Audio Front Control Module (ACM)

WARNING: This page is about a different car, the 2012 Land Rover Range Rover Sport and 2011 Land Rover Range Rover Sport. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Diagnosis by substitution from a donor vehicle is NOT acceptable. Substitution of control modules does not guarantee confirmation of a fault, and may also cause additional faults in the vehicle being tested and/or the donor vehicle.

NOTE: If the control module or a component is suspect and the vehicle remains under manufacturer warranty, refer to the Warranty Policy and Procedures information, or determine if any prior approval program is in operation, prior to the installation of a new module/component.

NOTE: Generic scan tools may not read the codes listed, or may read only 5-digit codes. Match the 5 digits from the scan tool to the first 5 digits of the 7-digit code listed to identify the fault (the last 2 digits give extra information read by the manufacturer-approved diagnostic system).

NOTE: Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

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

NOTE: If DTCs are recorded and, after performing the pinpoint tests, a fault is not present, an intermittent concern may be the cause. Always check for loose connections and corroded terminals.

The table below lists all Diagnostic Trouble Codes (DTCs) that could be logged in the Audio Control Module, for additional Diagnosis and Testing information refer to the relevant Diagnosis and Testing Information. Refer to INFORMATION AND ENTERTAINMENT SYSTEM .

DTC	Description	Possible causes	Action
B1A56-01	Antenna - General electrical failure	Antenna connection broken Antenna failure	Check antenna connection wiring for integrity Check antenna for signs of damage. Repair wiring or replace antenna as required. Refer to the Warranty Policy and Procedures information, or determine if any prior approval program is in operation, prior to the installation of a new module/component
B1D21-15	Remote control switch - Circuit short to power or open	Circuit to steering wheel switch short to power or open circuit Steering wheel switch fault	Refer to the electrical circuit diagrams and check the circuit between the steering wheel remote control switch and the Audio Control module for short to power or open circuits. Repair wiring as required If no wiring faults found renew switch. Refer to the warranty policy and procedures information if a module is suspect
B1D79-01	Microphone input - General electrical failure	Microphone circuit open circuit, short circuit to ground, short circuit to power Microphone configuration mismatched with Car Configuration File (CCF)	Refer to the electrical circuit diagrams and check the microphone input circuit for open circuit, short circuit to ground, short circuit to power Using the manufacturer approved diagnostic system check and up-date the Car Configuration File (CCF) as required. Clear the DTC and re-test
U0010-88	Medium Speed CAN Communication Bus - Bus off	Power or ground supply to the Audio Control Module (ACM) fault Medium speed CAN network circuit, short to ground, high resistance, open circuit	Refer to the electrical circuit diagrams and check the power and ground connections to the module Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Refer to the electrical circuit diagrams and check the CAN network. Refer to the Network Communications workshop information
U0140-00	Lost communication with Body Control Module - No sub type information	CAN communication error Incorrect component installed	Check for other modules reporting CAN bus off or lost communication faults. Check CAN wiring. Using the manufacturer approved diagnostic system, complete a CAN integrity test. Refer to the electrical circuit diagrams and check the module CAN, power and ground circuits. Refer to the Network Communications workshop information Check that correct component is installed. Using the manufacturer approved diagnostic system check and up-date the Car Configuration File (CCF) as required. Clear the DTC and re-test
U0155-00	Lost communication with Instrument Panel Cluster (IPC) - No sub type information	CAN communication error Incorrect component installed	Check for other modules reporting CAN bus off or lost communication faults. Check CAN wiring. Using the manufacturer approved diagnostic system, complete a CAN integrity test. Refer to the electrical circuit diagrams and check the module CAN, power and ground circuits. Refer to the Network Communications workshop information Check that correct component is installed. Using the manufacturer approved diagnostic system check and up-date the Car Configuration File (CCF) as required. Clear the DTC and re-test
U0156-00	Lost communication with Information Centre "A" - No sub type information	CAN communication error Incorrect component installed	Check for other modules reporting CAN bus off or lost communication faults. Check CAN wiring. Using the manufacturer approved diagnostic system, complete a CAN integrity test. Refer to the electrical circuit diagrams and check the module CAN, power and ground circuits. Refer to the Network Communications workshop information Check that correct component is installed. Using the manufacturer approved diagnostic system check and up-date the Car Configuration File (CCF) as required. Clear the DTC and re-test
0164-00	Lost communication with HVAC Control Module - No sub type information	CAN communication error Incorrect component installed	Check for other modules reporting CAN bus off or lost communication faults. Check CAN wiring. Using the manufacturer approved diagnostic system, complete a CAN integrity test. Refer to the electrical circuit diagrams and check the module CAN, power and ground circuits. Refer to the Network Communications workshop information Check that correct component is installed. Using the manufacturer approved diagnostic system check and up-date the Car Configuration File (CCF) as required. Clear the DTC and re-test
U0166-00	Lost communication with Auxiliary Heater Control Module - No sub type information	CAN communication error Incorrect component installed	Check for other modules reporting CAN bus off or lost communication faults. Check CAN wiring. Using the manufacturer approved diagnostic system, complete a CAN integrity test. Refer to the electrical circuit diagrams and check the module CAN, power and ground circuits. Refer to the Network Communications workshop information Check that correct component is installed. Using the manufacturer approved diagnostic system check and up-date the Car Configuration File (CCF) as required. Clear the DTC and re-test
U0186-00	Lost communication with Audio amplifier "A" - No sub type information	CAN communication error Incorrect component installed	Check for other modules reporting CAN bus off or lost communication faults. Check CAN wiring. Using the manufacturer approved diagnostic system, complete a CAN integrity test.. Refer to the electrical circuit diagrams and check the module CAN, power and ground circuits. Refer to the Network Communications workshop information Check that correct component is installed. Using the manufacturer approved diagnostic system check and up-date the Car Configuration File (CCF) as required. Clear the DTC and re-test
U0191-00	Lost communication with Television - No sub type information	CAN communication error Incorrect component installed	Check for other modules reporting CAN bus off or lost communication faults. Check CAN wiring. Using the manufacturer approved diagnostic system, complete a CAN integrity test. Refer to the electrical circuit diagrams and check the module CAN, power and ground circuits. Refer to the Network Communications workshop information Check that correct component is installed. Using the manufacturer approved diagnostic system check and up-date the Car Configuration File (CCF) as required. Clear the DTC and re-test
U0193-00	Lost communication with Digital Audio Control Module "A" - No sub type information	CAN communication error Incorrect component installed	Check for other modules reporting CAN bus off or lost communication faults. Check CAN wiring. Using the manufacturer approved diagnostic system, complete a CAN integrity test. Refer to the electrical circuit diagrams and check the module CAN, power and ground circuits. Refer to the Network Communications workshop information Check that correct component is installed. Using the manufacturer approved diagnostic system check and up-date the Car Configuration File (CCF) as required. Clear the DTC and re-test
U0194-00	Lost communication with Digital Audio Control Module "B" - No sub type information	CAN communication error Incorrect component installed	Check for other modules reporting CAN bus off or lost communication faults. Check CAN wiring. Using the manufacturer approved diagnostic system, complete a CAN integrity test. Refer to the electrical circuit diagrams and check the module CAN, power and ground circuits. Refer to the Network Communications workshop information Check that correct component is installed. Using the manufacturer approved diagnostic system check and up-date the Car Configuration File (CCF) as required. Clear the DTC and re-test
U0196-00	Lost communication with Entertainment Control Module Rear "A" - No sub type information	CAN communication error Incorrect component installed	Check for other modules reporting CAN bus off or lost communication faults. Check CAN wiring. Using the manufacturer approved diagnostic system, complete a CAN integrity test. Refer to the electrical circuit diagrams and check the module CAN, power and ground circuits. Refer to the Network Communications workshop information Check that correct component is installed. Using the manufacturer approved diagnostic system check and up-date the Car Configuration File (CCF) as required. Clear the DTC and re-test
U0197-00	Lost communication with Telephone Control Module - No sub type information	CAN communication error Incorrect component installed	Check for other modules reporting CAN bus off or lost communication faults. Check CAN wiring. Using the manufacturer approved diagnostic system, complete a CAN integrity test. Refer to the electrical circuit diagrams and check the module CAN, power and ground circuits. Refer to the Network Communications workshop information Check that correct component is installed. Using the manufacturer approved diagnostic system check and up-date the Car Configuration File (CCF) as required. Clear the DTC and re-test
U0237-00	Lost communication with Digital Audio Control Module "C" - No sub type information	CAN communication error Incorrect component installed	Check for other modules reporting CAN bus off or lost communication faults. Check CAN wiring. Using the manufacturer approved diagnostic system, complete a CAN integrity test. Refer to the electrical circuit diagrams and check the module CAN, power and ground circuits. Refer to the Network Communications workshop information Check that correct component is installed. Using the manufacturer approved diagnostic system check and up-date the Car Configuration File (CCF) as required. Clear the DTC and re-test
U0253-00	Lost Communication With Accessory Protocol Interface Module - No sub type information	CAN communication error Incorrect component installed	Check for other modules reporting CAN bus off or lost communication faults. Check CAN wiring. Using the manufacturer approved diagnostic system, complete a CAN integrity test. Refer to the electrical circuit diagrams and check the module CAN, power and ground circuits. Refer to the Network Communications workshop information Check that correct component is installed. Using the manufacturer approved diagnostic system check and up-date the Car Configuration File (CCF) as required. Clear the DTC and re-test
U0256-00	Lost communication with Front Controls Interface Module "A" - No sub type information	CAN communication error Incorrect component installed	Check for other modules reporting CAN bus off or lost communication faults. Check CAN wiring. Using the manufacturer approved diagnostic system, complete a CAN integrity test. Refer to the electrical circuit diagrams and check the module CAN, power and ground circuits. Refer to the Network Communications workshop information Check that correct component is installed. Using the manufacturer approved diagnostic system check and up-date the Car Configuration File (CCF) as required. Clear the DTC and re-test
U0264-00	Lost communication with Camera Module - Rear - No sub type information	CAN communication error Incorrect component installed	Check for other modules reporting CAN bus off or lost communication faults. Check CAN wiring. Using the manufacturer approved diagnostic system, complete a CAN integrity test. Refer to the electrical circuit diagrams and check the module CAN, power and ground circuits. Refer to the Network Communications workshop information Check that correct component is installed. Using the manufacturer approved diagnostic system check and up-date the Car Configuration File (CCF) as required. Clear the DTC and re-test
U0300-00	Internal Control Module Software Incompatibility - No sub type information	Invalid configuration message is received	Using the manufacturer approved diagnostic system re-configure the Audio Control Module (ACM). Clear the DTC and retest
U0300-48	Internal Control Module Software Incompatibility - Supervision software failure	Supervision software failure	Using the manufacturer approved diagnostic system re-configure the Audio Control Module (ACM). Clear the DTC and retest
U0417-00	Invalid Data Received From Park Brake Control Module - No sub type information	Invalid data received from Park Brake Module (PBM)	Check for related DTCs. Refer to the relevant DTC index. Using the manufacturer approved diagnostic system check and up-date the Car Configuration File (CCF) as required. Clear the DTC and re-test
U0422-00	Invalid Data Received From Body Control Module - No sub type information	Invalid data received from Body Control Module (BCM)	Check for related DTCs. Refer to the relevant DTC index. Using the manufacturer approved diagnostic system check and up-date the Car Configuration File (CCF) as required. Clear the DTC and re-test
U0546-00	Invalid Data Received From Entertainment Control Module - Front - No sub type information	Invalid data received from Front Entertainment Control Module	Check for related DTCs. Refer to the relevant DTC index. Using the manufacturer approved diagnostic system check and up-date the Car Configuration File (CCF) as required. Clear the DTC and re-test
U1A14-48	CAN Initialization Failure - Supervision software failure	Audio Control Module (ACM) supervision software failure	Refer to the electrical circuit diagrams and check the power and ground connections to the module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Refer to the electrical circuit diagrams and check the CAN network
U1A14-49	CAN Initialization Failure - Internal electronic failure	Audio Control Module (ACM) internal failure	Check for other modules reporting CAN bus off or lost communication faults. Check CAN wiring. Using the manufacturer approved diagnostic system, complete a CAN integrity test. Refer to the electrical circuit diagrams and check the module CAN, power and ground circuits. Refer to the Network Communications workshop information Check and install a new Audio Control Module (ACM) as required. Refer to the Warranty Policy and Procedures information, or determine if any prior approval program is in operation, prior to the installation of a new module/component
U2003-31	Fibre Optic Communication Bus - No signal	MOST ring break no data received	Carry out the general Media Orientated System Transport (MOST) test. Refer to the Network Communications workshop information
U2003-88	Fibre Optic Communication Bus - Bus off	Bus off	Carry out the general Media Orientated System Transport (MOST) test. Refer to the Network Communications workshop information
U3000-04	Control Module - System internal failures	Audio unit internal failure - no communications with CD module	Refer to the electrical circuit diagrams and check the power and ground circuits to the component. Refer to the Warranty Policy and Procedures information, or determine if any prior approval program is in operation, prior to the installation of a new module/component
U3000-49	Control Module - Internal electronic failure	Audio Control Module (ACM) internal failure	Check and install a new Audio Control Module (ACM) as required. Refer to the Warranty Policy and Procedures information, or determine if any prior approval program is in operation, prior to the installation of a new module/component
U3000-55	Control Module - Not configured	Audio Control Module (ACM) not configured Audio Control Module (ACM) circuit short to ground, short to power, open circuit, high resistance EQ setting not equal to car information of integrated head unit	Using the manufacturer approved diagnostic system re-configure the Audio Control Module (ACM). Clear the DTC and retest. Refer to the electrical circuit diagrams and check Audio Control Module (ACM) circuit for short to ground, short to power, open circuit, high resistance Adjust the EQ setting as required
U3000-68	Control Module - Event information	Audio Control Module (ACM) event information - MOST transceiver overheating	Refer to the electrical circuit diagrams and check the power and ground circuits to the component. Check the MOST circuit. Carry out the general MOST test. Refer to the Network Communications workshop information and in the approved diagnostic system. Clear the DTC and retest. Refer to the Warranty Policy and Procedures information, or determine if any prior approval program is in operation, prior to the installation of a new module/component