Heating and Air Conditioning

DTC B1605, B1675, B1676, B1677
Control module fault, stepping motor driver stage, air distributor, recirculation flap and air-blending flap.

Fault Symptom.
B1675, B1676 and B1677 can be caused by a fault in the relevant flap motor. First carry out fault diagnosis on the respective flap motor. The driver stage is mounted inside the ACC control module and cannot be changed separately.

Conditions
B1605: Control module fault.
B1675: Driver stage, air distribution flap.
B1676: Driver stage, recirculation flap.
B1677: Driver stage, air blending flap.

Diagnostic procedure
1. Clear the trouble code and check that it is generated afresh before starting on point 2.
2. Carry out fault diagnosis on the relevant flap motor. This should be done even if no such trouble code is generated.
- Stepping motor for air distributor.
B2402
- Stepping motor for air blending flap.
B2492
- DC motor for recirculation flap.
B2413
3. Proceed to "Before Changing A Control Module". Testing and Inspection