Troubleshooting Diagnostic Procedure

B1A11-2B: (CMU) TROUBLESHOOTING DIAGNOSTIC PROCEDURE

Step	Inspection	Results	Action
1	PURPOSE: INSPECT CONNECTIVITY MASTER UNIT (CMU) FOR INTERNAL MALFUNCTION Switch the ignition off/main power OFF, and then switch it ON (engine off)/(READY off). Perform the DTC inspection for the connectivity master unit (CMU). (See DTC INSPECTION .) Is a DTC related to an internal malfunction displayed?	Yes	Repair or replace the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [CMU] .)
1		No	Go to the next step.
2	PURPOSE: INSPECT BODY CONTROL MODULE (BCM) FOR INTERNAL MALFUNCTION Perform the DTC inspection for the body control module (BCM). (See DTC INSPECTION .) Is a DTC related to an internal malfunction displayed?	Yes	Repair or replace the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [BCM] .)
2		No	Go to the next step.
3	PURPOSE: INSPECT AUDIO AMPLIFIER FOR MALFUNCTION Clear the DTC recorded in the memory. (See CLEARING DTC .) Perform the DTC inspection for the connectivity master unit (CMU). (See DTC INSPECTION .) Is the DTC B1238-49: displayed?	Yes	Repair or replace the malfunctioning location according to the applicable DTC troubleshooting. (See B1238-49: [CMU] .)
3		No	Go to the next step.
4	PURPOSE: INSPECT WIRING HARNESS (INCLUDING CONNECTOR/TERMINAL) BETWEEN REAR DOOR SPEAKER (LH) AND AUDIO AMPLIFIER FOR MALFUNCTION Inspect the applicable circuit. (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
5	PURPOSE: INSPECT REAR DOOR SPEAKER (LH) FOR MALFUNCTION Inspect the applicable part. (Refer to SPEAKER INSPECTION in service information.) Is the part normal?	Yes	Go to the next step.
5		No	Replace the rear door speaker (LH) and perform the repair completion verification 1. (Refer to REAR DOOR SPEAKER REMOVAL/INSTALLATION in service information.)
6	PURPOSE: INSPECT AUDIO OUTPUT FROM REAR DOOR SPEAKER (LH) Perform the [Active Speaker Check Function] using the diagnostic assist function. (See DIAGNOSTIC ASSIST FUNCTION [CMU] .) Does the rear door speaker (LH) output audio at the time of its turn?	Yes	Perform the [Action for Non-repeatable Malfunction]. (See TROUBLESHOOTING PROCEDURE .) If DTC is displayed: Repeat the diagnosis from Step 1. If DTC is not displayed: Go to repair completion verification 2.
6		No	Go to the next step.
Repair completion verification 1	PURPOSE: VERIFY THAT VEHICLE IS REPAIRED Install/connect the part removed/disconnected during the troubleshooting procedure. Clear the DTC recorded in the memory. (See CLEARING DTC .) Replicate the vehicle conditions at the time the DTC was detected using the following procedure. Implement the repeatability verification procedure. (See REPEATABILITY VERIFICATION PROCEDURE .) Perform the DTC inspection for the connectivity master unit (CMU). (See DTC INSPECTION .) Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See MALFUNCTION DIAGNOSIS FLOW [CONTROLLER AREA NETWORK (CAN)] .) If the CAN communication is normal, perform the diagnosis from Step 1. If the malfunction recurs, replace the audio amplifier, then go to the next step. (Refer to AUDIO AMPLIFIER REMOVAL/INSTALLATION in service information.)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	PURPOSE: VERIFY IF OTHER DTCs DISPLAYED Perform the DTC inspection. (See DTC INSPECTION .) Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.