DTC B1409-7F: Rear Air Outlet 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 mode 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 outlet damper to the appropriate position, which controls the air outlet switching.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	DTC Output from	Priority	Note
B1409-7F	Rear Air Outlet Damper Control Servo Motor Actuator Stuck Off	Diagnosis Condition: Rear mode 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	Rear mode damper servo sub-assembly No. 2 air conditioning harness assembly Air conditioning radiator assembly	Does not come on	Memorized	Air Conditioner	A	-

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

DTC Output from

Priority

Note

B1409-7F

Rear Air Outlet Damper Control Servo Motor Actuator Stuck Off

Diagnosis Condition:

Rear mode 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

Rear mode damper servo sub-assembly
No. 2 air conditioning harness assembly
Air conditioning radiator assembly

Does not come on

Memorized

Air Conditioner