Inspection Procedure

1. Disconnect the ACC fuse from the main body ECU.
2. Disconnect the AMP fuse from the engine room relay block.
3. Measure the resistance according to the value (s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   ACC fuse	Always	Below 1 Ω
   AMP fuse	Always	Below 1 Ω

NG: REPLACE FUSE 

OK: Go to next Step 

1. Disconnect the F18 and F2 amplifier connectors.
2. Measure the resistance according to the value (s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   F2-2 (GND) - Body ground	Always	Below 1 Ω
   F2-6 (GND2) - Body ground

3. Measure the voltage according to the value (s) in the table below.

   Standard Voltage 

   STANDARD VOLTAGE
   
   

   Tester Connection	Switch Condition	Specified Condition
   F2-1 (+B) - Body ground	Always	11 to 14 V
   F2-3 (+B2)(1) - Body ground
   F18-12 (ACC) - Body ground	Engine switch on (ACC)	11 to 14 V
   (1) for DVD Changer Models

Fig 1: Identifying F18 And F2 Amplifier Connectors Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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