Rear Air Outlet Damper Position Sensor Circuit - Air Conditioning System (for Automatic Air Conditioning System)

AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): B1439/39: Rear Air Outlet Damper Position Sensor Circuit

DTC B1439/39 - Rear Air Outlet Damper Position Sensor Circuit

DESCRIPTION





This sensor detects the position of the rear air outlet control servo motor and sends the appropriate signals to the A/C amplifier. The position sensor is built in the rear air outlet control servo motor.
The position sensor's resistance changes as the rear air outlet control servo motor arm moves.
It outputs voltage (5 V) that is input to terminal 2 and terminal 3 via the variable resister, and then to the A/C amplifier.
The A/C amplifier determines the arm position based on the input voltage from the position sensor.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to the ON position and turn Techstream on.
(c) Select the items below in the Data List, and read the display on Techstream.

Data List / Air Conditioner:





OK:
The display is as specified in the normal condition column.
Result:






C -- REPLACE A/C AMPLIFIER
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.
2. INSPECT REAR AIR OUTLET CONTROL SERVO MOTOR





(a) Remove the rear air outlet control servo motor.
(b) Disconnect the connector from the rear air outlet control servo motor.
(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 rear air outlet control servo motor moves from FACE to FOOT, the resistance decreases gradually without interruption.
NG -- REPLACE REAR AIR OUTLET CONTROL SERVO MOTOR
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (REAR AIR OUTLET CONTROL SERVO MOTOR - A/C AMPLIFIER)





(a) Disconnect the connector from the A/C amplifier.





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






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE A/C AMPLIFIER