Mercedes-Benz Forum - View Single Post - CLK... ABS/BAS/ASR Warning Light QUICK FIX HERE
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post #1 of (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)
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