Inspection Procedure

Fig 1: Checking A/C Control Assembly Connector Voltage

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

PREPARATION: 

1. Remove A/C control assembly with connectors still connected see AIR CONDITIONING .
2. Turn ignition switch to ON.

1. CHECK: 
2. Check voltage between terminals TAM and SG of A/C control assembly connector at each temperature.

1. OK: 
   1. Voltage 
   2. at 25°C (77°F): 1.35-1.75 V 
   3. at 40°C (104°F) : 0.85 - 1.25 V 

HINT:

As the temperature increases, the voltage decreases.

1. NG: Go to step 2 

1. OK: Proceed to the next circuit inspection shown on problem symptoms table see  PROBLEM SYMPTOMS TABLE  . However, if DTC 12 is displayed, check and replace A/C control assembly. 

Fig 2: Checking Ambient Temperature Sensor Resistance
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. PREPARATION: 
2. Disconnect ambient temperature sensor connector.
3. CHECK: 
4. Check resistance between terminals 1 and 2 of ambient temperature sensor connector at each temperature.

1. OK: 
   1. Resistance 
   2. at 25°C (77°F): 1.6-1.8 k/ohms 
   3. at 40°C (104°F): 0.5-0.7 ohms 

HINT:

As the temperature increase, the resistance decrease.

1. NG: Replace ambient temperature sensor. 
2. OK: Go to next step 

1. NG: Repair or replace harness or connector. 
2. OK: Check and replace A/C control assembly.