HELP! Brake light problem - MR2 Owners Club Message Board
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post #1 of 6 (permalink) Old January 5th, 2017, 22:12 Thread Starter
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HELP! Brake light problem


I have a really weird problem with my MR2, hear me out.

1. My brake lights, side markers, and front turn signals turn on whenever I press the brake light.
2. When I turn on my lights. The rest of the lights are working fine but the brake lights are staying on the "ON" position.
3. Upon closer inspection. Whenever all of the lights are on, if I press the brakes, the brake lights gets a "TINY" bit brighter.
4. Whenever I press on the brake when the car isn't on, I hear a clicking noise. Bad relay potentially?

I've replaced the fuses, the brake light switch (which was a pain).

Is it a bad headlight relay? brake light relay (if there is one)? bad ground?

Help me out fellow MR2 owners because everyone I talked to have suggested the fuse and light switch solution but that wasn't my solution.

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post #2 of 6 (permalink) Old January 5th, 2017, 22:55
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Sounds like a short to power inside the headlight relay hard to say exactly
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post #3 of 6 (permalink) Old January 6th, 2017, 09:00
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Missing ground for one of the rear light clusters. That is how the parking lights get powered through the brake light circuit. It is usually a missing ground when two completely unrelated circuits start to interact. Just look for the common point where both are grounded.
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post #4 of 6 (permalink) Old January 6th, 2017, 17:22
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I remember a thread a year or so ago where a guy had a problem sort of like that and the problem was that someone had put a single filament bulb in a socket that required a dual filament bulb. The button on the tip of the single filament bulb was shorting the brake light ckt. to the tail light ckt.
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post #5 of 6 (permalink) Old January 6th, 2017, 18:11
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Honoze that happened to me too actually a couple months ago, but on mine a dual filament bulb the glass somehow came detached from its socket thus the vacuum escaped and it popped and caused a short popping the tail light fuse every time until I got to check all bulbs one by one
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post #6 of 6 (permalink) Old January 9th, 2017, 09:44
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It's worth mentioning when all the brake lights are either staying on or not working, it may be a good idea to crawl down next to the pedals and double check to make sure the switch is adjusted properly. Both have happened to me just from the car sitting or changing brake hardware. That's probably not the problem in your case but the other suggestions would be good places to check too.
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