Stereo Component Amplifier Power Source Circuit: Procedure

1. Disconnect the AMP fuse from the engine room No. 1 relay block.
2. Disconnect the ACC fuse from the instrument panel 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 L13, L14 and L15 amplifier connectors.
   Fig 1: Checking Harness And Connector (Stereo Component Amplifier - Battery And Connector)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage and resistance according to the value(s) in the table below.

   Standard Voltage

   Standard Resistance 

   Tester Connection	Switch Condition	Specified Condition
   L13-12 (ACC) - Body ground	Ignition switch ACC	11 to 14 V
   L15-1 (+B) - Body ground	Always	11 to 14 V
   L15-5 (+B2) - Body ground	Always	11 to 14 V

   Tester Connection	Specified Condition
   L14-7 (GND2) - Body ground	Below 1 Ω
   L14-6 (GND) - Body ground	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

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