Radio Receiver Power Source Circuit: Procedure

1. Remove the RADIO NO. 1 fuse from the engine room No. 1 relay block.
2. Remove the RADIO NO. 2 fuse from the passenger side junction block.
3. Remove the AM1 fuse from the driver side junction block.
4. Measure the resistance of the fuses.

   Standard resistance

   Below 1 Ω

NG → REPLACE FUSE 

OK: Go to next step 

1. Disconnect the R3 receiver connector.
   Fig 1: Identifying R3 Receiver Connectors

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

   Standard voltage

   Standard resistance 

   Tester Connection	Condition	Specified Condition
   R3-1 (+B) - Body ground	Always	10 to 14 V
   R3-11 (ACC) - Body ground	Ignition switch ACC	10 to 14 V

   Tester Connection	Specified Condition
   R3-20 (GND) - Body ground	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

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