Air Outlet Damper Control Servo Motor Circuit - Air Conditioning System

AIR CONDITIONING: 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 mode damper position by the signals from the A/C amplifier. When the AUTO switch is on, the A/C amplifier changes the mode automatically 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) Operate the A/C control panel to enter the actuator check mode Actuator Check.
(c) Press the DEF switch to enter the step operation.
(d) Press the DEF switch, and check the air flow by hand.





OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

NG -- Continue to next step.

2. INSPECT MODE DAMPER SERVO SUB-ASSEMBLY




(a) Remove the mode damper servo sub-assembly.




(b) Connect the battery positive (+) lead to terminal 4 and the battery negative (-) lead to terminal 5, then check that the lever turns to "DEF" position smoothly.
(c) Connect the battery positive (+) lead to terminal 5 and the battery negative (-) lead to terminal 4, then check that the lever turns to "FACE" position smoothly.
OK:
Motor operates smoothly.

NG -- REPLACE MODE DAMPER SERVO SUB-ASSEMBLY
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (MODE DAMPER SERVO SUB-ASSEMBLY - A/C AMPLIFIER)
(a) Check for open and short circuit in the harness and the connector between the mode damper servo sub-assembly (air outlet damper control servo motor) and the A/C amplifier Electronic Circuit Inspection Procedure.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK DTC
(a) Start up the DTC check mode.
(b) Check that DTC 43 is not output again.
Result:





B -- SYSTEM IS OK
A -- REPLACE AIR CONDITIONING AMPLIFIER