Installing Electric Brake Controls on a Chevy Uplander, Pontiac SV6, Buick Terraza or Saturn Relay

Technical Bulletin

SUBJECT/Summary: 2005-2008 Chevrolet Uplanders, 2005-2007 Pontiac SV6s, 2005-2007 Buick Terrazas and 2005-2007 Saturn Relays use a multiplex wiring system.

PROBLEM: If you connect a brake control to the "cold side" of the brake light switch, it will shut down the brake light system.

SOLUTION: The brake light switch sends an input to the Body Control Module (BCM), which activates the high mount stop lamp. The wire that operates the high mount stop lamp can be used to activate the brake control. Connecting to this wire will not have any effect on the BCM according to GM.

The signal for the red wire can be obtained at the BCM. The BCM is located just under the front of the dash on the left side, just above your left knee as you are seated in the driver's seat.

On the very bottom of the BCM you will find a 52 pin connector. The label on the bottom can identify the BCM. On this label will be the acronym "VCBM" , and the 52 pin connector will have a green locking clip. In the center of this 52 pin connector you will find a white wire. This wire is the high mount brake light wire.

The white wire is in pin location 30. This wire will have 2.5 volts with the ignition in the run position, even though the brake pedal is not applied, and will go to 12 volts when applying the brake pedal.

Brake Control Wiring Pin Location Diagram

Product Number: Brake Controls: ALL

Manufacturer: Tekonsha and Draw-Tite

Bulletin Date: 10/18/2010

Bulletin Number: TB10-10

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