Stop Light Circuit Location for Installing a P2 Brake Controller part # 90885 on a 2010 Cadillac SRX

Question:

Where do I connect the red wire on a 2010 SRX Cadillac?

asked by: Toby G

Expert Reply:

I spoke with my contact at Tekonsha and Tow Ready and I believe that I can help you locate a place to attach the brake controller red wire on your 2010 Cadillac SRX. The vehicle does have a dedicated stop light circuit located in the BCM (body control module).

The hardest part is going to be locating the BCM, but once you find it, it should be easy. The BCM is located under the left (driver) side of the dash. You will know it is the correct one because there will be 7 connectors plugged into it.

All 7 connectors will be a different color. You need connector X4, the black connector. In connector X4 there should be a white wire in terminal 11. This is the dedicated third brake light wire. Use a circuit tester like # PTW2993 to make sure that is the correct wire. It should only show a signal on the circuit tester when the brake pedal is pressed.

It does sound a little complicated but given enough time and patience, a bright flashlight, and a free afternoon, you should be able to locate the proper wire for your brake controller.

expert reply by: Jameson C