Inspection Procedure

1. Remove the air conditioning amplifier with its connectors still connected.
   Fig 1: Identifying Air Conditioning Amplifier Connector c1

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance of the wire harness side connector.

   Standard resistance 

   TERMINALS RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   c1-2 (BUS G) - Body ground	Below 1

NG: CHECK GROUND LINE AND AIR CONDITIONING AMPLIFIER 

OK: GO TO NEXT STEP. 

1. Remove the air conditioning amplifier with its connectors still connected.
2. Measure the voltage of the wire harness side connector.
   Fig 2: Identifying Air Conditioning Amplifier Connectors Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage 

   TERMINALS VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   c1-2 (BUS G) - c1-4 (B BUS)	Ignition switch ON	11 to 13 V
   c1-2 (BUS G) - c1-3 (BUS)	Ignition switch ON	Pulse generation

NG: REPLACE AIR CONDITIONING AMPLIFIER 

OK: REPLACE AIR CONDITIONING HARNESS ASSEMBLY