Inspection Procedure

1. Preparation: 
   1. Remove A/C control assembly with connectors still connected, see AIR CONDITIONING SYSTEM .
   2. Turn ignition switch to on.
      Fig 1: Checking A/C Control Assembly Connector Voltage

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

1. OK: 
   1. At 25°C (77°F): 1.8-2.2 V 
   2. At 40°C (104°F): 1.2-1.6 V 

Hint:

As the temperature increases, the voltage decreases.

1. Go To Step 2 

1. OK: Proceed to next circuit inspection shown on problem symptoms table see  CIRCUIT INSPECTION  . However, if DTC 11 is displayed, check and replace A/C Control Assembly. 

1. PREPARATION: 
   1. Remove room temperature sensor from lower No. 1 Panel, see AIR CONDITIONING SYSTEM .
   2. Disconnect room temperature sensor connector.
      Fig 2: Checking Resistance Between Terminals 1 & 2

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. CHECK K/ohms: 
2. Check resistance between terminals 1 and 2 of room temperature sensor connector at each temperature.

1. OK: 
   1. At 25°C (77°F): 1.6-1.8 k/ohms 
   2. At 40°C (104°F): 0.5-1.7 k/ohms 

Hint:

As the temperature increases, the resistance decreases.

1. NG: Replace room 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.