Inspection Procedure

1. Remove the A/C (HTR) fuse from the driver side junction block.
2. Measure the resistance of the fuse.

   Standard resistance: Below 1 Ω 

NG : REPLACE FUSE 

OK : GO TO NEXT STEP 

1. Remove the air conditioning amplifier with connectors still connected.
2. Measure the voltage of the wire harness side connector.

   Standard voltage 

   TERMINALS VOLTAGE SPECIFICATIONS
   
   

   Tester Connection	Condition	Specified Condition
   A8-5 (IG) - A8-1 (GND)	Power switch ON (IG)	10 to 14 V

NG : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

Fig 1: Identifying Air Conditioning Amplifier Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : GO TO NEXT STEP 

1. Measure the voltage of the wire harness side connector.

   Standard voltage 

   TERMINALS VOLTAGE SPECIFICATIONS
   
   

   Tester Connection	Condition	Specified Condition
   A8-5 (IG) - Body ground	Power switch ON (IG)	10 to 14 V

2. Measure the resistance of the wire harness side connector.

   Standard resistance 

   TERMINALS RESISTANCE SPECIFICATIONS
   
   

   Tester Connection	Specified Condition
   A8-1 (GND) - Body ground	Below 1 Ω

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

Fig 2: Disconnecting A8 Amplifier Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : REPLACE AIR CONDITIONING AMPLIFIER