Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series

7 Series / 8 Series
The BMW 7 series and 8 Series Forum

 
 
Thread Tools Display Modes
  #1  
Old 02-17-2010, 10:23 PM
cdm5goby cdm5goby is offline
Registered User
Location: Southern California
 
Join Date: Jan 2009
Posts: 14
Mein Auto: BMW X3 3.0i
95 740i - Stop light switch

I brought my 1995 740i to the local dealer to diagnose and repair the ABS and traction control light that were illuminated in the dash cluster. I assumed it was something like a wheel speed/ABS sensor, but I wasn't sure. At first, the SA called to tell me that there was a "low voltage" code stored and after clearing the fault, the car was driven and the lights didn't come back on. Later in the day, my SA called to tell me that the light came back on and they were able to trace it to the stop light switch. I don't understand why the stop light switch has anything to do with the ABS and ASC lights coming on. the "Brake" light didn't come on and the brake lights always seem to work whenever I check them despite the "Check Brake Lights" warning comes on. I figured that was related to the bulb sockets being loose or having slight corrosion on them. Does any of this make sense to anyone? Is the stop light switch difficult to change? My dealer quoted me $353 for the job. Thanks in advance for your help.
Advertisement
  #2  
Old 02-18-2010, 07:56 AM
TxGr8White TxGr8White is offline
Sick Puppy Motorwerks
Location: Dallas
 
Join Date: Jan 2010
Posts: 132
Mein Auto: BMW 850Ci
Stop light switch isn't the "easiest" of jobs. The part alone is over $100.
__________________

White 1993 850Ci - 251,187 miles
Black 1993 850Ci - 125,508 miles
  #3  
Old 02-18-2010, 09:07 AM
M.Wong's Avatar
M.Wong M.Wong is offline
E38 E91 (R56 E30 E39)
Location: Seattle WA
 
Join Date: Jan 2003
Posts: 2,323
Mein Auto: The E38
ABS, DSC, and BRAKE (all three lights in yellow) is often is the ABS module. "Check rear lamps" is a bulb issue.

If you get an error code indicating the speed sensors, they are at each wheel can be removed and cleaned before going to replacing them. You can swap them left/right to check if the error code 'moves' from one spot to the other, to verify which is faulty.

We are not talking about the steering angle sensor, right? Often a bad module will throw codes for the speed sensor(s) or the steering angle sensor, but it's actually the module that is bad.

The switch at the top of the brake pedal? I thought those were only about $30 to $50? If that's it, reaching up there is a challenge but do'able after you take the lower knee bolster off, as well as a couple vent plastic pieces.

08 STOP LIGHT SWITCH 61 31 6 967 601



(Often forgotten - checking the high mounted center brake light bulb when the error comes up.)
__________________
M.Wong
E38 2000 740iL Orient Blue
E91 2012 328xiT Alpine White

Passed on to new families:
E30 1987 325i Royal Blue
E39 2003 540i/6 Sterling Gray
R56 2010 Mini Cooper S British Racing Green


  #4  
Old 02-18-2010, 08:21 PM
cdm5goby cdm5goby is offline
Registered User
Location: Southern California
 
Join Date: Jan 2009
Posts: 14
Mein Auto: BMW X3 3.0i
The guy I bought the car from plugged in the code reader and said it was a faulty front right wheel speed sensor. Only the ABS and traction control light are on, not the 'brake' light. I often do get the message that i need to 'check brake lights' but not always. when I first start the car there are no warning lights on. Only after driving a mile or so do the two lights come on together. My dealer checked over the car and told me that the wheel speed sensors are fine and that the stop light switch is bad. I don't know what to do. I want to thank everyone on here for your assistance and for sharing your wisdom.
  #5  
Old 02-18-2010, 10:26 PM
TxGr8White TxGr8White is offline
Sick Puppy Motorwerks
Location: Dallas
 
Join Date: Jan 2010
Posts: 132
Mein Auto: BMW 850Ci
What to do?: real simple, pull the wheel speed sensor on the back of the hub (iirc, it is a single 5mm allen key) and clean the magnet off real good, reinsert and tighten. Put wheel back on and go for a spin. If it is indeed a Wheel Speed Sensor, then this is a "free" fix. If for some reason it still doesn't work, get a new one. If you know the difference between a phillips and flat blade screwdriver, then you can do this repair yourself.
Wheel Speed Sensors are nothing more than magnetic reed switches and have no moving parts. The only real way to damage one is to cut the wire.
Good luck and let us know how it turned out.
__________________

White 1993 850Ci - 251,187 miles
Black 1993 850Ci - 125,508 miles
  #6  
Old 02-18-2010, 10:45 PM
cdm5goby cdm5goby is offline
Registered User
Location: Southern California
 
Join Date: Jan 2009
Posts: 14
Mein Auto: BMW X3 3.0i
Thanks, I'm gonna try that tomorrow.
  #7  
Old 02-19-2010, 12:57 AM
M.Wong's Avatar
M.Wong M.Wong is offline
E38 E91 (R56 E30 E39)
Location: Seattle WA
 
Join Date: Jan 2003
Posts: 2,323
Mein Auto: The E38
It's as easy as TxGr8White says!

Looks like this:


__________________
M.Wong
E38 2000 740iL Orient Blue
E91 2012 328xiT Alpine White

Passed on to new families:
E30 1987 325i Royal Blue
E39 2003 540i/6 Sterling Gray
R56 2010 Mini Cooper S British Racing Green


 

Bookmarks


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series
Today's Posts Search
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On



Forum Jump


All times are GMT -7. The time now is 06:07 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
© 2001-2011 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms