IG Power Source Circuit: Procedure

1. Remove the A/C No. 2 fuse from the instrument panel junction block.
2. Measure the resistance of the fuse.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   A/C NO. 2 fuse	Always	Below 1 Ω

NG → REPLACE FUSE 

OK: Go to next step 

1. Install the A/C No. 2 fuse.
   Fig 1: Checking Harness And Connector (Air Conditioning Amplifier - Battery)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the D37 amplifier connector.
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   D37-1 (IG+) - Body ground	Ignition switch ON	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the D38 amplifier connector.
   Fig 2: Identifying Harness And Connector (Air Conditioning Amplifier-Body Ground)

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

   Standard resistance

   Tester Connection	Condition	Specified Condition
   D37-14 (GND) - Body ground	Always	Below 1 Ω
   D38-20 (GND2) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4