C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

MB God please help me!!

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Old Mar 19, 2018 | 08:57 PM
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Mercedes Benz C180 203
MB God please help me!!

My Mercedes Benz C180 203 has suffered from a flat battery..
The battery is fairly old and I left my lights on resulting in it going flat..
I have purchased a new battery..
Everything is working (lights,windows,cluster etc.) except the car won’t start or even crank ):
any help is greatly appreciated
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Old Mar 19, 2018 | 10:41 PM
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Did you connect positive to the battery first? If you connected negative first, you might've blown something.
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Old Mar 19, 2018 | 10:44 PM
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Thanks for reply mate..Yes I’m aware that might cause an issue..
luckily with all vehicles when removing battering I always remove positive first then the negative.
and replacing battery negative before positive.
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Old Mar 19, 2018 | 10:45 PM
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Just read your comment properly 😩😩😩
no I connected negative first
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Old Mar 19, 2018 | 11:58 PM
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^ Shoot. You may be screwed. For these cars it is mandatory that positive is connected first. Check your fuses. Hopefully your front SAM isn't blown.

Last edited by slammer111; Mar 20, 2018 at 12:21 AM.
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Old Mar 20, 2018 | 12:05 AM
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Do you know which fuses I am looking for off the top of your head? And it’s a manual would I be able to roll start it to get it home?
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Old Mar 20, 2018 | 12:24 AM
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I wouldn't be able to tell you off the top of my head. However there is a fuse box map. For the front SAM it would be either in the manual or inside a folded up paper slip inside the dash. To access this piece of paper, peel back the side panel of the dash, above your L knee (when sitting in the driver's seat) and behind the headlight switch. I assume your car is LHD.

Does the steering wheel lock disengage when you stick the key in? If it does, I would imagine the car can be push started as it sounds like the car is at least recognizing the key.
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Old Mar 20, 2018 | 01:47 AM
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Check starter fuse, 50 something! Connecting the negative first will have no effect on the systems
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Old Mar 20, 2018 | 02:04 AM
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Where are you based Benjamin?
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Old Mar 20, 2018 | 02:32 AM
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Thank you...It’s a RHD.. where is the piece of paper exactly where you are talking about? I know where the fuse box is on the side of the dash that is about it.. I live in Australia

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Old Mar 20, 2018 | 02:33 AM
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I checked starter fuse it looks fine..
I’m thinking maybe the starter motor relay might have went? No sure which one it is..
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Old Mar 20, 2018 | 05:23 AM
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I just tried to roll start it, it didn’t even try to turn over ):
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Old Mar 20, 2018 | 04:46 PM
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Starter relay, (if it is) bang with a piece of pipe, it will start.
In my case, a 3 ft piece until I got it fixed.
Also any time you put in a new part, and then have problems that could be
attributable to that part, don't assume the new part isn't bad.
Pull the battery, and have it tested.

Last edited by C230 Sport Coup; Mar 20, 2018 at 04:53 PM.
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Old Mar 20, 2018 | 10:12 PM
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Bang the actual relay ? Or starter motor?
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Old Mar 20, 2018 | 10:20 PM
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Battery has been tested it’s putting out 12.6V
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Old Mar 20, 2018 | 10:45 PM
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I believe the starter relay is S in the front Sam is this true and if it is.. is there one I can swap with it to test to see if if the relay has gone?
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Old Mar 21, 2018 | 01:34 AM
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Update:
Replace Fuse 52 (1.5amps) with a yellow 20amp fuse car is still not cranking..
checked starter relay switched it seems to be fine.

any other ideas people?
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Old Mar 21, 2018 | 02:02 AM
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It's a folded paper that slides into the fuse box on the side of the dash
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Old Mar 21, 2018 | 02:02 AM
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I think it’s missing
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Old Mar 21, 2018 | 02:05 AM
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Originally Posted by C230 Sport Coup
Starter relay, (if it is) bang with a piece of pipe, it will start.
In my case, a 3 ft piece until I got it fixed.
Also any time you put in a new part, and then have problems that could be
attributable to that part, don't assume the new part isn't bad.
Pull the battery, and have it tested.
you obivously mean bang the starter motor don’t you?
in my case on this car I don’t think accessible from top..I would have to remove the cover underneath the vehicle
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Old Mar 21, 2018 | 02:17 AM
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Look for the 3 pin plug clipped on at the airmass sensor, find the violet wire. That wire goes to solenoid of the starter. Check for 12v there when you crank.
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Old Mar 21, 2018 | 02:20 AM
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Originally Posted by Russell Ormerod
Look for the 3 pin plug clipped on at the airmass sensor, find the violet wire. That wire goes to solenoid of the starter. Check for 12v there when you crank.
thank you Russell will try that..
location of sensor please?
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Old Mar 21, 2018 | 02:45 AM
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Originally Posted by Russell Ormerod
Check starter fuse, 50 something! Connecting the negative first will have no effect on the systems
Not true at all. For these cars it is MANDATORY to connect positive first. Many have cooked their front or rear SAMs by not doing so, and that's when all these weird problems suddenly pop up. Not sure about the starter specifically, but people have permanently lost the usage of headlights, wipers, and turn signals among other things after a battery change by connecting the wrong wire first.

Why MB designed their electronics to be so easily fried is completely beyond me. Keeps the parts department busy I guess.

Last edited by slammer111; Mar 21, 2018 at 03:15 AM.
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Old Mar 21, 2018 | 02:48 AM
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Originally Posted by slammer111
Not true at all. For these cars it is MANDATORY to connect positive first. Many have cooked their front or rear SAMs by not doing so.

Why MB designed their electronics to be so easily fried is completely beyond me. Keeps the parts department busy I guess.
everything else seems to be operation except for the car starting.. it won’t even crank.. how will will I know if Sam is damaged any symptoms!?
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Old Mar 21, 2018 | 02:49 AM
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Originally Posted by Harold1898
Where are you based Benjamin?
Australia Mate
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