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I just picked up my '08 AWD with trailering pkg last Friday. In the rear cargo bin under th rear floor, there is a wire harness with a connector attached. Is this for the brake controller? If so, where under the dash does it plug in. The car is great but I wish GM gave a bit more info about this.

Thanks,
Dave
 

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There is previous thread on this along with pictures. It is brake controller, and the connector plugs in under the dash on the left side of steering column. Had mine installed and brake controller mounted to the right of steering column. Installer said it was good setup and easy to do.
 

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Trying to find the previous thread with the pictures? I remember seeing it but can't find it now?
I have the wiring harness too (Tow pacakge SLE, AWD) and see a 'port or receptacle' under the steering wheel left side but the two don't seem to match? Is the port something different and the end of the harness plugs into something inside the dash? I guess I have time to look since the towing break in period happens AFTER the 500 mile inital break in period and we are on mile 240'ish.
That was more than a few questions at once - thanks in advance!
 

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andy said:
Trying to find the previous thread with the pictures? I remember seeing it but can't find it now?
I have the wiring harness too (Tow pacakge SLE, AWD) and see a 'port or receptacle' under the steering wheel left side but the two don't seem to match? Is the port something different and the end of the harness plugs into something inside the dash? I guess I have time to look since the towing break in period happens AFTER the 500 mile inital break in period and we are on mile 240'ish.
That was more than a few questions at once - thanks in advance!
I have the same dilemma with my Outlook - the wiring harness doesn't match the port under the steering wheel. If somehow you find the right one pls let me know - will be much appreciated :)
 

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The plug you need is located on the drivers side, just above and to the right of the parking brake. With a pair of blunt nose pliers, pull on the head of the three retention pins holding up the black panel that covers all of the crap under/behind the dash. Dont squeeze to hard on the plug, a lot of force is not needed. The center of the pin slides backwards and releases the expansion plug. You may need to engage the parking brake to gain a little room to work on the leftmost plug. The connector is taped to the wiring harness, just pull/cut it free.
 

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What am I gaining by taking this out? If you have the towing package, isn't everything already hooked up in the 7-pin?
 

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This connector and the corresponding wiring harness is part of the towing package and is for the electric brake controller. Your wiring harness adapter should have been in the glove compartment or somewhere else in the vehicle. You may have the towing package, but the electric brake controller does not come as part of that package. The wiring harness will allow you to easily connect one. There is apparently some debate as to whether or not all the wires in the 7 pin trailer connector at the hitch function properly from the factory. Mine was built sometime in February, and everything seems to work just fine on mine.
 

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Thank you Raistmaj for the pics and the info !! It looks like my Outlook has exactly the same plug so I will play with the supplied connector and my controller tomorrow.

Wrt 7 wire harness being fully operational....the user manual says that the two cables, 12 V charge to trailer battery and the one that powers trailer electric brakes are not connected to the fuse box by default even if the vehicle comes with the towing package. So I am going to plug everything and test the harness before I go to see the dealer and pay them 100 bucks for the visit (this is what they told me they would charge me).

J33

Raistmaj said:
This connector and the corresponding wiring harness is part of the towing package and is for the electric brake controller. Your wiring harness adapter should have been in the glove compartment or somewhere else in the vehicle. You may have the towing package, but the electric brake controller does not come as part of that package. The wiring harness will allow you to easily connect one. There is apparently some debate as to whether or not all the wires in the 7 pin trailer connector at the hitch function properly from the factory. Mine was built sometime in February, and everything seems to work just fine on mine.
 

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The 12v for the trailer battery on mine was functional and I had continuity between the trailer brake wire at the hitch and the plug located under the dash direct from the factory. Also, my reverse/backup light connection was operational also (thats the center connector if I remeber right, been a long time since I wired the trailers for towing with my Tahoe). It does not sound like everyone else was so lucky! I wonder if they did some sort of rolling change during the production run because of all the complaints they received. Let us know how it turns out when you try playing with it tomorrow.
 

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Cool. Got it now. Thank you, thank you. Brake controller ordered and on its way.

But what is the port that is right underneather the steering wheel? The one you can see without taking the panel off? Is it something a technician can connect to get data fromt he vehicle?
 

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Yes, that is the OBD2 (On-board diagnostics) port. OBD2 is on all 1996 and later vehicles. It allows you, with a reader, to read the failure codes generated by the computer on the car. You can pick up a reader just about anywhere these days for around 100 bucks. They come with a little book that tells you what all of the codes it may display mean. Attached is a picture of what a reader looks like.
 

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Quick question-

for those of you who have hooked up a brake controller on the acadia and used the plug found under the dash, was it a simple plug and play type installation or something that requires professional help? Also, what type did you end up using, P3, prodigy, etc.? Thanks in advance for any answers. I am a total newb!

Bill
 

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Here is a link to some posts that you may find helpful, including my experience at the bottom of the thread

http://www.acadiaforum.net/forum/index.php?topic=657.msg46652#msg46652

To elaborate more....the biggest challenge for me was to connect the cables from the brake controller to the harness provided with the vehicle. I had an older Teconsha Voyager controller that I used before. The plastic plug works like a charm, you just need to assess how much length you will need to accommodate the placement of the controller before you cut the harness.

I will try to post a picture of my solution over the weekend.
 

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Raistmaj said:
The 12v for the trailer battery on mine was functional and I had continuity between the trailer brake wire at the hitch and the plug located under the dash direct from the factory. Also, my reverse/backup light connection was operational also (thats the center connector if I remeber right, been a long time since I wired the trailers for towing with my Tahoe). It does not sound like everyone else was so lucky! I wonder if they did some sort of rolling change during the production run because of all the complaints they received. Let us know how it turns out when you try playing with it tomorrow.
So it turned out that all the cables were connected to the fuse box and once I installed the controller I had continuity on the plug for everything what was needed.
 

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J33 and others,
So, let me see if I got this right, based on the other topic you referred to me, if you have a prodigy controller, you would need to cut off the end of the plug on the acadia side and then use the wiring schmatic sent from Tekonsha and then connect the wires and I should be good to go? Thanks again for your replies.

Bill
 

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Bill,

I believe he's talking about trimming the length of wires from the unattached plug, not the end of the plug found under the dash. You might check with Tekonsha to see if they have an adapter to plug in directly, no splicing needed. There may not be the demand for these, I know Tekonsha has made them for other vehicles in the past.
 

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Lewisra,

Thanks for the reply. I was hoping it would be a simple plug and play with a harness and will keep my fingers crossed.

Thanks.

Bill
 

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Bill,

Lewisra is correct. I forgot to mention that Tekonsha provides a special harness for Prodigy controller for Acadia/Buick/Outlook. In this case you don’t have to use the wiring that comes with your Acadia and no cutting is required. The flat end (4 wires) plugs to Prodigy, the square plastic “cube” to the plug under the dash. It is truly a “plug and play” operation; all you need to figure out is where you want to mount your Prodigy.
Since I have the Voyager controller I had to use the wiring that GM provided. Hope this helps.

J33
 

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J33-

Awesome. That is exactly what I was hoping for. Thanks again for all of the help.

Bill
 

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Thanks for all those who helped with this, it made my install easy (once I got those clips out!) in an 08 Acadia.
The biggest challenge was the wiring match for my Escort controller, but the wiring diagram linked here fixed that.

As for mounting, found a great trick...
If you take out the matt, you will see that the carpet between the center console and the floor is not joined. There is plenty of looseness (and lenght) to slide the GM supplied cable between the floor and the console, then loop it over the top of pendals and over the top of the lower console plate that you have removed. Then, mount your controller just above the floor, on the side for the center console, just clear of the seat using velcro. Out of the way, just easily accessible to your hand if you need it.
 
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