DTC B140C-7F: Rear Air Mix Damper Control Servo Motor Actuator Stuck Off [12/2023 - ]: Description
WARNING: This page is about a different car, the 2024 Lexus TX 550h+. However, it is still accessible from the selected car via links, so may be relevant.
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 air mix damper to the appropriate position, which controls the air mix switching.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | DTC Output from | Priority | Note |
|---|---|---|---|---|---|---|---|---|
| B140C-7F | Rear Air Mix Damper Control Servo Motor Actuator Stuck Off | Diagnosis Condition:
Malfunction:
Detection Time:
|
|
Does not come on | Memorized | Air Conditioner | A | - |
DTC DETECTION CONDITION COMBINATION TABLE
| 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.