Brake circuit Code?? - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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#1 (permalink) Old 02-14-2006, 07:32 PM
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Brake circuit Code??

Hello everyone im new to the forum, not new to the cars luckily! I just recent bought a 1993 325is few days after buying the car the OBC flashed a brake light circuit check owners manual code?? Everything checks out fine in the brake lights? It only happens once twice a week. Has anyone heard of this?
Thanks in advance for the help. I also have a set of 18x8.5 wheels that came off of my 633csi will fit 6 7 8 ser cars best offer accepted.

Current Car- 93 325is Exhaust, Intake, side marker delete, Cross drilled/slotted rotors, other misc crap.

Old cars 94 750il, 84 633csi, 88 POS Ford Mustang GT
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#2 (permalink) Old 02-14-2006, 09:53 PM
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99% chance you need a new brake light switch. Its a common problem we see at the BMW shop I work at.
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#3 (permalink) Old 02-14-2006, 11:09 PM
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before you replace the switch, check your contacts on both sides of the brake light connectors,

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#4 (permalink) Old 02-15-2006, 02:11 AM
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Quote:
Originally Posted by Furious
before you replace the switch, check your contacts on both sides of the brake light connectors,
He said the lights work fine which leads me to think that the switch is starting to fail.
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#5 (permalink) Old 02-15-2006, 10:32 AM
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My car did the same thing. I got the "brake light failure", "brake circuit failure" once or twice a day. I ordered the switch. Before it got to my house, some aftermarket lights I had ordered arrived. I installed the aftermarket lights and guess what? It's been over a month and there has been no " brake light" or "brake circuit " error on the OBC. Everything has been quiet. Might have been something wrong with my lights, don't know. And yes, my OEM lights worked every time I checked them, as do the new lights. I'm holding on to the switch, just in case.

1995 325I, window tint, K&N, debaffled airbox, BMW #104 wheels, Nighthawk low beams, smoked side markers, smoked corners, smoked taillights, M3 stlye heated mirrors, various interior bits, Bosal cat-back.
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#6 (permalink) Old 02-15-2006, 07:13 PM
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Thanks for the help, i am getting the red/clear tails, if problem still occurs, then looks like new switch goes in.

Current Car- 93 325is Exhaust, Intake, side marker delete, Cross drilled/slotted rotors, other misc crap.

Old cars 94 750il, 84 633csi, 88 POS Ford Mustang GT
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#7 (permalink) Old 02-15-2006, 09:46 PM
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where is this switch located?

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#8 (permalink) Old 02-16-2006, 12:10 AM
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Quote:
Originally Posted by WarNox
where is this switch located?
It is under the dash in front of the brake pedal.

1995 325I, window tint, K&N, debaffled airbox, BMW #104 wheels, Nighthawk low beams, smoked side markers, smoked corners, smoked taillights, M3 stlye heated mirrors, various interior bits, Bosal cat-back.
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#9 (permalink) Old 02-16-2006, 05:07 AM
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and what does it do?

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#10 (permalink) Old 02-16-2006, 07:42 AM
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Quote:
Originally Posted by WarNox
and what does it do?
It turns on your brake lights when you push on the brake pedal to stop. And if you have the OBC, it triggers the failure codes when a bulb or some other part is broken.

1995 325I, window tint, K&N, debaffled airbox, BMW #104 wheels, Nighthawk low beams, smoked side markers, smoked corners, smoked taillights, M3 stlye heated mirrors, various interior bits, Bosal cat-back.
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#11 (permalink) Old 02-21-2006, 08:08 PM
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It is the Brake Switch. Cheap, a little difficult to remove, simple to install. I tore mine apart getting it out, just be sure not to bend the mounting bracket.

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#12 (permalink) Old 02-22-2006, 07:31 AM
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heres the diy i followed when changing mine and havnt seen the error since
http://www.geocities.com/karlkarlb/brakeswitch.html
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#13 (permalink) Old 02-22-2006, 06:46 PM
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but if the switch is broken and it turns on the break lights wouldnt that mean the break lights are also not working!?

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#14 (permalink) Old 02-22-2006, 08:42 PM
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No. What it does is give you a false error code. You should, of course, check anytime you get the "brake light failure" or "brake circuit failure" codes. If the lights are working, then the switch is most likely faulty and giving false codes. There are four wires on the switch. Two are used to trigger the brake lights. And two are used to monitor the brake light system.

1995 325I, window tint, K&N, debaffled airbox, BMW #104 wheels, Nighthawk low beams, smoked side markers, smoked corners, smoked taillights, M3 stlye heated mirrors, various interior bits, Bosal cat-back.
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#15 (permalink) Old 02-22-2006, 08:46 PM
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I bet it's the brake light switch, like everyone said.

btw, got any pics of the wheels you're selling? And what are you expecting to get for them, aproximatelly, so i know what to offer.

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