Inspection Procedure

1. Remove A/C amplifier with connectors still connected.
2. Turn ignition switch ON.
3. Change the REC/FRS setting to activate the air recirculation damper servo sub-assy and measure the voltage between terminals TPI and SG-2 of A/C amplifier.

   Voltage: 

   REC: 3.5 to 4.5 V 

   FRS: 0.5 to 1.8 V 

HINT: As the recirculation damper servo sub-assy is moved from REC side to FRS side, the voltage decreases gradually without interruption.

Fig 1: Identifying Terminals TPI and SG-2 Of A/C Amplifier

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Fig 2: Identifying Inspection Procedure Chart

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B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE  PROBLEM SYMPTOMS TABLE   ) 

C: CHECK AND REPLACE HEATER CONTROL HOUSING SUB-ASSY 

A: Go to next step. 

1. Remove the recirculation damper servo sub-assy.
2. Measure resistance between terminals 1 and 2 of recirculation damper servomotor connector.

   Resistance: 4.2 to 7.8 kΩ 

3. While operating recirculation damper servo sub-assy as shown in the procedure on PRE-CHECK  , measure resistance between terminals 1 and 3 of recirculation damper servo sub-assy.

   Resistance: 

   FRS: 3.4 to 6.2 kΩ 

   REC: 0.8 to 1.6 kΩ 

HINT: As the recirculation damper servo sub-assy moves from fresh side to recirculation side, the resistance decreases gradually without interruption.

Fig 3: Measuring Resistance Between Terminals 1 And 2 Of Recirculation Damper Servomotor Connector

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Fig 4: Identifying Position Of Damper Servo Sub-Assy

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Fig 5: Identifying Graphic Of Resistance (Recirculation Damper Servo Sub-Assy)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE RECIRCULATION DAMPER SERVO SUB-ASSY 

OK: Go to next step. 

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: CHECK AND REPLACE HEATER CONTROL HOUSING SUB-ASSY