2006 Pontiac G6 GTP with Auto Hvac, no blower motor function.

Mr. Danner and I were testing this on YouTube. He then sent a message to move it here while he looked up some service info.
For those not in the loop, basically, I have my voltage where needed. If I supply a ground to that side of the motor, it spins on high. There is not
any speed control from the head unit.

Looks like you've got a 5 wire blower control module. You'll have power and ground to the module, the two motor wires, and a thinner PWM control wire from the HVAC controls. Sounds like the module has power. Have you checked it has a good ground yet? If that checks out go after the PWM signal wire. Best to check it with a 'scope. If you only have a DMM you can see if the voltage on the wire changes when you adjust blower speed.

There is a good ground, all power looks good too. The PWM stays about 4.7v not matter the control position.

Courtesy of Chad, we have the wiring diagram. :woohoo:



If you wouldn't mind? Key on, blower motor on high, backprobed at each pin, what are the voltages on each pin at the blower motor control module?

A- Ground
B- 4.72
C- D-E all have Bat V, dependent on state of charge

Chuck69 wrote: The PWM stays about 4.7v not matter the control position.

That was unexpected!!!!! It's usually the blower module.

Retest the PWM control wire unplugged just to rule out the blower module. If you still don't have PWM control work towards the HVAC controller in the dash.