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

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

   AV control unit | Antenna amp. | Continuity
   Connector | Terminals | Connector | Terminals
   M371 | 134 | M386 | 1 | Existed

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

   AV control unit | Ground | Continuity
   Connector | Terminals
   M371 | 134 | 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
   M371 | 134 | Ground | 12.0 V

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