Check the BOO. Since the TS's work, we can assume the fuse is good (it controls the BOO and TS's as I recall).
Does the 3rd brake light work? If it does, the BOO (and fuse) are ok. Power for the outer brake lights run through the MF switch, whereas power for the 3rd brake light does not. That's why knowing if the 3rd one works is important.
If you have no brake lights at all, check in/out voltage at the BOO (be sure the switch is closed when you test output voltage).
Good luck.
to check BOO
#1.using test light,touch terminal at BLUE arrow with pedal in normal position.if test lights illuminate.switch is receivlng power.if no power here,check wiring to the BOO switch,also check fuse #9 under dash,should be 15 amp fuse.
#2.press brake pedal down,touch test light to RED arrow.if light illuminates,switch is working.
#3.if switch works,problem is most likely in the wiring.your going to need a wiring diagram,but im sorry i dont have one.
If switch needs to be replaced.
#1.disconnect wiring,BLUE arrow
#2.pull out brown pin,RED arrow.
#3.slide out in direction of PURPLE arrow.make note of the position of the plastic washer and bushing.
#4.install is reverse of removal.
Old thread but having a similar problem. Brake lights went out after working fine. The chime and dome light still work so I know the fuse is good (also checked it) Here is the weird thing. With the key out of the ignition now if I press the brake pedal the chime goes off and my HVAC panel lights come on. sounds weird right? this was not happening before, and I have touched nothing related to these circuits. I did read where someone with a Camaro had a similar issue and turned out to be shorted bulb, he put a dual filament bulb in. I did just change my bulbs to led, so I am going to pull them out and start there with a voltmeter / old bulbs. Would be nice if it really was just that. Just putting this up here as the symptoms are different.
Believe it or not, my problem was due to an incorrect bulb that was shorted out. It was one of the marker bulbs. I took out everything I still had all the same symptoms. I put a working marker bulb, and the one that was blown and everything went back to normal. I have since replaced all the bulbs and I am. That is the weirdest symptom for a blown bulb I’ve ever seen.
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