Inspection Procedure

1. Disconnect the DOME fuse from the engine room junction block.
2. Disconnect the ACC fuse from the driver side junction block.
3. Measure the resistance of the fuses.

   Standard resistance: 

   Below 1 Ω 

NG : REPLACE FUSE 

OK : GO TO NEXT STEP 

1. Disconnect the R3^* 1 or R6^* 2 receiver connector.

   HINT:

   • ^* 1: for 6 speaker system
   • ^* 2: for 9 speaker system
2. Measure the resistance of the wire harness side connector.

   Standard resistance 

   RESISTANCE AND RECEIVER CONDITION SPECIFICATION
   
   

   Tester Connection	Specified Condition
   R3--7 (GND) - Body ground* 1	Below 1 Ω
   R6--20 (GND) - Body ground* 2

3. Measure the voltage of the wire harness side connector.

   Standard voltage 

   VOLTAGE AND RECEIVER CONDITION SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   R3--4 (+B) - R3--7 (GND)* 1	Always	10 to 14 V
   R6-1 (+B) - R6--20 (GND)* 2
   R3-3 (ACC) - R3--7 (GND)* 1	Power switch ON (ACC)	10 to 14 V
   R6--11 (ACC) - R6--20 (GND)* 2

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

Fig 1: Checking Wire Harness (Receiver - Battery And Body Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : GO TO NEXT STEP 

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE