Brake circuit Code?? - BMW Forum

Lethal325is · 02-14-2006, 07:32 PM

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.

BMWJNKY · 02-14-2006, 09:53 PM

99% chance you need a new brake light switch. Its a common problem we see at the BMW shop I work at.

Furious · 02-14-2006, 11:09 PM

before you replace the switch, check your contacts on both sides of the brake light connectors,

BMWJNKY · 02-15-2006, 02:11 AM

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.

tomctx · 02-15-2006, 10:32 AM

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.

Lethal325is · 02-15-2006, 07:13 PM

Thanks for the help, i am getting the red/clear tails, if problem still occurs, then looks like new switch goes in.

WarNox · 02-15-2006, 09:46 PM

where is this switch located?

tomctx · 02-16-2006, 12:10 AM

Quote:

Originally Posted by WarNox

where is this switch located?

It is under the dash in front of the brake pedal.

WarNox · 02-16-2006, 05:07 AM

and what does it do?

tomctx · 02-16-2006, 07:42 AM

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.

motown3 · 02-21-2006, 08:08 PM

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.

jcy0001 · 02-22-2006, 07:31 AM

heres the diy i followed when changing mine and havnt seen the error since

http://www.geocities.com/karlkarlb/brakeswitch.html

WarNox · 02-22-2006, 06:46 PM

but if the switch is broken and it turns on the break lights wouldnt that mean the break lights are also not working!?

tomctx · 02-22-2006, 08:42 PM

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.

Torque · 02-22-2006, 08:46 PM

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.