DTC B1403-7F: Front Air Outlet Damper Control Servo Motor Actuator Stuck Off [11/2021 - ]: Procedure
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2025 Lexus NX 350, 2025 Lexus NX 250, 2024 Lexus NX 350, 2024 Lexus NX 250, and 2023 Lexus NX 350. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION)
- Check that the No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.
Refer to REASSEMBLY [11/2021 - ]
OK
No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.
Result
Proceed to OK NG
Result:
NG
REINSTALL NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY. Refer to REASSEMBLY [11/2021 - ]
Result:
OK
See step 2
- Check that the No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.
- CHECK NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (MOTOR, LINK, DAMPER)
- Check for a wire harness caught between the links of the motors and dampers.
OK
No wire harnesses are caught between the links of the motors and dampers.
Result
Proceed to OK NG
Result:
NG
REMOVE PINCHED WIRE HARNESS
Result:
OK
See step 3
- Check for a wire harness caught between the links of the motors and dampers.
- CHECK AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER)
- Remove the No. 1 air conditioning radiator damper servo sub-assembly.
Refer to DISASSEMBLY [11/2021 - ]
- Operate the dampers by hand.
OK
The dampers are easily operated by hand.
Result
Proceed to OK NG
Result:
OK
REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY. Refer to REASSEMBLY [11/2021 - ]
Result:
NG
REPAIR OR REPLACE AIR CONDITIONING RADIATOR ASSEMBLY. Refer to REMOVAL [11/2021 - 03/2022] , or refer to REMOVAL [03/2022 - ]
- Remove the No. 1 air conditioning radiator damper servo sub-assembly.