DTC B1402-87: Lost Communication with Front Air Outlet Damper Control Servo Motor LIN Missing Message [10/2022 - ]: Description
WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.
The air conditioning harness assembly connects the air conditioning amplifier assembly and No. 1 air conditioning radiator damper servo sub-assembly.
The No. 1 air conditioning radiator damper servo sub-assembly sends damper position information to the air conditioning amplifier assembly.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Memory | DTC Output from | Priority |
|---|---|---|---|---|---|---|
| B1402-87 | Lost Communication with Front Air Outlet Damper Control Servo Motor LIN Missing Message | Diagnosis Condition:
Malfunction:
Detection Time:
|
No. 1 air conditioning radiator damper servo sub-assembly | Memorized | Air Conditioner | B |
DTC DETECTION CONDITION COMBINATION TABLE
| Vehicle Condition | |||
|---|---|---|---|
| Pattern 1 | Pattern 2 | ||
| Diagnosis Condition | Ignition switch ON | ◦ | ◦ |
| Malfunction | Error in communication line between air conditioning amplifier assembly and No. 1 air conditioning radiator damper servo sub-assembly | ◦ | - |
| Open in communication line between air conditioning amplifier assembly and No. 1 air conditioning radiator damper servo sub-assembly | - | ◦ | |
| Detection Time | Continuously for 10 seconds or more | Continuously for 10 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.