DTC B1446: Air Mix Damper Control Servo Motor Circuit (Driver Side) [02/2019 - 08/2020]: Description
The No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) 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 (driver side air mix) 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 a 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) |
|
|
Memorized |
| Vehicle Condition | |||
|---|---|---|---|
| Pattern 1 | Pattern 2 | ||
| Diagnosis Condition | During No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) operation | ◦ | ◦ |
| Malfunction Status | The damper servo operation request signal is output but the position information of the servo does not change | ◦ | - |
| The damper servo operation request signal is output but the position information of the servo is malfunctioning | - | ◦ | |
| Detection Time | Continuously for 30 seconds or more | Continuously for 30 seconds or more | |
| Trip Count | 1 trip | 1 trip | |
HINT:
If the conditions match either of these patterns, a DTC will be output.