2004 SLK 230 problem: BAS/ESP light on; shifter stuck in park - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 09-04-2008, 10:05 AM Thread Starter
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2004 SLK 230 problem: BAS/ESP light on; shifter stuck in park


I have a 2004 SLK 230, 40K miles. While driving, a BAS/ESP light came on. Next morning, couldn't shift out of park. Brake lights don't work when the brake pedal is depressed. Car is undriveable, stuck in the garage.

MB shop told me to have it towed because it could be "a variety of serious problems".

I received some sensible advice here to pull and reinstall a stop lamp switch as an easy remedy. Problem is, I don't have a service manual, and don't have any schematics for removing under-dash covers and getting to the switch. Tried to look for the switch this morning, and failed miserably. Plastic covers go all the way to the floor, it seems.

To your knowledge, are all SLK stop light switches similar? There was a stop lamp switch schematic in the forum, and I wonder if the adjustment procedure is the same for all SLKs (unplug S9 connector, press S9b catch, pull pin S9a all the way out, reinstall). Should I get a new part, or clean and reinstall the old one?

Also, couldn't find any fuses for the traction system in the fuse box. Could it be a blown fuse, and if so, which fuse do I need to inspect?

Your advice is greatly appreciated. Certainly don't want to have this towed.

Thanks, and best regards,

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post #2 of 3 (permalink) Old 09-04-2008, 01:21 PM
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Hi, Russ.

The switch is very cheap, even at the dealer only about $20, and they fail more often than they should. So I'd say don't try adjusting, etc., just replace the thing. That should resolve both issues.

Take care and enjoy the ride,

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)
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post #3 of 3 (permalink) Old 09-05-2008, 06:46 AM
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The brake switch is located close to the top of the brake pedal. You will have to remove a small plastic access cover to get to it. Once you find the switch, depress the brake pedal & notice if the switch plunder moves. If it does not, try to move the plunger by hand to free it. They get stuck in the off position. This has happened to me a few times, so I keep the plastic access window off so I can free the switch if needed.

You can also attempt to free the jammed switch by "snapping" the brake pedal -- depressing it and than sliding your foot off to one side.

One other thing to note is that the transmission can be switched into gear by inserting a pen into a small access hole located right next to the shifter. This emergency procedure is explained in the Owner's manual.

Good luck.

Last edited by Andrzejek; 09-05-2008 at 06:50 AM.
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