Climate control panel (HVAC) is not working why?

Welcome to right turn signal or brake to light up

i was able to find a technical service bulletin that really seems to mirror what you are experiencing. However, since the unit is new, I question it. Regardless, the part may have been on the shelf awhile or the connector may be the issue. Take a look through this tsb and let me know your thoughts.

A/c control head - flashes, operates erratically
group ref: hvac

subject:
a/c control head flashes or erratic operation of a/c controls (polish terminals)

condition:

a/c control head flashes, performs erratically or malfunctions.

Cause:

light surface corrosion on the control head terminals.

Correction:

remove the a/c control head and while holding the unit with the terminal cavity down (toward the floor) so no particles will fall inside on the circuit boards, polish the terminals on both sides of the cavity with a lead pencil pink eraser. Do not use an ink eraser or other abrasive such as a small wire brush or sandpaper, etc. Doing so will remove the terminal coating and degrade the contact surface.

Performing this procedure, in many cases, will make replacing the control head unnecessary. Using this procedure in conjunction with the a/c circuit diagnosis found in the electrical diagnosis manual and especially before replacing a control head for any reason is recommended.

After polishing the control head terminals, but before reconnecting, check for proper terminal contact as described in the applicable electrical diagnosis manual. If contact is good, apply dielectric grease (p/n 12345579) to the harness connector terminals. Please do not apply grease to the control head.

Service parts information:

p/n description qty

12345579 dielectric from tube as
grease needed

parts are currently available from gmspo.

Warranty information:

for vehicles repaired under warranty, use:

labor description labor time
operation

d0362 a/c control use published
assembly labor operation
replace time

check the connections and let me know what you find. Also, , make sure to use dielectric grease in the connections.

Take care,

joe

Happy to help. Please let me know if I can help. Also, if you have the chance, make sure on the power and ground tests. Pull the plug and check those pins.

Joe

Welcome back:

It could be the control head itself. Do me a favor (don't get mad), recheck what you did. Make sure there are no pins which are bent or pushed in. Since it has made a difference, it could be something that simple.

Most likely you want to slap me for that request, but honestly, it seems like that may be the issue. Since there was a change, I feel we are on the right track. When you have it apart, inspect the wiring too. Check to make sure nothing is rubbed through or loose at the plug.

If you are confident that isn't a possibility, let me know.

Joe

It sounds like the panel is going bad but this also sounds like auto temp control

I looked up the harness for this and there are a few blower relays which I don't think are the problem. Because you say the panel doesn't light up kind makes me think the control is bad i'll send the harness diagram it cold be the relay but I kind of doubt it being electronic it's probably something is bad in the unit itself or the wires leading to it may be melted and not making contact due to age. See pics for schematic.

It sounds like the LPS fuse is out becasue that is what runs the system. Here is a guide and a wiring diagram so you can do some testing.

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

and

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check the power and ground to the controller also check the heater fuse while you are at it. Here is the fuse panel and air conditioner wiring diagrams (below)

Please let us know what happens.

Cheers

Well let's go ahead and start a new thread here: https://www.2carpros.com/questions/new

Describe everything you've done in detail. This way, as a new question, all of the experts on here will be able to easily see the new thread and reply to it. They may have pertinent experience here.

Excellent addition to this thread! Please feel free to help out whenever you are on the site :)

Thanks for the advice, Hopefully it will help someone. Thanks for using 2CarPros.
Danny-

Hello, I'm Danny
Having a fusible link is there for a reason. When circuit is overloaded that link is designed to break to save the entire system from burning out. My suggestion is to get rid of your normal wire fix and replace with a fusible link once again. Hope this helps and thanks for using 2CarPros.

Danny-