1.CHECK CONTINUITY BETWEEN AV CONTROL UNIT AND BOSE AMP.

1. Turn ignition switch OFF.
2. Disconnect BOSE amp. connector and AV control unit connector.
3. Check continuity between AV control unit harness connector and BOSE amp. harness connector.

   AV control unit | BOSE amp. | Continuity
   Connector | Terminals | Connector | Terminals
   M201 | 1 | B17 | 31 | Existed

4. Check continuity between AV control unit harness connector and ground.

   AV control unit | Ground | Continuity
   Connector | Terminals
   M201 | 1 | Not existed

Is the inspection result normal?
YES>>GO TO 2.
NO>>Repair harness or connector.
2.CHECK VOLTAGE AV CONTEROL UNIT

1. Connect AV control unit connector.
2. Turn ignition switch ON.
3. Check voltage between AV control unit harness connector and ground.

   (+) | (–) | Voltage (Approx.)
   AV control unit
   Connector | Terminals
   M201 | 1 | Ground | 12.0 V

Is the inspection result normal?
YES>>Replace BOSE amp. Refer to Removal and Installation .
NO>>Replace AV control unit. Refer to Removal and Installation.