Diagnosis Procedure

Regarding Wiring Diagram information, refer to WIRING DIAGRAM .

1. CHECK CONTINUITY BETWEEN AV CONTROL UNIT AND ANTENNA BASE
   
   
   1. Turn ignition switch OFF.
   2. Disconnect AV control unit connector M143 and antenna base connector M502.
   3. Check continuity between AV control unit connector M143 and antenna base connector M502.

      AV control unit		Antenna base		Continuity
      Connector	Terminal	Connector	Terminal
      M143	142	M502	1	Yes

   4. Check continuity between AV control unit connector M143 and ground.

      AV control unit		Ground	Continuity
      Connector	Terminal
      M143	142	-	No

   Is the inspection result normal?

   YES 

   GO TO STEP 2  .

   NO 

   Repair or replace harness or connectors.

2. CHECK AV CONTROL UNIT VOLTAGE
   
   
   1. Connect AV control unit connector M143.
   2. Turn ignition switch ON.
   3. Check voltage between AV control unit connector M143 and ground.

      AV control unit		Ground	Voltage (Approx.)
      (+)		(-)
      Connector	Terminal
      M143	142	-	Battery voltage

   Is the inspection result normal?

   YES 

   Replace antenna base. Refer to LOCATION OF ANTENNAS .

   NO 

   Replace AV control unit. Refer to REMOVAL AND INSTALLATION - AV CONTROL UNIT .