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  #1  
Old 04-19-2007, 01:26 PM
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Join Date: Nov 1999
Location: North Grafton, MA USA
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Exclamation Help! Very weird problem.

I've got a weird problem that my indie has not been able to figure out, hopefully someone can give me some direction.

My remote locking system stopped working some time ago. I press the remote and I can see the red/green alarm lights go on, but the doors will not lock/unlock. I have tried to resync the key but it makes no difference. Batteries are new.

The drivers side door, when using the key will unlock the car, but will not lock it. The lock button on the dash console will unlock and lock the doors. The trunk lock will not lock/unlock the car.

So my indie at first thought it was the drivers side door latch, but more recently he thinks it may be the lock control module in the trunk. He is hesitant to change it because he thinks he might need some kind of reprogramming for the key that only the dealer can do.

Anyone have any idea if it might be indeed the door latch, or the control module where I should start to look?

The control module is fairly inexpensive and I am tempted to just get it and see if it works, does anyone know if I can just replace it, or does it need to be programmed to match my key? And if so does the dealer only do this, or can my indie do it?

Unfortunately I am stuck with a dealer in my area that loves to run up the bill with diagnostic labor, I've had jobs performed by my indie for 25% or less than the quoted price of the dealer. If I have to I will take it to the dealer, but would rather avoid it.

It's a 96 SL500

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Last edited by spinedoc; 04-19-2007 at 04:24 PM.
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  #2  
Old 04-19-2007, 08:10 PM
88Black560SL
 
Join Date: Oct 2004
Location: CT
Posts: 3,510
Well I dont belive the vacume lock need reprograming but here is one for sale on E-bay.

http://cgi.ebay.com/ebaymotors/Mercedes-Central-Vacume-Pump-129-SL500-SL600-SL320_W0QQcmdZViewItemQQcategoryZ6763QQihZ015QQitemZ250103311009QQtcZphoto
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Old 04-19-2007, 11:22 PM
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Location: Milwaukee Wisconsin
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Fuse numbers 5 and 6 in the trunk fuse block. Don't just look at them, check with a meter. If the fuse is good then check for 12 volts on the block terminals.
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Old 04-20-2007, 09:42 AM
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Thanks guys. It's not the vacuum pump as the locks work fine with the console switch. I'm still assuming its the locking computer, although I have no idea.

Tecqboy I did check those fuses, they get good 12v.
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Old 05-04-2007, 08:25 AM
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I'm surprised no one at least knows where to start! Anyone?
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  #6  
Old 05-04-2007, 07:28 PM
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dont feel alone i have the exact problem on my 1996 600sl, i will let you know if i find the answer the only difference i see is that i have no response from the rear view mirror lights.
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  #7  
Old 05-19-2007, 07:45 AM
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Location: New Jersey
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problem solved

my problem was the fuse which activates the i/r remote on the rear view mirror. i believe it was number 14.

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