chedeng1152

I have a 2005 S430 4Matic benz. I need help to diagnose the problem.
My car has no cold air coming out of the vent. The ac is on but the blower motor is off. I know my ac compressor is good because I can see the condensing pipe has some codensation. I tried to diagnose with my iCarsoft multi-system scanner i980 and I have the following fault codes
B1451 M16/17 Left center vent diverter flap actuator motor
B1452 M16/19 Left center vent temperature regulating flap actuator motor
B1453 M1621 Fresh air and recirculated air flap actuator motor
B1455 M16/13 Left defrostor nozzle flap actuator motor
B1456 M16/14 Right defroster nozzle flap actuator motor
B1458 M16/16 Right footwell flap actuator motor

Will it be the Electronic stepper motor control module? According to the wiring diagram all the actuator motors are connected to stepper module.

Can anyone tell me what is causing why my ac is not blowing cold air?
Any help is very much appreciated.

Thanks

Plutoe

sure makes sense to me!!

chedeng1152

You mean the electronic stepper motor control module is bad?

chedeng1152

Here is the wiring diagram.
​​​​​​​