Automatic Air Conditioning System

AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): 41: Air Mix Damper Control Servo Motor Circuit (Passenger Side)

DTC 41 - Air Mix Damper Control Servo Motor Circuit (Passenger Side)

DESCRIPTION

The air mix control servo motor (air mix damper servo sub-assembly) is controlled by the A/C amplifier. Air flow temperature changes when moving the air mix damper to the target point. The target point can be detected with the air mix damper position sensor.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTUATOR CHECK
(a) Set the actuator check mode (Actuator Check).
(b) Press the DEF switch to change to the step operation.
(c) Check the air flow temperature by hand.





OK:
Air flow temperature changes in accordance with each display code.
Result:





C -- REPLACE AIR CONDITIONING AMPLIFIER
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.
2. INSPECT AIR MIX CONTROL SERVO MOTOR (AIR MIX DAMPER SERVO SUB-ASSEMBLY)





(a) Remove the air mix control servo motor (air mix damper servo sub-assembly).
(b) Connect the positive (+) lead from the battery to terminal A19-5 (MH) and negative (-) lead to terminal A19-4 (MC), then check that the lever turns to the "MAX. HOT" position smoothly.
(c) Connect the positive (+) lead from the battery to terminal A19-4 (MC) and negative (-) lead to terminal A19-5 (MH), then check that the lever turns to the "MAX. COOL" position smoothly.
NG -- REPLACE AIR MIX CONTROL SERVO MOTOR
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (AIR MIX CONTROL SERVO MOTOR - AIR CONDITIONING AMPLIFIER)





(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE AIR CONDITIONING AMPLIFIER