Inspection Procedure

WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

Actuator check.
Preparation
1. Warm up the engine.
2. Set to the actuator check mode. See 5.
  Check: Operate the temperature control switch and check the operation of the air mix damper and the condition of the blower. If OK , see Fig 1.
  
  Fig 1: Air Temperature Specifications During Actuator Check Mode
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. If OK , proceed to next circuit inspection shown on problem symptoms table. See PROBLEM SYMPTOMS TABLE .
2. NG: Go to step 2 .
Check air mix control servomotor.
PREPARATION: Remove air mix control servomotor. See step 2 of INSPECTION .

Check: Connect positive (+) lead to terminal 4 and the negative (-) lead to terminal 5. If OK , the lever turns smoothly to COOL side.

Fig 2: Testing Air Mix Control Servomotor (1 Of 2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check: Connect negative (-) lead to terminal 4 and positive (+) lead to terminal 5. If OK , the lever turns smoothly to WARM side.

Fig 3: Testing Air Mix Control Servomotor (2 Of 2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Replace air mix control servomotor.
2. OK: Go to step 3 .
Check harness and connector between A/C amplifier and air mix control servomotor . See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION .
1. NG: Repair or replace harness or connector.
2. If OK , check and replace A/C amplifier.