CLK... ABS/BAS/ASR Warning Light QUICK FIX HERE - Mercedes-Benz Forum
LinkBack Thread Tools Display Modes
post #1 of 11 (permalink) Old 01-03-2012, 01:57 PM Thread Starter
BenzWorld Junior Member
Date registered: Nov 2011
Vehicle: 1998 CLK320
Location: Long Island NY
Posts: 12
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)

I want to thank all the people who post here because the info has saved me thousands $$$$!
Hope this post helps someone else.
My CLK320 has had warning light issues (ABS, BAS, ASR, etc) for the last 3 weeks. I came to the forum to look for a solution. Not only did I find comprehensive info, but pictures and diagrams!
I read all the posts and a lot of people seem to have the same problem with warning lights. Everything from checking the battery voltage to checking for codes was suggested. Most of the posts said to replace the stop light switch so that’s what I did.
PROBLEM SOLVED: I solved all of my warning light problems (BAS, ABS,ASR, etc) with the purchase of a new stop light switch.
The switch cost $29 at the MB dealer here on Long Island.
I followed the instructions for replacing the switch that I found here on the forum. With a Phillips screw driver it took me eleven min. to change out the switch. The dealer wanted $240 to do the same job.
After I had the old switch out I was curious as to why MB switches fail so frequently so I took it apart to see what made it work. What a simple concept switch to cause so many warning light problems.
As you can see by the included PDF with multiple pictures I have shown all aspects of the defective switch if you are interested. The burnt contact is what causes our warning light issues. If full FLAT contact is not made in both terminals of the switch the computer is fooled into thinking that the power source is weak or that another component has failed. This is the same design principle as was used in a set of “POINTS” in the distributor in older model cars. Now that cars are electronic ignition these “points” distributors have been eliminated in most cars.
1) Remove (4) screws in the BLACK plastic cover that hides the underside of the dash. Three are all in a row and one is over by the hood/bonnet release and this one is recessed. You will need a Phillips screw driver. Once screws are removed lower the cover and you will see the underside of the dash and brake arm area. You CAN’T remove the panel completely because the hood/bonnet release is attached. Just lower it so you can have work space.
2) With your flashlight, look up under the dash and locate the switch at the top left (US CARS) of the brake pedal arm. Find the clip in the PDF file pictures and squeeze while turning the switch CLOCKWISE to release it from the mount.
3) There are two wiring harnesses to the switch. One small, One Large. BOTH have releases that must be pressed to get harness released. On the small harness I used a very small blade screw driver to pry the harness away from the switch. This small harness has small “plastic cleats”, that hold it in the switch. Take your time and go back and forth from one side to the other until the harness disconnects.
4) On the Large harness squeeze the side releases and wiggle back and forth side to side until it releases.
5) MOST IMPORTANT… Place NEW switch next to OLD switch and make sure white plunger is the same length from mounting base to the tip. If NEW switch plunger is longer take a pair of needle nose pliers, place tip in the squared indentation at the top of the plunger and slide backward toward the switch, it should lock into place at a shorter length. If your old switch is the same length as the new one you don’t have to do anything. I believe that this switch is used in many makes and models so it needs to be different lengths for different cars.
6) REINSTALL THE SWITCH… Push both harnesses into the switch, make sure they seat all the way. The switch can only go in ONE way, it has a small slot and a big slot. Insert the switch into the mounting bracket, turn COUNTER CLOCKWISE. Raise the black panel back into position and install the four screws… YOU ARE DONE! You should have NO BAS, ASR, or ABS lights now.

If you need additional information just email me and I will be glad to help with your stop light switch “Quick Fix”.
Attached Files
File Type: pdf CLK320 Stop Light Switch.pdf (622.5 KB, 6455 views)
newyork5star is offline  
Sponsored Links
post #2 of 11 (permalink) Old 08-29-2012, 04:03 AM
BenzWorld Junior Member
Date registered: Jul 2008
Vehicle: W107 350SL 1971, CLK 200 W208
Location: Warsaw, Poland
Posts: 20
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
thanks. I will try this tomorrow and see how it goes
iceman350SL is offline  
post #3 of 11 (permalink) Old 08-29-2012, 01:19 PM
BenzWorld Elite
A1EK's Avatar
Date registered: Sep 2005
Vehicle: W208 CLK230K 2000 year, Past -W203 C Class, W202 C Class, W210 E Class, W201 190E
Location: Scotland
Posts: 1,440
Mentioned: 0 Post(s)
Quoted: 25 Post(s)
Glad you got it fixed ! this is a very common fault on W210, W202, W208 cars.....

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
A1EK is offline  
Sponsored Links
post #4 of 11 (permalink) Old 08-29-2012, 05:45 PM
BenzWorld Member
Date registered: Jul 2012
Vehicle: 02 CLK55 AMG
Location: Atlanta GA
Posts: 60
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Anyone have the part # for the switch ?
rsparso is offline  
post #5 of 11 (permalink) Old 09-07-2012, 06:45 AM
BenzWorld Junior Member
Date registered: Jul 2008
Vehicle: W107 350SL 1971, CLK 200 W208
Location: Warsaw, Poland
Posts: 20
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Originally Posted by rsparso View Post
Anyone have the part # for the switch ?

thats the number on my old switch. Hope it helps.
iceman350SL is offline  
post #6 of 11 (permalink) Old 09-07-2012, 06:47 AM
BenzWorld Junior Member
Date registered: Jul 2008
Vehicle: W107 350SL 1971, CLK 200 W208
Location: Warsaw, Poland
Posts: 20
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
as promised,

Had the part replaced after the light ( ASR BAS )on the dash kept lighting up all the time. I checked these forums and determined that it was in fact the brake switch. Had it done at my local car guy on wednesday and it worked !!!
iceman350SL is offline  
post #7 of 11 (permalink) Old 08-03-2015, 03:10 PM
BenzWorld Newbie
Date registered: Aug 2015
Vehicle: 1999 Mercedes CLK 320
Location: USA
Posts: 1
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
I have a 1999 Mercedes CLK 320.

ASR/BAS lights on the dash stays on. Does anyone have any suggestions?

I replaced brake light switch, brake booster, and Brake Module.

Took car to dealer who performed diagnostic test and said the problem is the brake module. I replaced it twice but lights are still on.

I would appreciate your help.

cleharris1 is offline  
post #8 of 11 (permalink) Old 12-29-2015, 08:38 PM
BenzWorld Newbie
Date registered: Dec 2008
Posts: 1
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
You sir, saved me hundreds ($$$) last week. My 2000 SLK 230 gave me the same indications. One swift visit to Nextdayauto and I had the switch replaced within 48 hours for less than $25 (w/shipping)! I now know I can contort into a pretzel (mirror free) and complete the job blood-free and most importantly, dealer-free!! Happy New Year my friend!
kprent97 is offline  
post #9 of 11 (permalink) Old 12-30-2015, 12:03 AM
Outstanding Contributor Always Remembered RIP
television's Avatar
Date registered: Sep 2005
Vehicle: 216 with everything. 2002 SL500 with everything. 2009 SL500 with everything.
Location: South coast .England
Posts: 6,543
Mentioned: 1 Post(s)
Quoted: 150 Post(s)
What happens with these switches is they can kill the speed signal within the ESP ECU, many assume that because the brake lamps work, it cannot be part of the problem.

Applies to 202,203,208,209,210,211,215,219,220,230


"I thought my vasectomy would keep my wife from getting pregnant but apparently it just changes the color of the baby."
television is offline  
post #10 of 11 (permalink) Old 05-22-2019, 01:53 PM
BenzWorld Junior Member
3dogsrock's Avatar
Date registered: Sep 2018
Vehicle: 2000 CLK 320 Convertible (Work In Progress)
Location: I currently live in Reno, Nevada
Posts: 19
Mentioned: 0 Post(s)
Quoted: 4 Post(s)
My ABS, ESP and BAS lights have been on since I purchased my CLK 320 Convertible A208 a year ago. I have tried everything mentioned in these forums. So, I purchased a Craftsman 1681 scan tool, it is the same as an Innova 5100. Both of these are compatible with my vehicle and should read the ABS codes. The scanner will read everything else on the vehicle, however, when I ask it to read ABS codes it tells me that I am not connected to the vehicle!. I am connected because I just ran a full diagnostic! Called support and they have no idea except to say that my vehicle is not communicating with the scanner when checking ABS. Any help in this issue would be appreciated.
3dogsrock is offline  
Sponsored Links

  Mercedes-Benz Forum > Mercedes-Benz Coupe/Convertible Forums > C208/A208 CLK-Class

Quick Reply

Register Now

In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Topic Author Forum Replies Last Post
2005 c230 Alternator warning light and ESP warning light Oaklandish W203 C-Class 11 04-06-2013 09:57 AM
Flashing low fuel warning light and check engine light. BErbach W210 E-Class 9 11-14-2012 07:33 AM
Quick question about warning lights decampos R/C107 SL/SLC Class 21 09-01-2010 04:29 PM
Stop light and exterior light warning indicator tempoct R170 SLK-Class 8 06-16-2004 03:17 PM
Park Brake warning Light and Low fuel warning light Ameet Patel R170 SLK-Class 3 03-21-2001 03:28 PM

Posting Rules  
You may post new threads
You may 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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Title goes here

video goes here
description goes here. Read Full Story
For the best viewing experience please update your browser to Google Chrome