Can't find towing brake control hookup connector under dash

Starrman · February 25, 2007

I've been looking under the driver side dash but can't find this connector. The one on the harness that I have is brown, so I guess the one it plugs into is brown also. HELP

pwall · February 25, 2007

Under the dash on the drivers side, top left corner there is a 'black' box (not like in a airplane... ;) )

Remove the cover and the connector will be inside, along with others.

The brake controller connector will only fit one connector in the box.

If you don't have a owner's manual, send me your email address and I can mail out a PDF version for a 2002 YukonXL, which is the same as the 2001 anyways.

Starrman · February 25, 2007

Thanks, I was just looking for the connector and didn't know it was contained in a box with others. I'll give it a look later this evening. Oh, I do have the owners manual, but I only saw 1 small paragraph in there talking about that Z82 Glove Box Jumper and Brake Controller pigtail. Altho there is a small diagram on the tag thats on the pigtail wiring harness along with the 40amp fuse, but that diagram is pretty generic and confusing.

Thanks

bossier62guy · February 25, 2007

I just installed one on my 02 last weekend. The diagram is inside the little black box showing you which connector to use (it will fit more than one)....it's a pretty simple process though.

Starrman · February 25, 2007

is this black box on the firewall along side the pedals or behind the front part of the dash?

bossier62guy · February 25, 2007

It's right above your emergency brake pedal (when it's depressed)....just unscrew that plastic nut off of it and pop it off.

Shaners · February 26, 2007

The factory supplied harness will plug into the junction box which is covered by a black plastic cover and is located behind the E brake. There is one or two black plastic nuts that need to come off to remove the cover. Your harness will plug in on the top row second from the left.

When you connect the harness to the controller, the colored wires will most likely not match. Use the little pieces of labeled tape that are on the wires from the pigtail and the controller to match them up.

There may very likely be a dummy fuse in the underhood electrical center which will have to be removed and the 40A maxi fuse will have to be installed. My dummy fuse was covered by a piece of paper/tape.

chew · October 25, 2007

Under the dash on the drivers side, top left corner there is a 'black' box (not like in a airplane... ;) )
Remove the cover and the connector will be inside, along with others.

The brake controller connector will only fit one connector in the box.

If you don't have a owner's manual, send me your email address and I can mail out a PDF version for a 2002 YukonXL, which is the same as the 2001 anyways.

Do you know if the 2004 Denali has the same setup? I have a prodigy brake controller with the GM adapter harness. I assuming this harness (with the GM 3015 plug) will mate with the connector under the dash; which I haven't been able to locate. I'm going to look for this 'box' near the emergency brake pedal. Lastly, is the harness (in the box) properly fused for electric brakes? (I would assume so since that is what the cable is for, but just thought I'd ask) Thanks!

Colorado Kid · October 25, 2007

Under the dash on the drivers side, top left corner there is a 'black' box (not like in a airplane... ;) )
Remove the cover and the connector will be inside, along with others.

The brake controller connector will only fit one connector in the box.

If you don't have a owner's manual, send me your email address and I can mail out a PDF version for a 2002 YukonXL, which is the same as the 2001 anyways.

Do you know if the 2004 Denali has the same setup? I have a prodigy brake controller with the GM adapter harness. I assuming this harness (with the GM 3015 plug) will mate with the connector under the dash; which I haven't been able to locate. I'm going to look for this 'box' near the emergency brake pedal. Lastly, is the harness (in the box) properly fused for electric brakes? (I would assume so since that is what the cable is for, but just thought I'd ask) Thanks!

Yes the Denali is the same.

Yes the Prodigy harness will plug right in.

Yes everything will be properly fused for trailer brakes if you just plug it in.

The other fuse that folks are reffering to, where there may or may not be a dummy fuse in the underhood maxi-fuse panel, is the one that will provide poser toi the "+ 12V" pin in the trailer connector. This is the one that charges the trailer battery for camping trailers. If you're towing a boat, a cargo trailer or a simple horse trailer this circuit probably isn't used.

lynnpatt · September 21, 2008

Does the 2008 2500 GMC have a box under the dash to plug in an electric brake controller or does it have to ne hard wired?

c4cruiser · September 21, 2008

Does the 2008 2500 GMC have a box under the dash to plug in an electric brake controller or does it have to ne hard wired?

The NBS trucks don't have a connector like the GMT800 trucks did. The individual wires (they are loose ends) have to be spliced into your trailer brake connector harness. Why GM decided to do it that way is very disappointing.