I removed the 2 inside panels at the rear of the car. This gave me access to the wiring going to the rear taillights. I used the circuit tester I got with the wiring kit to figure out which wire is for brakes, tail and blinker. I tapped into these and put the module to the left of the subwoofer against the rear of the car.(This is directly under the left rear taillight inside the car if you don't have the subwoofer.)