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Integrated Brake Controller

Editeur

By Editeur
in Ask A GM Technician

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Editeur Enthusiast

Editeur

Posted
Posted

Can anyone tell me what the issue is concerning the failure of the GM integrated brake controller on the 2007 GM HD pickups? The dealer claims there is no fix at the moment and that GM is working on the matter. Editeur

Editeur Enthusiast

Editeur

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Thanks for the response. Do you know if the problem is in the controller, the wiring harness or a relay. When I was trying to trouble shoot to see if I was getting any power at the hitch connection I used a volt meter on the connection it simply flashes briefly and no more juice. Sounds like a relay issue. The unit worked great for two long trips. ie 5000 miles and 2000 miles.

 

Editeur

Editeur Enthusiast

Editeur

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Posted

Thanks. I think I know the answer to this but I need to ask. :-) If I need to by-pass the controller and install an after market controller, like Prodigy, do you know if the wires and open plug are installed under the dash as found in the units without the built in controller. Or is it as I suspect the wires are connected to the built in controller? And of course, can I just disconnect the built in controller and plug in the after market unit?

 

 

Editeur

cammiller Enthusiast

cammiller

Posted
Posted

To install an aftermarket trailer brake controller, use the four blunt cut wires located near the data link connector. Make the following changes to the vehicle harness:

 

Four Blunt Cut Wires

 

Dark Blue

Circuit 47

Brake Signal to Trailer Connector

 

Red/Black

Circuit 242

Battery Power

 

Light Blue/White

Circuit 6311

Brake Switch Input

 

White

Circuit 22

Ground

 

 

The Red/Black wire, circuit 242, must be connected to stud #2 of the 30 Amp fuse of the Underhood Fuse Block. This wire is located between the left fender and the Underhood Fuse Block.

Locate connector X126 (on vehicles without RPO JL4 ) or X115 (on vehicles with JL4) near the Underhood Fuse Block (Refer to SI Document ID# 1849049). Circuit 47 from the blunt cut wires near the data link connector will end at connector X126 terminal "G" or X115 terminal "B5." Obtain enough Dark Blue 12 gauge wire to run from X126/X115 to the 7-way trailer connector at the bumper. On one end of the Dark Blue wire attach terminal part number 15304732, located in Delphi Tray 8 and insert into X126 "G" or terminal part number 15304720 located in Delphi Tray 19 and insert into X115 "B5." Run the Dark Blue wire in its own conduit along the frame to the 7-way trailer connector at the bumper. Remove circuit 47 from the 7-way trailer connector terminal "C" and tape the bare terminal and attach to the harness. Attach terminal part number 12110853, located in Delphi Tray 4, to the other end of the Dark Blue wire and insert it into the 7-way trailer connector terminal "C".

Important: This procedure will not result in any Trailer Brake related display messages to be set. However, ITBC diagnostics will continue to function. If an ITBC fault is detected, a "Service Trailer Brake System" message will be displayed on the Driver Information Center (DIC) and an appropriate DTC will be stored in the ITBC module. The operator will still be able to adjust gain and access the "Trailer Gain / Output" display page in the DIC. However, the factory installed ITBC system will not sense a trailer connection and will not provide output to the trailer.

  • 2 weeks later...
  • 2 weeks later...
lehogie New Member

lehogie

Posted
Posted
Honestly I have no idea, Gm has a bulletin stating they know there is a problem, but a fix is not available yet.

 

We're about to buy a 2008 GMC Sierra 2500HD - and are trying to decide between one that has an integrated brake controller and one that does not. We need this truck to pull an 11,000 pound 5th wheel. Any advantages or disadvantages to having the brake controller integrated? In particular, is there a problem with getting an after market brake controller for this truck?

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