Diagnostic Procedure

DTC U2300:56 (AUDIO CONTROL UNIT (ACU)) DIAGNOSTIC PROCEDURE

Step	Inspection	Results	Action
1	INSPECT BODY CONTROL MODULE (BCM) AND AUDIO CONTROL UNIT (ACU) FOR MALFUNCTION Perform the DTC inspection for the body control module (BCM) and the audio control unit (ACU). (Refer to the [DTC INSPECTION ] in the appropriate service information) Are any of the following DTCs displayed? Code related to body control module (BCM) communication error, internal malfunction Code related to internal malfunction of audio control unit (ACU)	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (Refer to the [DTC TABLE [BODY CONTROL MODULE (BCM)] ] in the appropriate service information) (See DTC TABLE [AUDIO CONTROL UNIT (ACU)] .)
1		No	Go to the next step.
2	VERIFY REPLACEMENT RECORD OF AUDIO CONTROL UNIT (ACU) Verify if the audio control unit (ACU) has been replaced before performing this troubleshooting procedure. Has the audio control unit (ACU) been replaced?	Yes	After implementing the required servicing according to procedure when replacing a module, perform the repair completion verification. (Refer to the [AUDIO CONTROL UNIT (ACU) REMOVAL/INSTALLATION ] in the appropriate service information)
2		No	Go to the next step.
3	VERIFY IF MALFUNCTION IS CAUSED BY BODY CONTROL MODULE (BCM) CONFIGURATION ERROR Switch the ignition OFF and wait for 30 s or more. Switch the ignition ON (engine off or on) and wait for 30 s or more. Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC ] in the appropriate service information) Perform the DTC inspection for the audio control unit (ACU). (Refer to the [DTC INSPECTION ] in the appropriate service information) Is the same Pending DTC present?	Yes	Go to the next step.
3		No	Go to repair completion verification 2.
4	VERIFY BODY CONTROL MODULE (BCM) CONFIGURATION RELATED DTCs Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC ] in the appropriate service information) Perform the DTC inspection for the body control module (BCM). (Refer to the [DTC INSPECTION ] in the appropriate service information) Is a configuration related DTC displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (Refer to the [DTC TABLE [BODY CONTROL MODULE (BCM)] ] in the appropriate service information)
4		No	Go to the next step.
5	RESET CONFIGURATION DATA FOR BODY CONTROL MODULE (BCM) Using the M-MDS, perform the body control module (BCM) configuration. (Refer to the [CONFIGURATION ] in the appropriate service information) Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC ] in the appropriate service information) Perform the DTC inspection for the audio control unit (ACU). (Refer to the [DTC INSPECTION ] in the appropriate service information) Is the same Pending DTC present?	Yes	Replace the audio control unit (ACU) and perform the repair completion verification. (Refer to the [AUDIO CONTROL UNIT (ACU) REMOVAL/INSTALLATION ] in the appropriate service information)
5		No	Go to repair completion verification 2.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED Install/connect the part removed/disconnected during the troubleshooting procedure. Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC ] in the appropriate service information) Perform the DTC inspection for the audio control unit (ACU). (Refer to the [DTC INSPECTION ] in the appropriate service information) Is the same Pending DTC present?	Yes	Refer to the CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW to inspect for a CAN communication error. (Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW ] in the appropriate service information) If the CAN communication is normal, perform the diagnosis from Step 1. If the malfunction recurs, replace the body control module (BCM), then go to the next step. (Refer to the [BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION ] in the appropriate service information)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs ARE DISPLAYED Perform the DTC inspection. (Refer to the [DTC INSPECTION ] in the appropriate service information) Is a DTC displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.