Inspection Procedure

Fig 1: Identifying Hazard Warning Switch Connector Terminals

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1. Remove the A/C control.
2. Measure the resistance of the A/C control.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Switch Condition	Specified Condition
   A9-12 - A10-14	Hazard warning switch ON	Below 1 Ω
   A9-12 - A10-14	Hazard warning switch OFF	10 kΩ or higher

NG: REPLACE A/C CONTROL ASSEMBLY 

OK: Go to Next step 

Fig 2: Identifying A/C Control Assembly And Driver Side Junction Block ECU Connector Terminals

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1. Disconnect the A9 and A10 A/C control connectors.
2. Disconnect the D4 ECU connector.
3. Measure the resistance of the Identifying harness side connectors.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   A9-12 - D4-2 (HAZ)	Below 1 Ω
   A10-14 - Body ground	Below 1 Ω
   A9-12 - Body ground	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: Go to Next step 

1. Disconnect the 2D junction block connector.
   Fig 3: Identifying 2D Junction Block Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage of the wire harness side connectors.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   2D-3 (HAZ) - Body ground	10 to 14 V

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

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