Air Outlet Damper Control Servo Motor Circuit - Air Conditioning System (for Automatic Air Conditioning System)

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): B1443/43: Air Outlet Damper Control Servo Motor Circuit

DTC B1443/43 - Air Outlet Damper Control Servo Motor Circuit

DESCRIPTION

The mode damper servo 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 outlet damper to any position, which controls the air outlet switching. The A/C amplifier communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness.
HINT: Confirm that no mechanical problem is present because this DTC can be output when 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 ignition switch to ON and turn the Techstream on.
(c) Operate the MODE switch.
(d) Select the item below in the Data List, and read the display 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. INSPECT AIR OUTLET CONTROL SERVO MOTOR
(a) Replace the air outlet control servo motor Disassembly.
HINT: Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a known good one and check that the condition returns to normal.
(b) Check for DTCs.
Result:






B -- REPLACE AIR OUTLET CONTROL SERVO MOTOR
A -- Continue to next step.
3. INSPECT AIR CONDITIONING HARNESS
(a) Replace the air conditioning harness Disassembly.
HINT: Since the air conditioning harness cannot be inspected while it is removed from the vehicle, replace the air conditioning harness with a known good one and check that the condition returns to normal.
(b) Check for DTCs.
Result:






B -- REPLACE AIR CONDITIONING HARNESS
A -- REPLACE AIR CONDITIONING AMPLIFIER