03 TB Ext Rear A/C - Radio No Power - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 09-16-2007, 12:40 AM
talipski talipski is offline
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2003 Chevy TrailBlazer LT EXT
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03 TB Ext Rear A/C - Radio No Power

The rear a/c - radio on my center console has no power to it, and you can't turn on ac or heat from the switch by the shifter either. I have checked the fuses under the rear seat and all look fine. Any ideas on what else to do? Thanks...
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  #2  
Old 09-16-2007, 10:42 AM
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RayVoy RayVoy is offline
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The front switch for the rear unit is powered by the AUX HVAC control mod. It's powered from fuse 36 in the rear fuse box. But the radio controls are separate, as far as I know. Do u have any lights working on these controls? If no, look for a disconnected cable near/under the console.
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Old 09-16-2007, 12:24 PM
talipski talipski is offline
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nope nothing... no lights or anything... I am sure I could figure out but best way to remove the console...?

Thanks...
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Old 09-16-2007, 03:59 PM
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I think it comes out with out a lot of work. You need to remove the shifter handle (small screw under thumb button) and if these are like other GMs, the shifter need to be in the vertical (like in D). After removing the cup holder liners and the insert under the cover, the screws should be visible.
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Old 09-16-2007, 04:35 PM
talipski talipski is offline
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well popped out the rear unit and that plug seemed snug... unplugged and replugged just to make sure... Will start taking apart in a few...

thanks for the help so far...
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Old 01-31-2009, 07:37 AM
jpentecost jpentecost is offline
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Dead rear console

I have the same issue - dead stereo and HVAC controls in the rear of the console. Also the rotary fan switch is not working (R, 0, 1, 2, 3 switch) so there is no blower working in the rear.

ANy thoughts?
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Old 01-31-2009, 01:33 PM
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HVAC B fuse 36 under the rear seat would affect both functions.
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Old 01-31-2009, 02:43 PM
jpentecost jpentecost is offline
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Not a fuse

Thanks for the suggestion but I had already checked the front and rear fuse panels. Relay 45 for the rear fog lamps seems to be missing. Is this possibly related?

It is a used vehicle which I found had a leaking rear heater core. The theory is that the seller might have disabled the rear system somehow.

Any other thoughts?

John
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Old 01-31-2009, 03:22 PM
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Quote:
Originally Posted by jpentecost View Post
Thanks for the suggestion but I had already checked the front and rear fuse panels.
Wish you had added that to your first post. Helps us understand better what level of suggestions to suggest. You might not believe it, but we've had some newbs show up here not ever reading the owner's manual, not knowing they even HAD a rear fuse panel.
Quote:
Relay 45 for the rear fog lamps seems to be missing. Is this possibly related?
Wish you had filled out your profile with location. I may be wrong, but I think rear fog lamps aren't an option for US vehicles. We have backup lights, but they are in different locations for Envoys versus TBs. Maybe you're out of the US? Anyway, the rear fog lamp option, if you have it, is RPO code T79 on the glove box sticker. And the relay isn't at all connected to circuits for the rear audio or HVAC controls.
Quote:
It is a used vehicle which I found had a leaking rear heater core. The theory is that the seller might have disabled the rear system somehow.
Wish you had filled out your profile with what vehicle you have. (See the trend here? ) I thought you were a short wheelbase (SWB). The long wheelbase vehicles, as you said, have a rear heater core. If it was leaking, the previous owner may well have disabled the control to make sure the coolant bypass valve doesn't even send coolant back there to leak. I've even seen folks fiddle with hoses to make sure no coolant gets sent to a leaking core.

If the fuses are OK, then the previous owner probably pulled the connector off the back of the rear control module/display. Have you been inside the console to check it out? You have to remove the shift handle with a Torx driver, plus a bunch of other hidden screws, to take out the console.
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Old 01-31-2009, 07:30 PM
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Quote:
Originally Posted by the roadie View Post
If the fuses are OK, then the previous owner probably pulled the connector off the back of the rear control module/display. Have you been inside the console to check it out? You have to remove the shift handle with a Torx driver, plus a bunch of other hidden screws, to take out the console.
Bill, don't want to interrupt a good train of thought, but I have the LWB truck and I think the HVAC panel can be popped out of the console without taking the console out of the truck. Worth a try.
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