Air Conditioning System (for Automatic Air Conditioning System)

AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): B1441/41: Air Mix Damper Control Servo Motor Circuit (Passenger Side)

DTC B1441/41 - Air Mix Damper Control Servo Motor Circuit (Passenger Side)

DESCRIPTION

The air mix control servo motor sends pulse signals to indicate the damper position to the air conditioning amplifier. The air conditioning amplifier activates the motor (normal or reverse) based on these signals to move the air mix damper (front passenger side) to the appropriate position. This adjusts the amount of air passing through the heater core after passing the evaporator and controls the temperature of the blown air. The air conditioning amplifier communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness.
HINT: Confirm that there are no mechanical problems because this DTC can be set if either a damper link or the damper is mechanically locked.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG) and turn the Techstream main switch on.
(c) Select the items below in the Data List, and read the value displayed on the Techstream.

Data List / Air Conditioner





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






C -- REPLACE AIR CONDITIONING AMPLIFIER
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.
2. REPLACE AIR MIX CONTROL SERVO MOTOR
(a) Replace the air mix control servo motor.
NEXT -- Continue to next step.
3. CHECK DTC OUTPUT
(a) Clear the DTCs.
(b) Check for DTCs.
OK:
DTC B1441/41 is not output.
NG -- REPAIR OR REPLACE AIR CONDITIONING HARNESS
OK -- END (AIR MIX CONTROL SERVO MOTOR IS DEFECTIVE)