Ibc

[Dmaxing]

Ok now I have a problem with my brake controller, worked for a while now I get nothing on the dic when I hook up my trailer and I have taken my truck to the dealer and they say nothing wrong with the controller had 2 friends hook up their trucks and they see my trailer, changed the 40amp fuse still nothing changed the plug on the back still nothing. Any ideas anyone.

 

[S Phinney]

There have been some issues that require the controller to be changed out even though GM claims it's good. I would check into that if it's under warranty. Maybe call Gm customer service and start a file there if necessary.

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[Ron Nielson]

make a tester with a brake magnet (or head light) so that you know you have the proper resistance on the circuit. When you connect the tester, you should ge the 'TRAILER CONNECTED' message. If the tester doesn't produce this result, your truck has a problem. There is a programming update that helps; ITBC Molule, ITBE relay, Fuses are common causes of this symptom.

 

[Dmaxing]

make a tester with a brake magnet (or head light) so that you know you have the proper resistance on the circuit. When you connect the tester, you should ge the 'TRAILER CONNECTED' message. If the tester doesn't produce this result, your truck has a problem. There is a programming update that helps; ITBC Molule, ITBE relay, Fuses are common causes of this symptom.

Ok built a head light tester and I get trailer connected press brake and get graduated graphic, plug my truck in to trailer I get nothing, two buddies plug their trucks in to my trailer and they get Trailer Connected one truck is a GMC 2014 with an ITBC the other a ford with an aftermarket controller, go figure.

 

[Ron Nielson]

Check to see if your truck has been upgraded:

TECHNICAL

Bulletin No.: 09-05-22-004

Date: November 05, 2009

Subject: No "Trailer Connected" Message on Driver Information Center (DIC) at Startup When Trailer is Connected (Reprogram ITBCM)
Models:
2007-2008 Chevrolet Silverado
2007-2008 GMC Sierra
Equipped with Integrated Trailer Brake (RPO JL1)

Condition

Some customers may comment that when they connect their trailer, with the engine off, and after they start the engine, the Trailer Connected message is not displayed on the DIC. With the engine running, if the trailer connector is cycled, the vehicle will detect the trailer and display Trailer Connected. This concern should only affect trailers equipped with trailer brakes on a single axle.

Cause

The trailer brake control system is only compatible with trailers equipped with electric trailer brakes. The system will not work or detect trailers equipped with any other types of brakes such as surge, air or electric-over-hydraulic trailer brake systems. When a trailer is connected, the Trailer Brake Control Module (TBCM) performs a test to determine if the trailer is equipped with electric trailer brakes. If the trailer wiring or electric trailer brake magnets have additional resistance (caused by poor connections, corrosion, improper splices, etc.), the TBCM may not be able to detect the trailer.

Correction

A revised calibration has been developed to address these issues. Reprogram the Integrated Trailer Brake Control Module (ITBCM) with updated calibration files using the TIS2WEB Service Programming System (SPS) application. Refer to SI and Service Programming System (SPS) documentation for programming instructions, if required. Refer to Trailer Brake Control Module Programming and Setup in SI.