrams, check the microphone input circuit for a short to ground
B1D79-12	Microphone input signal	Microphone input circuit: short circuit to power supply	Using the electrical diagrams, check the microphone input circuit for a short to power
B1D79-13	Microphone input signal	Microphone Input Circuit: Open Circuit	Using the electrical diagrams, check the microphone input circuit for an open circuit
U3000-49	Control unit	Internal failure of electronic equipment	Install a new control module, see the note on installing a new module/component at the beginning of the DTC index. For additional information, refer to the chapter: Audio Unit (415-01 Infotainment System, Removal and Installation).
U3000-55	Control unit	Incorrect vehicle configuration data received	Check/update the vehicle configuration file using a manufacturer approved diagnostic system
U3000-87	Control unit	Missing message	Check the central junction box for DTCs and refer to the DTC index. For additional information, refer to the chapter: Communication Network (418-00 Module Communication Network, Diagnosis and Testing). Check the infotainment module for DTCs for the vehicle configuration file and the MOST network and refer to the appropriate DTC index. Perform MOST/CAN network tests using the manufacturer approved diagnostic system
U3000-98	Control unit	Increased temperature of the element or system	Check for additional DTCs and refer to the appropriate DTC index, check/monitor the system to see if the condition reoccurs
U3003-62	Battery voltage	Voltage discrepancy of 2 V or more between integrated control unit and central junction box	Perform the troubleshooting tests associated with this DTC using the manufacturer approved diagnostic system