DTC B1447: Air Mix Damper Control Servo Motor Circuit (Rear) [12/2019 - 11/2023]: Description
The rear air mix damper servo sub-assembly 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 these signals to move the rear air mix damper servo sub-assembly 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 output air.
The air conditioning amplifier assembly communicates with the servo through the communication/driver IC and wiring assembly called the No. 2 air conditioning harness assembly.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Memory |
|---|---|---|---|---|
| B1447 | Air Mix Damper Control Servo Motor Circuit (Rear) | Air mix damper position sensor value does not change even if air conditioning amplifier assembly operates rear air mix damper servo sub-assembly |
|
Memorized (30 sec. or more)* |
*: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.
| Vehicle Condition | |||
|---|---|---|---|
| Pattern 1 | Pattern 2 | ||
| Diagnosis Condition | Rear air mix damper servo sub-assembly operating | ◦ | ◦ |
| Malfunction | Damper servo operation request signals are output but the damper position sensor value does not change | ◦ | - |
| Damper servo operation request signals are output but the damper position sensor value is abnormal | - | ◦ | |
| Detection Time | Continuously for 30 seconds or more | Continuously for 30 seconds or more | |
| Trip Count | 1 trip | 1 trip | |
HINT:
If the conditions of either of these patterns are detected, a DTC will be stored.