Air Mix Damper Position Sensor Circuit (Driver Side) - Air Conditioning System (for Automatic Air Conditioning System)

AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): B1436/36: Air Mix Damper Position Sensor Circuit (Driver Side)

DTC B1436/36 - Air Mix Damper Position Sensor Circuit (Driver Side)

DESCRIPTION





This sensor detects the position of the air mix control servo motor (air outlet damper) and sends the appropriate signals to the A/C amplifier. The position sensor is built in the air mix control servo motor. The position sensor resistance changes as the air mix control servo motor arm moves.
It outputs voltage (5 V) that is input to terminal 1 and terminal 3 via the variable resistor, 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 AIR MIX CONTROL SERVO MOTOR




(a) Remove the air mix control servo motor.
(b) Disconnect the connector from the air mix 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 air mix control servo motor moves from the COOL side to the HOT side, the resistance decreases gradually without interruption.
NG -- REPLACE AIR MIX CONTROL SERVO MOTOR
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (AIR MIX 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