If it's not one thing, it's another...

[SolidusJ]

Decided to replace the light that went bad in my AC control unit. Take it apart, that's odd, it's not bad. Put everything back together and the 3 orange lights are not cycling?

So now I can't control my temperature or air direction. Add insult to injury, my radio isn't coming on. Which is blowing my mind seeing how I have that going to a different power source with relay.

I know the radio is getting power because the power wire is good and fues on the radio good. The trans temp gauge is getting power also, that's why I have a relay inline for the radio.

I tried manually to sync the AC controller to the truck and nothing. The T is sitting now with the battery disconnected.

Oh yeah, all the fuses under the hood are good.

 

[SolidusJ]

Side note, all the circuits and solder points in the AC control are good. Nothing broken or out of place. Plus, only the speep control knob light works lol

 

[JPaul]

Did you try unplugging it and plugging it back in again? Might be a bad contact or something. Also check any other connections back there that might have come undone or anything.

Sent from my SM-N975U using Tapatalk

 

[SolidusJ]

Did you try unplugging it and plugging it back in again? Might be a bad contact or something. Also check any other connections back there that might have come undone or anything.

Sent from my SM-N975U using Tapatalk

Quite a few times and I insured all the pins in the harness were properly seated.

 

[SolidusJ]

Well... At least the lights work...


I feel the wiring is in good shape.

 

[SolidusJ]

There's an H3 at the pick and pull yard, I had the center dash panel with everything on it in my hand but left it behind. Hopefully it's still there tomorrow and we'll see what happens when I swap the AC controller.

 

[alrock]

I think your wiring is too clean. It should look like a bird's nest in there but there's some superhuman, unnatural tidiness to your wiring below the HVAC controls.

 

[3Hummers]

Looks like you dusted.

 

[Roastbeast]

Had this happen before. Unplugged everything and plugged back in and it worked. One time it was blinking in and out and I just unplugged and re plugged in also. Few radio swaps and ran into this

 

[SolidusJ]

I think your wiring is too clean. It should look like a bird's nest in there but there's some superhuman, unnatural tidiness to your wiring below the HVAC controls.

I'll snap a few pictures of all the other things I did back there. Needless to say, OCD can be a real b!tich some times lol

 

[SolidusJ]

Well, junk yard was a bust so I ordered a new control unit, should be in next week. Now to solve the radio issue, I might have a lead on what's going on.

Pioneer requires a power signal power on and then off, back on to watch videos. Rather than doing the legal thing and using the emergency brake signal, I just tapped into the defrost button. That's the only thing that links the radio to the AC control.

Some shots of what's behind the dash.

 

[SolidusJ]

Seems like constant power (yellow memory) has zero power going to it. No idea how this would matter any with the AC control unit not working.

 

[Jeepwalker]

Did you perform the tried and true method of unhooking the battery and draining the PCM power overnight?

Did you remove the fuses and check them, also for power? Sometimes fuses can 'look' good, but be internally corroded and difficult to tell.

Do you have a bi-directional scanner you can try to 'talk' to the hvac module?

Sorry, I haven't had this one happen yet, but those are things I'd probably try if I did.

Anything come up on the Colorado forums?

I know how frustrating wiring snafu's can be, I feel for ya bro!

 

[SolidusJ]

Did you perform the tried and true method of unhooking the battery and draining the PCM power overnight?

Did you remove the fuses and check them, also for power? Sometimes fuses can 'look' good, but be internally corroded and difficult to tell.

Do you have a bi-directional scanner you can try to 'talk' to the hvac module?

Sorry, I haven't had this one happen yet, but those are things I'd probably try if I did.

Anything come up on the Colorado forums?

I know how frustrating wiring snafu's can be, I feel for ya bro!

I just disconnected the battery for a few hours, I'll try and drain it this weekend.

All the fuses are in good shape.

I don't have a scanner but hopefully I won't need it when the new control unit comes in.

Thanks for the info and I'll run a few more tests.

 

[SolidusJ]

I got the radio back, I just used a constant 12 volt source from the OnStar module.



I really hate electrical work but I'm glad I have a good understanding of it to overcome issues.

 

[Traxx]

Ran everything new rather than use a harness to retain RAP and other functions?

 

[SolidusJ]

Ran everything new rather than use a harness to retain RAP and other functions?

Pretty much, just used the ACC, 12v caustic, ground and dimmer when I installed the radio. No RAP, but it's not a big deal for me.

 

[SolidusJ]

Got it working, seems like a relay went bed when I was playing with the T. Grabbed a few from the wrecked H3, different part number, but same set up on how it operates. Should have just listen to my wife about sitting down and trouble shooting it rather than throwing parts at it... I'm out 55 bucks with the new control still in route.

-Gear to Maintain

 

[RamRod]

Got it working, seems like a relay went bed when I was playing with the T. Grabbed a few from the wrecked H3, different part number, but same set up on how it operates. Should have just listen to my wife about sitting down and trouble shooting it rather than throwing parts at it... I'm out 55 bucks with the new control still in route.

-Gear to Maintain

I have fallen victim of that mentality many times before. Lately I have been much better at spending the time troubleshooting and it really does pay off.

Glad to hear you figured it out!