Air Outlet Damper Position Sensor Circuit - Air Conditioning System

AIR CONDITIONING: AIR CONDITIONING SYSTEM: 33: Air Outlet Damper Position Sensor Circuit

DTC 33 - Air Outlet Damper Position Sensor Circuit

DESCRIPTION

This sensor detects the position of the air outlet damper and sends appropriate signals to the A/C amplifier. The position sensor is built into the mode damper servo sub-assembly (air outlet servo motor).









WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT AIR CONDITIONING AMPLIFIER (TPO, SG)




(a) Remove the A/C amplifier with the connectors still connected.
(b) Turn the ignition switch ON.
(c) Change the set air flow mode to activate the mode damper servo sub-assembly.
(d) Measure the voltage according to the value(s) in the table below.
Standard voltage:





HINT: As the mode damper is moved from FACE side to DEF side, the voltage decreases gradually without interruption.

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) Disconnect the connector from the mode damper servo sub-assembly.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:








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








(e) As the mode damper servo sub-assembly moves from DEF side to FACE side, the resistance decreases gradually without interruption.

HINT: For details regarding operation of the servo motor Air Outlet Damper Control Servo Motor Circuit - Air Conditioning System.

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

3. CHECK HARNESS AND CONNECTOR (AIR OUTLET DAMPER POSITION SENSOR - 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 position sensor) 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 33 is not output again.
Result:





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