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Old 07-30-2003, 12:10 AM
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Join Date: Feb 2002
Location: Bay Area, CA
Posts: 47
Jump Start Car = Major Problems ?

My car battery was weak recently and I had jump started my 1999 SLK230 several times. I thought I had fixed the problem by charging the battery , but it died again, and this time when I jumped it, the idle kept surging between 1000-1300 rpms and there was no response from the throttle. I have searched the archives and have already tried disconnecting the battery. I have also used an OBDII scanner to pull codes and didn't get any. The BAS and ASR lights are both on. I am at a loss to what may be causing this problem, but am afraid to bring it in to the dealer because I know they will just start replacing parts. Has anyone experienced this in there cars or knows of the cause and more importantly, the fix?
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Old 07-30-2003, 03:33 AM
sunil190e-1.8's Avatar
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Join Date: Jun 2002
Location: uk
Posts: 236
when you state BAS do you mean the ABS light?

If so then ,it is likely that the OVP(overvoltage protection relay) is faulty.-check the fuses on it-if blown, replace them,if the problem still persists ,then the the relay itself is faulty.

sorry, but do not know where the relay is located,maybe someone else will be able to help.
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Old 07-30-2003, 11:09 AM
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Location: Bay Area, CA
Posts: 47
Thanks for the reply. However, I did mean BAS. I believe it stands for Brake Assist System. I also checked and found out that this vehicle does not have an OVP. I am at a loss to what could be causing this problem. Any other ideas? Please help. Any input from the techs would be greatly appreciated. I cannot apply gas at all, even if I floor the gas pedal. The problem still persists this morning. I also tried turning the wheel from lock to lock to reset anything, but that didn't help.
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Old 07-30-2003, 03:58 PM
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Join Date: May 2002
Posts: 40
basics first

Have your battery tested by autozone asap... try using a known good battery in the meantime and if you can get it started get the alternator tested at autozone as well. Check your ground wires. Hopefully it is just a bad battery made worse by jumping.. wild tach fluctuations can mean the alternator is going as well.
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Old 07-30-2003, 04:05 PM
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Location: Bay Area, CA
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I'm sorry, I forgot to mention that I replaced the battery with a brand new MBZ battery and the pro blem still persists. Anyone?
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Old 07-30-2003, 04:56 PM
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I am guessing on this soooo..

I speculate that the battery jump caused a voltage spike/ or current surge within the system, in todays newer computer controlled vehicles, it is similiar to a surge in the home that shuts down the home PC.

From reference material:

On most models the BAS and the ABS are integrated. On models 168 the voltage is supplied to the BAS control module ( N48) via the fuse relay box (F1). Check this fuse and relay.

On models 129,140 it is supplied via the base module ( N16/1), on models 163,170,202,208, 210 and 220 via the relay (K40). Check these for voltage, shorts,opens etc.

Hope this helps, if further clarification is needed I can dig into more reference material.
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Old 07-30-2003, 05:16 PM
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Location: Bay Area, CA
Posts: 47

Thanks for the reply. Would you happen to know where this relay is located?

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Old 07-30-2003, 05:53 PM
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Not having much luck finding it on a schematic and I'm running out of time here at work

I'll look more tomorrow.
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Old 07-30-2003, 06:27 PM
blackmercedes's Avatar
Just a guy
Join Date: Dec 2000
Location: St. Albert, Alberta, Canada
Posts: 3,492
I can't help with the problem, but I hope folks reading the thread take note of what caused the difficulty: Boost-starting a late model computer equipped vehicle.

I owned an auto-electronics store and boosting a car meant you were instantly unemployed. No second chances. We paid out too much money to replace electronic brain devices on cars.
John Shellenberg
1998 C230 "Black Betty" 240K
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Old 07-30-2003, 10:38 PM
SteveStromberg's Avatar
Join Date: Apr 2003
Location: Niewport Beach Calif
Posts: 54
When jumping a car you need to turn on the headlights in BOTH cars this will absorb any Voltage spike. Steve
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Old 07-31-2003, 07:26 AM
wjm's Avatar
wjm wjm is offline
Join Date: Dec 2000
Location: Suburban Detroit, MI
Posts: 692
Thanks Steve,

So, the answer to "how to jump a Mercedes correcty" is to turn both vehicle headlights on, eh?

I'll have to remember that one. I mean, you gotta do SOMETHING if you're out there in the middle of nowhere with a bad battery.
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Old 07-31-2003, 07:59 AM
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Join Date: Jun 2003
Posts: 123
I also have learned the hard way with jumping -- thankfully the car a Jeep GC was still under Warr. -- it was about 6 months old and I was using it to Jump another car -- I did think that this was even safer, although I do not now how I got that idea.

After that, I purchased one of those jumper batteries -- the thing is great -- we keep it in the office -- it has saved us many times over the years.

We have also used it when changing a weak batt - to keep all the memory chips powered.
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