Inspection Procedure

1. Remove the clock assy with the connector still connected.
2. Turn the ignition switch to ON.
3. Measure the voltage between terminals 2 (SG) and 3 (TH+) of the clock assy connector at each temperature.
   Fig 1: Identifying Clock Assy Connectors (Manual A/C And Automatic A/C)

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   Standard: 

   at 25°C (77°F): 1.3 V 

   at 40°C (104°F): 0.8 V 

HINT:

As the temperature increases, the voltage decreases.

OK: REPLACE CLOCK ASSY (See step 4 on  REPLACEMENT  ) 

NG: Go to next step 

1. Disconnect the cooler (ambient temp. sensor) thermistor connector.
2. Measure the resistance between terminals 1 and 2 of the cooler (ambient temp. sensor) thermistor connector at each temperature.
   Fig 2: Identifying Cooler Thermistor Connector Terminals

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   Standard: 

   at 25°C (77°F): 1.6 kΩ 

   at 40°C (104°F): 0.9 kΩ 

HINT:

As the temperature increases, the resistance decreases.

NG: REPLACE COOLER (AMBIENT TEMP. SENSOR) THERMISTOR 

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR