The left and right brake lights work just fine, as do the signals. However, the center brake light on the back window does not work. Checking with a voltmeter, I don't seem to be getting voltage where the cable plugs into the light.
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Re: center brake light does not work
Follow the wiring into the trunk area. sometimes it becomes disconnected when you load things into your trunk. You should only be getting voltage when the brakes pedal is pressed. Otherwise, it could just be a bulb replacement fix.
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i am CONFUSED? you say they dont work, then you say "when you press down on the brake that the switch for the lights causes them to go off instead of turning them on when messing around with it but couldnt figure this out"........ if NO brake lights work, then check fuse 23. . if the fuse is GOOD then check wires at the brake switch. Orange should have 12V, when brake pedal is pressed then the WHITE should have 12V and lights should be on. the center rmounted stop light (BACK WINDOW) has 2 bulbs, make sure they are good. The center light is wired differently. If the center light works but brake lights do not, the turn signal switch could be bad. I assume THE TURN SIGNALS are OK? IF the turn signals are working OK, the wiring between the turn signal switch and the brake lights is GOOD
Replace the turn signal switch. Bad contact inside causing a crossing of the circuits. When the turn signal is applied it should open the brake light circuit allowing for just the signal to work. Doesn't sound like the switch is doing it's job.
the upper brake light works differently than the outer lights. check your brake light switch by the brake pedal.It will have a plunger switch on it. The center brake lamp works off a power convertor instead off the brake light switch. The switch has a separate wire for that which is still working
Hello. The symptoms you are describing are likely due to a poor ground. Temporarily install a new ground wire by securing a piece of copper wire to the frame with a self tapping screw. Use this ground wire along with the hot wire to see if each of these lights works. If it does, trace the ground wire back to the frame, unscrew it and clean up the metal with emery cloth so you reestablish a good ground.
the problem is most likely in the turn signal switch. the power for the left and right brake lights goes through the turn signal switch, but power for the center mount comes straight from the brake light switch. this allows the brake light to be turned of so the turn signal can operate as they use the same filimant in the bulb.
It may be a turn hazard module under dash.that is the culprit! The power to the third brake light does not go through the module, but the rear brake lamps power is controlled through this module. I am looking at a drawing of one and it looks like it has two connectors with about five wires in one and six in the other. It has some cooling fins on it also.
I had the same problem with my 2001. I found it was the multi function switch. Better known as your turn signal switch. I found that the hazard switch portion of it had shorted. replacement is fairly easy, aftermarket part is available, much cheaper than GM.