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 

   STANDARD RESISTANCE
   
   

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

   Fig 1: Identifying R3*1 Or R6*2 Receiver Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the voltage of the wire harness side connector.

   Standard voltage 

   STANDARD VOLTAGE
   
   

   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)M	Power switch ON (ACC)	10 to 14 V
   R6-11 (ACC)-R6-20 (GND)*2

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE