Inspection Procedure

Preparation: 

Remove integration control and panel with connectors still connected.

Check: 

1. Turn ignition switch to ON.
2. Press REC/FRS switch to change air inlet between fresh and recirculation air, and measure voltage between terminals TPI and SG-4 of integration control and panel when the air inlet damper control servomotor operates.

OK: 

Fig 1: REC/FRS Switch Voltage Specifications

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Locating Integration Control And Panel TPI & SG-4 terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

As the air inlet damper control servomotor is moved form REC side to FRS side, the voltage decreases.

1. NG: Go to step 2. 
2. OK: Proceed to next circuit inspection shown on problem symptoms table. See  PROBLEM SYMPTOMS TABLE  . However, if DTC 32 or 42 is displayed, check and replace integration control and panel. 

Preparation: 

Remove AIR MIX SERVOMOTOR .

Check: 

Measure resistance between terminals 3 and 2 of air inlet damper control servomotor assembly connector.

OK: 

Resistance: 4.2 - 7.8 kΩ  .

Check: 

While operating air inlet damper control servomotor, following this procedure, see DTC 42 AIR INLET DAMPER CONTROL SERVOMOTOR CIRCUIT , measure resistance between terminals 3 and 2 of air inlet damper control servomotor assembly connector.

OK: 

Resistance 

1. NG: Replace air inlet damper control servomotor assembly. 
2. OK: Go to next step. 

1. NG: Repair or replace harness or connector. 
2. OK: Check and replace integration control and panel.