Inspection Procedure

1. Remove the rear A/C amplifier with the connectors still connected.
2. Turn the ignition switch ON.
3. Change the set temperature to activate the rear air mix servomotor, and measure the voltage between terminals TPR (A32-6) and SG1 (A32-9) of the rear A/C amplifier connector each time when the set temperature is changed.

   Standard voltage 

   STANDARD VOLTAGE REFERENCE
   
   

   Set Temperature	Standard Condition
   Max. cool	3.5 to 4.5 V
   Max. hot	0.5 to 1.5 V

   HINT:

   • As the set temperature increases, the voltage decreases.
   • However, if DTC 37 or 47 is displayed, check and replace the rear A/C amplifier.

OK: REPLACE REAR AIR CONDITIONING AMPLIFIER 

Fig 1: Checking Rear Air Conditioning Amplifier

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: GO TO NEXT STEP 

1. Remove the rear air mix servomotor.
2. Measure the resistance between terminals 3 and 4 of the rear air mix damper control servomotor connector.

   Standard resistance: 4.2 to 7.8 kΩ 

3. While operating the rear air mix damper control servomotor, measure the resistance between terminals PT (3) and GND (4) of the rear air mix servomotor connector.

   Standard resistance 

   STANDARD RESISTANCE REFERENCE
   
   

   Position	Standard Condition
   Max. COOL	3.6 to 6.8 kΩ
   Max. WARM	0.5 to 1.1 kΩ

   HINT:

   As the rear air mix servomotor moves from cool side to warm side, the resistance decreases.

NG: REPLACE REAR AIR MIX SERVOMOTOR ASSEMBLY 

Fig 2: Checking Rear Air Mix Damper Position Sensor

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: GO TO NEXT STEP 

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: REPLACE REAR AIR CONDITIONING AMPLIFIER