To access the wire you must pop up the third brake light cover through the inside of the car. There is a white two-pin plug on the left side of the light--unplug it.
Do not try and pull too hard on the wire. The harness will only allow you about 4 inches of slack.
There are 3 types of Brake Plus modules: Regular, Black Stripe, Red Stripe
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Are you having issues with installation? Check out our troubleshooting guide for common errors associated with the installation of Brake Plus.