Inspection Procedure

1. Disconnect the AMP 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 S14, S15 and S29 amplifier connectors.
2. Measure the resistance of the wire harness side connector.

   Standard resistance 

   RESISTANCE AND RECEIVER CONDITION SPECIFICATION
   
   

   Tester Connection	Specified Condition
   S29-6 (GND) - Body ground	Below 1 Ω
   S29-7 (GND2) - Body ground	Below 1 Ω

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

   Standard voltage 

   VOLTAGE AND RECEIVER CONDITION SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   S14-1 (+B) - S29-6 (GND)	Always	10 to 14 V
   S14-5 (+B2) - S29-6 (GND)	Always	10 to 14 V
   S15-12 (ACC) - S29-6 (GND)	Power switch ON (ACC)	10 to 14 V

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

Fig 1: Checking Wire Harness (Amplifier - 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