DTC B1446: Air Mix Damper Control Servo Motor Circuit (Driver Side) [12/2019 - 10/2022]: Description
The No. 1 air conditioning radiator 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 No. 1 air conditioning radiator damper servo sub-assembly to the appropriate position.
As a result, the amount of air passing through the heater core after passing through the evaporator is adjusted, and the temperature of the air blowing toward the driver side is controlled.
The air conditioning amplifier assembly communicates with the servo through the communication/driver IC and wiring assembly called the air conditioning harness assembly.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Memory |
|---|---|---|---|---|
| B1446 | Air Mix Damper Control Servo Motor Circuit (Driver Side) | Air mix damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 air conditioning radiator 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 | No. 1 air conditioning radiator 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.