Diagnostic Procedure

Step	INSPECTION		Action
1	CONFIRM PCM DTC Perform the PCM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZR 2.5] .) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR 2.5] .)
1		No	Go to the next step.
2	INSPECT BATTERY Inspect the battery. (See BATTERY INSPECTION [MZR 2.5] .) Is there any malfunction?	Yes	Recharge or replace the battery, then go to Step 6. (See BATTERY RECHARGING [MZR 2.5] .) (See BATTERY REMOVAL/INSTALLATION [MZR 2.5] .)
2		No	Go to the next step.
3	INSPECT GENERATOR Inspect the generator. (See GENERATOR INSPECTION [MZR 2.5] .) Is there any malfunction?	Yes	Replace the generator, then go to Step 6. (See GENERATOR REMOVAL/INSTALLATION [MZR 2.5] .)
3		No	Go to the next step.
4	INSPECT AUDIO UNIT CONNECTOR CONDITION Switch the ignition OFF (LOCK). Disconnect the negative battery cable. Disconnect the audio unit connector. Inspect the connector for poor connection (such as damaged/pulled-out pins, and corrosion). Is there any malfunction?	Yes	Repair or replace the connector or terminal, then go to Step 6.
4		No	Go to the next step.
5	INSPECT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND Audio unit connector is disconnected. Reconnect the negative battery cable. Switch the ignition to ACC. Measure the voltage at the following terminals (wiring harness-side): Audio unit terminal 1B Audio unit terminal 1R Is the voltage B+ ?	Yes	Go to the next step.
5		No	If the audio unit terminal 1B or 1R voltage is not B+ : Inspect the ROOM 15 A fuse or MIRROR 7.5 A fuse. If the fuse is blown: Repair or replace the wiring harness for a possible short to ground. Replace the malfunctioning fuse. If the fuse is deteriorated: Replace the malfunctioning fuse. If the fuse is normal: Repair or replace the wiring harness for a possible open circuit. Go to the next Step.
6	VERIFY TROUBLESHOOTING COMPLETED Switch the ignition OFF (LOCK). Make sure reconnect the disconnected connectors. Reconnect the negative battery cable. Clear the DTC from the audio unit memory. (See CLEARING DTC [AUDIO] .) Perform the audio unit DTC inspection. (See DTC INSPECTION [AUDIO] .) Is the same DTC present?	Yes	Replace the audio unit, then go to the next step. (See AUDIO UNIT REMOVAL/INSTALLATION .)
6		No	Go to the next step.
7	VERIFY THAT NO OTHER DTCs ARE RECORDED Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [AUDIO] .)
7		No	DTC troubleshooting completed.