Automatic Air Conditioning System

AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): 43: Air Outlet Damper Control Servo Motor Circuit

DTC 43 - Air Outlet Damper Control Servo Motor Circuit

DESCRIPTION

This circuit turns the servo motor and changes each damper position by receiving the signals from the A/C amplifier assembly. When the AUTO switch is on, the A/C amplifier changes the mode between "FACE", "BI-LEVEL" and "FOOT" according to the temperature setting.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

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





OK:
Air flow position 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 OUTLET CONTROL SERVO MOTOR (MODE DAMPER SERVO SUB-ASSEMBLY)





(a) Remove the air outlet control servo motor (mode damper servo sub-assembly).
(b) Connect the positive (+) lead from the battery to terminal A20-4 (MDEF) and negative (-) lead to terminal A20-5 (MFACE), then check that the lever turns to the "DEF" position smoothly.
(c) Connect the positive (+) lead from the battery to terminal A20-5 (MFACE) and negative (-) lead to terminal A20-4 (MDEF), then check that the lever turns to the "FACE" position smoothly.
NG -- REPLACE AIR OUTLET CONTROL SERVO MOTOR
OK -- Continue to next step.
3. CHECK AND REPLACE HARNESS AND CONNECTOR (AIR OUTLET 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