DSC and yellow brake indicator light comes on

P

peddy

Veteran
 London
Hi guys,

This has a happened a few times now. basically on a few occasions both the DSC and yellow brake indicator light come on. The handbook just says that i should get it checked (but then that's all it says). to fix the problem i turn the car off and lock it leave it a few seconds and when i turn the car back on the lights don't come back on. It happened again yesterday and i had to do this 3 times though (at each traffic light i got a chance to do it)

has anyone had this problem? should i get this checked out?

Pedram
 
nope front ones are brand new and rears got 6 months left. plus the DSC light wouldn't come on would it if it was the brakes? isn't it just the yellow brake light on it's own?
 
yeah, for the brakes it is.

i would check the connections on your brake sensors before you go to the dealer, it might just be a loose wire.

as for th dsc i have no idea
 
Rudd_2002 said:
yeah, for the brakes it is.

i would check the connections on your brake sensors before you go to the dealer, it might just be a loose wire.

as for th dsc i have no idea
Click to expand...

The DSC works by using data from the brake sensor doesn't it? I damaged that cable on a MINI and it sent the DSC system haywire.
 
i found this on bimmerfest. it's for a E46 3 series, but i'm guessing it'll still apply to me (although my ABS lights don't come on, just DSC and brakes). i'll give this a go next time the lights come up:

DSC, ABS, and BRAKE lights all illuminated?

This happens when the car has detected a fault and has disabled the DSC and ABS systems. If you recently drove on ice, a dynamometer, or on another very slippery surface, the car may just /think/ the system has malfunctioned. Driving a few miles on a regular surface should fix the problem.

Another fix is to slowly turn the steering wheel from completely left to completely right, then back again.

If you did not recently drive on ice and the wheel turning solution did not work, this is usually caused by either:

* One of your wheel speed / ABS sensors failing (there's one on each wheel)
* The DSC pressure sensor on the brake master cylinder is faulty
* Your steering angle sensor has failed
* Your battery needs replacement

An independent BMW mechanic should have the autologic/Modic3/GT1 computer required to read the codes to determine the source of the fault. If you want to diagnose the problem yourself, here is a post on e46fanatics that describes how to test each wheel speed sensor. Remove the wheel and identify the wires running from the back of the hub to a disconnectable wiring harness (do not confuse this with the brake pad wear sensor, which is only located on the front left and rear right wheel). Use the procedure above. The sensors are about $100 each.

The steering angle sensor is accessible from inside the cabin. You can find a picture of its location by searching for it on http://www.realoem.com/bmw.
 
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