How can i check my A/C Heat Climate Control switch?

Hi,

First, I attached the wiring schematic below for the system. This is for manual climate control. If you have something different, let me know.

First, check fuse 12 in the fuse junction box. If it is good, confirm there is power to and from it. Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If the fuse is good and there is power, go to the blend door actuator connector and locate the pink wire with a dark green tracer. Confirm it has power at the actuator with the key on.

If it does, go to the heater control unit (on the dash) and locate the dark blue wire with a red tracer. It should have 12v as well. The control unit provides a ground path. So, check for a black wire near the passenger side airbag (be careful working around the airbag). Locate the violet wire with a white tracer in the connector at the control unit and check for continuity to ground. If there is none, repair the ground. Note: The violet/white wire splices into the black ground wire. (See schematic).

If there is continuity to ground and you have power at the control unit, there is a chance the control unit has failed.

Let me know what you find or if you have other questions.

Take care,

Joe

See pics below. Note: I had to cut the schematic in half to make it readable. I did overlap them so you can follow from one to the next.

thanks for responding, i will follow your instructions tomorrow and keep you informed.
thanks again.

Happy to help. Let me know the results. I'm interested in knowing.

Take care,

Joe

Hello Joe, here is a update on what i found so far: the 12 volt fuse is good with 12 volts at
the actuator connector, the heater control unit (dark blue wire with red tracer) have o volts
with switch on, the (violet wire with a white tracer) in the connector does have continuity
to ground. so, i need to find out why dark blue wire with red tracer have o volts.

Hi,

Good job checking. At this point, either the controller is bad, or the blue/red wire is open. When you checked that wire for power, did you do it at the actuator or the control module?

If at the actuator, disconnect it and check right at the pin or back probe the blue/red wire right at the module to see if it is providing power.

Let me know the results.

Hi Joe,

i check the blue/red wire right at the module, and no power, and i check the blue/red wire right at the actuator connection pin and no power, but i do have power at the green/pink wire at the module selector switch. question? so does the green/pink wire supply power into the module selector switch? Does the selector switch send power to the actuator? when i connect the actuator and turn the switch the actuator moves in one direction, and when i turn it in the opposite direction no movement, could it be a bad selector switch?

Hi,

The dark green/pink supplies power directly to the controller. Power can also be introduced via the blue/red wire in the opposite direction to turn the actuator motor in the opposite direction.

So based on your description, it works one way but not the other. Are you getting power at the pink/dark green wire at the actuator? Power is supplied to that wire via the same fuse dark green/pink wire but through a different wire to the actuator.

If you are not getting power to the pink/dark green wire, that is why it won't go the opposite direction.

Let me know

Joe

See pic.

yes, i am getting power to the pink/dark green wire to the actuator.

Okay, then either there is no power out from the actuator to the controller, the ground is bad, or the controller is bad.

If I recall, you checked the ground. Also, when you tested for power at the blue/red wire out from the actuator, did you provide your own ground? If you did and there was no power, it sounds like the problem is at the connector on the actuator. The controller provides a ground path for that wire to complete the circuit. Providing a knowing good ground and testing at the actuator, you should see power. So, inspect the wiring very closely and the connector as well.

Now, if you provide a knowing good ground and there is power, the controller is the likely cause.

Joe

Okay, i think i will order a controller, i will let you know in a week or so when i get it. thanks Joe for the info.

You are very welcome. Just make sure power stops at the controller and there isn't a wiring issue. I don't want you to spend the money if it is something different.

Take care and let me know how things turn out.

Joe

Hello Joe, just getting back to you with some good news, i received my new controller Wednesday and after installing it on Thursday, everything is working again, so the old controller was getting power to it, but not supplying power to the dark blue/red wire to the actuator. the new controller fixed the problem. Once again (Thanks for all the help) i can ride cool again.
edwoosr667

Hi,

Thanks for the update. I'm glad you got it working.

Please feel free to come back anytime in the future if you have questions.

Take care,

Joe