m626er

3Rd Brake Light Stays On

21 posts in this topic

Just when i finish fixing something, something else comes up, i noticed my 3rd brake light stays on, any ideas?

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Does it come on when you start the car or hit the brake pedal for the first time? Could be a brake switch. If it's just the 3rd brake light and not your tail lights then you'll need to get a multi-meter out and do some back probing. Do you have a spoiler with integrated brake light or just the 3rd brake light in the rear windshield? The manual refers to that as the high-mount brake light by the way.

Pull out the METER fuse and see if that kills it. Then pull out the STOP fuse (most likely). If so then at least you know what circuit it's on.

Check the connector in the 3rd brake light bulb housing (2 wire connector) and make sure it's snug. A constant light from any individual or all brake lights could mean a bad ground. If it's just 1 brake light constantly on then is probably a loose ground in that connector or wiring harness down the line. Follow the lead back to where it grounds out and make sure it's got a good ground. I doubt it's the brake light switch as that would probably cause the tail lights to be constantly on or off too.

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just seems to be the 3rd brake light i notice it on when i drive but i was against the building and i pressed on the brakes and the lights lit up bright on the tail lights, so where is this brake switch? BTW i got no spoiler.

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The brake switch is located at the top of the brake pedal lever. There should be 4 wires going to it (cross formation). The top wire should be battery positive voltage. The bottom should not. They will switch when the brake pedal is depressed. Therefore, if you've got positive voltage on the bottom wire without the brake pedal depressed replace the switch.

Please note the attached diagram is for no light troubleshooting. The procedure should be the same but you want to find voltage where it shouldn't be right? Right!

Note: this is from the 1995 service manual. I don't have the body electrical troubleshooting manual for the 97.

img-322639-1-F-20.jpg

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well i checked the fuse the fuse was ok, will check voltages when i get home cause i dont have multimeter with me

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went out for a drive, realized that the 3rd brake light goes bright as i press the brake, but i noticed other 626's in my area that the 3rd light dont stay on......

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the third BRAKE light is just that, it should only function as a brake light not a taillight, thats odd, i dont know what would cause that.

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well when i press the brakes the taillights, and the 3rd brake light illuminate brighter, but it seems that the tail lights are already brighter, but it could be me....it maybe my brake switch, anyone know the average price of a brakeswitch?

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I could be wrong, but doesn't this double as he trunk light? If so, it could be the trunk switch.

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hmm yes, the trunk light does shine through into the brake light up there, thats a good call, i'd check that and make sure that light goes out, could be sticking on.

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are you sure you've got the right light bulb? should only be a single filament bulb in there, sounds like you have a double filament bulb?

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Since it gets brighter when the brakes are pressed that almost rules out the brake switch but the trunk light staying on and partially illuminating it makes since. Check the bulb and see if it is hot as soon as you open the trunk or remove the bulb to see if that is the cause. It could be a ground issue as well, but not sure what would try to go to ground in that circuit other than the parking lights but if that was the case it wouldn't come on unless they were on.

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I know that It did not do this before and I did not change any bulbs so that can be ruled out

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not saying that the bulb is wrong by any means, just saying maybe the trunk switch isnt fully closing, so it illuminates the trunk light as if its open, fold down your back seat and see if the light stays on.

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i thought mine was kinda jacked up one night because i had the trunk off to tweek the hinge / readjust the trunk and the light was on and i thought the brake lights were on lol.

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nah trunk light was not on, but my light is in the back window not on the trunk similar to this 626 here:

img-323343-1-1925680001_large.jpg

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now someone told me i have ABS, not the last time i "bled" the brakes i was bymyelf and someone told me i could tap the brake pedal and the air would slowly leak out, could this be my brake light problem?

I also did try re-bleeding my brakes the right way, still didnt work.

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ETCG just posted a video this week on brake light switches and I immediately thought of this post. The brake switch isn't exactly the same as our of course but the idea is. Hope this gives you a better idea of what to look for.

Found another person (Cobalt forum) with the same problem and it was the brake light switch as the culprit. Seems to be changing the brake switch will solve the issue. When you bleed the brakes you have to step on the brakes rather hard and perhaps that's what caused the switch to get all funky. Seems like a logical cause/effect to me. Give it a shot.

1997 Mazda 626 LX 2.0L Brake Light Switch average price is about $10-$20.

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