Heater Blower Motor Not Working

[lyndseynelson]

I have a 2014 Ram 2500 6.7

The blower motor is not working. I have checked the motor itself (hot wired to a battery) and it works. I have replaced the resistor. There are 12 volts at the blower connector. The relays and fuses are fine. The power at the resistor connector changes when I turn the fan speed knob.
Yet the blower will not come on. Has anyone experienced this? I am at my whits end because everything acts like it should be working, but its not.
Talked to a guy at a shop that says its the wiring harness, but I am having a hard time believing that when I am getting the proper voltage.

 

[Dodge 1500 4X4]

If you have all of the proper voltage and the resistor is good, disconnect the harness at the blower motor use some jumper pins and feed the blower with 12volts and a ground and see if the blower motor runs, It may just be a bad ground on the harness.

 

[pacofortacos]

Doesn't the newer systems use a ground system - hot fed and ground controlled to turn the fan on?
Which means you will read 12 volts but might be missing the ground - I bet if you check the 2 wires to the fan you will find you have 12 volts but no ground.

 

[jawzs2]

^^This, depending on what system you have, if it is not ATC, the ground goes through the switch

Pin Information​

Cav	Circuit	Gauge	Color	Function
1	Z910	12	BK	GROUND
2	C71	14	DB/BR	BLOWER MOTOR LOW DRIVER
3	C72	12	DB/OR	BLOWER MOTOR M1 DRIVER
4	C73	16	DB/VT	BLOWER MOTOR M2 DRIVER
5	C70	12	DB/YL	BLOWER MOTOR HIGH DRIVER

 

[jojolyle]

I have a 2014 ProMaster. My blower stopped working. I've installed a new blower and a new resistor, I have 12 V at the blower terminal when it's unplugged. It disappears when I plug the terminal back into the blower. When I take the test light to the resistor module, the blower turns on and the ac gets cold when I touch the + B terminal. I would guess a small amount of negative passing though the test light actuates the resistor module. I have reset by disconnecting the battery. I have a green indicator light on my fan switch. There is a 5 week waiting at the dealer because of hurricane Ian and that is when i got my problem. I Fan Switch? Control module? Ignition switch?

 

[konfuzed]

OK a buddy of mine is also having this issue with his 15 1500. I have a 14 1500. I went over to help him troubleshoot. His was intermittent, it would have 12v and then wouldn't. He had already bought another $200 blower motor (3 wire,with resistor built in), and everything we did was pointing towards the $300 control module. However we took apart mine and tested them, his original blower and control module are fine. now we've ruled all of the components. So it's either a software issue in his Uconnect or a wiring issue between the controls and the blower. It would be great to have a wiring diagram schematic for our trucks!

Did you ever figure out your issue?

 

[jelih]

Try this.

Dodge Ram A/C not blowing

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