02 C240 ABS Module and possible rear SAM issues - Mercedes-Benz Forum
 
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post #1 of 6 (permalink) Old 09-07-2016, 12:01 PM Thread Starter
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02 C240 ABS Module and possible rear SAM issues

All,

I recently purchased a 2002 C240 that needs a little love. Exterior and Interior are in great condition and after a Crank sensor change it runs fairly well but I have a few more niggly bits to sort out. The main 2 are:

1) The ABS motor runs continuously, key on, key off and car running.
2) Because of the above I think it was boosted to many times because the fuel guage, sunroof, interior lights and opening the trunk with the FOB are all inoperative.

I'm thinking that the ABS Controller has a bad relay or something inside causing it to run non-stop (I've pulled the main fuse) for now.

I found a 2004 C240 with 80k on it at a local parts yard and I'm wondering if the SAM, ABS Controller and Guage cluster are interchangeable (my display panel is illegible). If the SAM is interchangeable will the it need to be re-programmed?

Am I on the right track here?

Thanks,
Bob
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post #2 of 6 (permalink) Old 09-07-2016, 01:01 PM
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I replaced my rear SAM with one from ebay. It fixed all my rear (taillights) lighting problem. Just swapped it out, no programming needed.
My original problem was only 1 rear light worked. All others dead; brake, parking, running, license plate etc etc.
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post #3 of 6 (permalink) Old 09-07-2016, 01:43 PM Thread Starter
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Great to know, thanks.

I think I've answered the compatibility questions from the 2004. Rear SAM and Instrument cluster = yes. ABS Module = no. He's willing to sell be both of those for $90 so I'll take a chance on that. I'll have to keep digging for the ABS Module.
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post #4 of 6 (permalink) Old 09-07-2016, 06:46 PM
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If you want to keep your odometer, instrument clusters cannot be swapped. The cluster is "married" to the car, and when you swap with a used one, it can't even be coded to re-marry it. Only "virgin" zero-mileage clusters can be married to a car. it is possible to take a used cluster and zero the mileage in its EEPROM, then use SDS to marry it (it will think it's a virgin). I have personally done this, but that is NOT an easy task - it's micro-surgery on tine electronic parts inside the cluster. I ruined more than one cluster.

As for swapping SAMs, that is possible. however, unless the SAM comes form a car with the exact same options and configuration as yours, it will need re--coding with SDS. Also, during MY2002, there was a change in the fuel sender. This requires a matching SAM and sender unit. So, if you have the old sender, and get a newer SAM (or vice-versa), the fuel gauge won't work. Also, the cluster must match, but some (not all!) clusters can be coded to match the old vs. new sender signals for its gauge.

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post #5 of 6 (permalink) Old 09-08-2016, 12:46 PM Thread Starter
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Thanks Rodney.

I picked up the cluster today because I really just need to replace the bezel. I'll test the center display board and if it's better than mine I'll swap it over to my cluster as well. That should by-pass the marrying issues.

Based on what you're saying and the fact that I think my VIN (F159617) is an early model 2002 I passed on the SAM. I'll have to see if I can find one at a salvage yard that might be a better match. I'm having a hard time justifying paying almost as much for a replacement SAM (with install and programming) as I paid for the car from one of the local Indie shops.

Thanks,
Bob
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post #6 of 6 (permalink) Old 10-08-2016, 05:44 AM Thread Starter
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Just wanted to post an update. Turns out someone unplugged half of the plugins in the overhead console. To resolve most issues I did the following:
- Plug everything back in and reset and sunroof which also fixed the auto headlights and interior light issues. Rain sensor still inop.
- had the local indie Benz guy replace a HVAC pressure switch and recharge.
- harvested the bezel, MFD and trunk release motor from the 04.
- replaced the ABS controller with a used ebay unit

All in all I have a pretty clean car with 125k on the odo for under $1600. The search function has been an immense help.
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