B1446

AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1446/46: Air Mix Damper Control Servo Motor Circuit (Driver Side)

DTC B1446/46 - Air Mix Damper Control Servo Motor Circuit (Driver Side)

DESCRIPTION

The air mix damper servo (for driver side HOT) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the air mix damper (for driver side HOT) to any position. As a result, the amount of air that has passed through the evaporator and is passing through the heater core is adjusted, and the temperature of the air blowing toward the driver side is controlled.
HINT: Confirm that no mechanical problem is present because this diagnostic code can be output when either a damper link or damper is mechanically locked.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING INTELLIGENT TESTER OR TECHSTREAM (AIR MIX SERVO MOTOR TARGET PULSE (for Driver Side HOT))
(a) Use the Data List to check if the servo motor is functioning properly.
(1) Intelligent tester

AIR CONDITIONER





(2) Techstream

Air conditioner





OK:
The display is as specified in the normal condition.
NG -- REPLACE AIR MIX SERVO MOTOR (for Driver Side HOT)
OK -- REPLACE AIR CONDITIONING AMPLIFIER
2. REPLACE AIR MIX SERVO MOTOR (for Driver Side HOT)
(a) Replace the air mix servo motor Disassembly.
HINT: Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a normal one.

NEXT -- Continue to next step.
3. RECHECK DTC
(a) Clear the DTCs DTC Check / Clear.
(b) Check for DTCs DTC Check / Clear.
OK:
DTC B1446 is not output.
NG -- REPLACE AIR CONDITIONING HARNESS
OK -- END (AIR MIX SERVO MOTOR (for Driver Side HOT) IS DEFECTIVE)