B1446
HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1446/46: Air Mix Damper Control Servo Motor Circuit (Driver Side)
B1446/46 - Air Mix Damper Control Servo Motor Circuit (Driver Side)
DESCRIPTION
The No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix damper servo) sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on the signals to move the air mix damper (for driver side) to any position. As a result, the air mix damper (for driver side) varies the mixture of hot air from the heater core and cold air from the evaporator so that the temperature of the air blowing toward the front passenger side is as requested.
HINT
Confirm that no mechanical problem is present because this trouble code may be stored when either a damper link or damper is mechanically locked.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. READ VALUE USING TECHSTREAM (DRIVER SIDE AIR MIX DAMPER SERVO)
(a) Use the Data List to check if the No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix damper servo) is functioning properly Scan Tool Testing and Procedures.
Air Conditioner
OK:
The display is as specified in the normal condition column.
Result
C -- PERFORM ACTIVE TEST USING TECHSTREAM (DRIVER SIDE AIR MIX DAMPER SERVO)
B -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal
A -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures
2. PERFORM ACTIVE TEST USING TECHSTREAM (DRIVER SIDE AIR MIX DAMPER SERVO)
(a) Select the Active Test, use the Techstream to generate a control command, and then check that the No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix damper servo) operates Scan Tool Testing and Procedures.
Air Conditioner
OK:
No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix damper servo) operates normally.
NG -- REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (DRIVER SIDE AIR MIX DAMPER SERVO)
OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal
3. REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (DRIVER SIDE AIR MIX DAMPER SERVO)
(a) Replace the No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix damper servo) Disassembly.
HINT
Since the No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix damper servo) cannot be inspected while it is removed from the vehicle, replace the No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix damper servo) with a new or normally functioning one.
NEXT -- Continue to next step.
4. CHECK FOR DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC B1446 is not output.
NG -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
OK -- END (NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [DRIVER SIDE AIR MIX DAMPER SERVO] IS FAULTY)
5. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
(a) Temporarily replace the air conditioning amplifier assembly with a new or normally functioning one Removal.
NEXT -- Continue to next step.
6. CHECK FOR DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC B1446 is not output.
NG -- REPLACE AIR CONDITIONING HARNESS ASSEMBLY Disassembly
OK -- END (AIR CONDITIONING AMPLIFIER ASSEMBLY IS FAULTY)