Inspection Procedure

1. Disconnect the stereo component amplifier connectors.
2. Measure the resistance according to the values in the table below.

   Standard resistance 

   STANDARD RESISTANCE
   
   

   Tester connection	Condition	Specified condition
   GND - Body ground	Always	Below 1 Ω
   GND2 - Body ground (*2)	Always	Below 1 Ω

3. Measure the voltage according to the values in the table below.

   Standard voltage 

   STANDARD VOLTAGE
   
   

   Tester connection	Condition	Specified condition
   B+ - GND ((1))	Always	10 to 14 V
   +B - GND ((2))	Always	10 to 14 V
   +B2 - GND ((2))	Always	10 to 14 V
   ACC - GND	Ignition switch in the ACC position	10 to 14 V
   (1) with Front Center Speaker (2) without Front Center Speaker

Fig 1: Identifying Stereo Component 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