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Hi, I need help, when my lights are on the rear left middle light illuminates, however when lights are off it does not. When I lock it with my key fob it does not illuminate either. Tried the bulb and fuse, what can it be that I need to replace or how to find out. TY
 

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BRAKE LAMPS
The brake (or stop) lamps and the Center High Mounted Stop Lamp (CHMSL) each have a path to ground at all times through a takeout and eyelet terminal of the body wire harness that is secured by a nut to a ground stud on the body sheet metal within the passenger compartment. The CHMSL receives battery voltage directly on the brake lamp switch output circuit when the brake lamp switch is closed by the brake pedal arm. The TIPM also receives battery voltage on the brake lamp switch output circuit, which it uses as a logic input to energize the brake lamps. The TIPM provides battery voltage to the brake lamps through two high side drivers on the tail/stop lamp rear feed circuit when it receives the proper input from the closed brake lamp switch.

Usually it is the wiring or even you need to replace the brake light switch.
 
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