Inspection Procedure

Preparation

1. Remove center cluster module control with connectors still connected.
2. Turn ignition switch ON.

   Check:  Change the set temperature to activate the air mix damper, and measure the voltage between terminals TP and SGTP of A/C amplifier connector each time when the set temperature is changed. If OK  , See Fig 2.

   Fig 1: Locating A/C Amplifier Terminals TP & SGTP

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   Fig 2: Voltage Specification For A/C Amplifier Terminals TP & SGTP Determined By Maximum Switch Position Selection

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   NOTE: As the set temperature increases, the voltage decreases gradually without interruption.
   1. NG: Go to step   2 . 
   2. If OK  , proceed to next circuit inspection shown on problem symptoms table. See PROBLEM SYMPTOMS TABLE . However, if DTC 31 or 41 is displayed, check and replace A/C amplifier.

PREPARATION: 

Remove air mix control servomotor. See step 2 of INSPECTION .

Check:  Measure resistance between terminals 1 and 2 of air mix control servomotor connector. If OK  , resistance : 4.2 - 7.8 kΩ.

Check:  While operating air mix control servomotor as shown in DTC 41: AIR MIX CONTROL SERVOMOTOR CIRCUIT , measure resistance between terminals 2 and 3 of air mix control servomotor connector.

Fig 3: Testing Air Mix Control Servomotor

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If OK  , see Fig 4.

Fig 4: Maximum Switch Position/Selection Specifications

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1. NG:  Replace air mix control servomotor.
2. If OK  , go to step  3.

1. NG:  Repair or replace harness or connector.
2. If OK  , check and replace A/C amplifier.