SL/R230: Suggestions to re-vive a keyless go system
Thread Starter
Junior Member
Joined: May 2017
Posts: 61
Likes: 11
From: South West
2003 SL55, 2004 E320 CDI Estate
Suggestions to re-vive a keyless go system
Hi all, I've recently bought an 03 SL55. It's in great condition and I'm planning some preventative maintenance in the next few weeks. It has keyless go from the factory but it's completely not working. When the button is pressed on either the doors or shifer there is nothing. The previous owner said it never worked and he never tried to fix it.
I've been looking for the fuse, the fuse locations don't seem to match the diagram I found online as the car is a euro right hand drive. However every 7.5 amp fuse I've pulled looks fine. I've tried disconnecting the battery but no difference, I'm going to look for the relay next and try swapping it with another one to see if that makes a difference. I don't have star (but plan to buy a chinese clone) but I do have the iCarsoft MBII reader. However it cannot see the keyless module at all.
I'm thinking either the keyless has been coded out of the car (due to faults I would assume) or that there is no power to the module. I remember reading somewhere if the system has multiple faults it just shuts down but might be remembering that wrongly. I would also assume if that was the case you could still connect to it from the MBII reader.
The only other electrical issues are the CD player auto changer is dead, and the radio reception is a bit poor. Not sure if this is relevant.
My key batteries are both new.
Any ideas are welcome. I'm considering buying a star clone but I'm somewhat confused as to exactly what to order.
I've been looking for the fuse, the fuse locations don't seem to match the diagram I found online as the car is a euro right hand drive. However every 7.5 amp fuse I've pulled looks fine. I've tried disconnecting the battery but no difference, I'm going to look for the relay next and try swapping it with another one to see if that makes a difference. I don't have star (but plan to buy a chinese clone) but I do have the iCarsoft MBII reader. However it cannot see the keyless module at all.
I'm thinking either the keyless has been coded out of the car (due to faults I would assume) or that there is no power to the module. I remember reading somewhere if the system has multiple faults it just shuts down but might be remembering that wrongly. I would also assume if that was the case you could still connect to it from the MBII reader.
The only other electrical issues are the CD player auto changer is dead, and the radio reception is a bit poor. Not sure if this is relevant.
My key batteries are both new.
Any ideas are welcome. I'm considering buying a star clone but I'm somewhat confused as to exactly what to order.
Last edited by Rawhide; Sep 20, 2019 at 05:51 PM.
Thread Starter
Junior Member
Joined: May 2017
Posts: 61
Likes: 11
From: South West
2003 SL55, 2004 E320 CDI Estate
However surely that doesnt explain why I cannot connect to it, nor get an error message when I press any of the buttons?
Hi all, I've recently bought an 03 SL55. It's in great condition and I'm planning some preventative maintenance in the next few weeks. It has keyless go from the factory but it's completely not working. When the button is pressed on either the doors or shifer there is nothing. The previous owner said it never worked and he never tried to fix it.
I've been looking for the fuse, the fuse locations don't seem to match the diagram I found online as the car is a euro right hand drive. However every 7.5 amp fuse I've pulled looks fine. I've tried disconnecting the battery but no difference, I'm going to look for the relay next and try swapping it with another one to see if that makes a difference. I don't have star (but plan to buy a chinese clone) but I do have the iCarsoft MBII reader. However it cannot see the keyless module at all.
I'm thinking either the keyless has been coded out of the car (due to faults I would assume) or that there is no power to the module. I remember reading somewhere if the system has multiple faults it just shuts down but might be remembering that wrongly. I would also assume if that was the case you could still connect to it from the MBII reader.
The only other electrical issues are the CD player auto changer is dead, and the radio reception is a bit poor. Not sure if this is relevant.
My key batteries are both new.
Any ideas are welcome. I'm considering buying a star clone but I'm somewhat confused as to exactly what to order.
I've been looking for the fuse, the fuse locations don't seem to match the diagram I found online as the car is a euro right hand drive. However every 7.5 amp fuse I've pulled looks fine. I've tried disconnecting the battery but no difference, I'm going to look for the relay next and try swapping it with another one to see if that makes a difference. I don't have star (but plan to buy a chinese clone) but I do have the iCarsoft MBII reader. However it cannot see the keyless module at all.
I'm thinking either the keyless has been coded out of the car (due to faults I would assume) or that there is no power to the module. I remember reading somewhere if the system has multiple faults it just shuts down but might be remembering that wrongly. I would also assume if that was the case you could still connect to it from the MBII reader.
The only other electrical issues are the CD player auto changer is dead, and the radio reception is a bit poor. Not sure if this is relevant.
My key batteries are both new.
Any ideas are welcome. I'm considering buying a star clone but I'm somewhat confused as to exactly what to order.
I also posted a keyless go thread
https://mbworld.org/forums/cl-class-...onversion.html
PM me
Senior Member
Joined: Nov 2016
Posts: 271
Likes: 23
From: Kirkland, WA
2003 SL500
Hmm - my car is an 03. I contacted MB and they told me that they could create a new key for me (when I was doing some research) and said it was a key based system and not the card. They could be wrong and i can try again now I have the chassis number.
However surely that doesnt explain why I cannot connect to it, nor get an error message when I press any of the buttons?
However surely that doesnt explain why I cannot connect to it, nor get an error message when I press any of the buttons?
Thread Starter
Junior Member
Joined: May 2017
Posts: 61
Likes: 11
From: South West
2003 SL55, 2004 E320 CDI Estate
Joined: Nov 2016
Posts: 7,847
Likes: 3,498
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Run your VIN through www.datamb.com and make sure keyless go was really an installed option. FWIW, I coded out keyless go on my car, but it still works.
Last edited by JettaRed; Nov 5, 2019 at 11:46 AM.
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Run your VIN through www.datamb.com and make show keyless go was really an installed option. FWIW, I coded out keyless go on my car, but it still works.
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Thread Starter
Junior Member
Joined: May 2017
Posts: 61
Likes: 11
From: South West
2003 SL55, 2004 E320 CDI Estate
Run your VIN through www.datamb.com and make show keyless go was really an installed option. FWIW, I coded out keyless go on my car, but it still works.
Thread Starter
Junior Member
Joined: May 2017
Posts: 61
Likes: 11
From: South West
2003 SL55, 2004 E320 CDI Estate
After that I will replace the module, then see if coding is required as a last resort.
Joined: Nov 2016
Posts: 7,847
Likes: 3,498
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Joined: Nov 2016
Posts: 7,847
Likes: 3,498
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Never got rid of the chime, but I did add a Workshop warning message. 🤪 Seems to have no effect on the Keyless Go function.
