SL/R230: Keyless Go problem
Thread Starter
Junior Member
Joined: Aug 2025
Posts: 16
Likes: 0
From: Michigan
2007 SL550
Keyless Go problem
Purchased a 2007 SL550 back in May and quickly fixed a couple of minor annoyances. A bigger annoyance, however, is the non-functional Keyless Go, which has me stymied. The key works well for locking and unlocking and starts the car when inserted, but the start button on the shift lever does nothing. Is there a common trouble-shooting routine for such a problem?
Any suggestion or advice will be welcomed.
Thanks.
Any suggestion or advice will be welcomed.
Thanks.
Super Member
Joined: Oct 2012
Posts: 538
Likes: 89
From: Hollywood, CA
W209, W124
There is a fuse somewhere, start there.
Do you know for a fact that the key you have used to work with KLG?
It is possible that the key itself isn’t really KLG.
If you pull the PCB out of the key, from pix we can tell you. NKLG keys have just one copper wound inductor. KLG keys have 2 or 3 and much more crowded circuitboard. Early KLG required use of a card with the key. By 2007 should be just a key. (Oval panic button)
If panic button is a triangle, those don’t come apart if OEM.
If you only have 1 key, might be time to find a clever locksmith who can make a KLG 2nd key.
Do you know for a fact that the key you have used to work with KLG?
It is possible that the key itself isn’t really KLG.
If you pull the PCB out of the key, from pix we can tell you. NKLG keys have just one copper wound inductor. KLG keys have 2 or 3 and much more crowded circuitboard. Early KLG required use of a card with the key. By 2007 should be just a key. (Oval panic button)
If panic button is a triangle, those don’t come apart if OEM.
If you only have 1 key, might be time to find a clever locksmith who can make a KLG 2nd key.
Last edited by MacVidMB-V8; Sep 9, 2025 at 02:27 PM.
MBWorld Fanatic!
Joined: Aug 2005
Posts: 3,085
Likes: 59
From: Los Angeles
2009 SL550 Roadster Diamond White, 2008 CLK550 Coupe Obsidian Black
It may be a new key that was programmed to the vehicle. The keys come programmed when ordered for DAS and EIS, but not KeylessGo, that part needs to be done by the dealer. I had the same issue after buying a car with a new spare remote the dealer ordered, but did not program.
Super Member
Joined: Oct 2012
Posts: 538
Likes: 89
From: Hollywood, CA
W209, W124
The MB keys with triangle panic button have 1 battery. The MB keys with oval panic button have 2 batteries. If 3rd party, all bets are off.
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MBWorld Fanatic!
Joined: Aug 2020
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From: Gretna, NE
'03 SL55 Black, '03 SL500's Aegean, Mars Red, Tazanite, Alabaster, '11 S550 Flint Gray
You are just flying blind without diagnostics. It could need key tracks reprogrammed, have a bad KG module, or a number of other things. Very rare to see a used R230 with 2 keyless go keys. Why do you think that they are keyless go keys?
Thread Starter
Junior Member
Joined: Aug 2025
Posts: 16
Likes: 0
From: Michigan
2007 SL550
I recognize that the cause of the problem could be any number of things, including the after-market remote start/gate opener system installed. Trying to eliminate one problem at a time.
Super Member
Joined: Oct 2012
Posts: 538
Likes: 89
From: Hollywood, CA
W209, W124
Ok, those are the sort of details that should have been in first post.
1. You have 2 keys, neither working with KLG. Apparently they look different?
2. Someone added a “remote start and gate opener” feature. Do you know brand? There are about a million ways that could cause issues.
1. You have 2 keys, neither working with KLG. Apparently they look different?
2. Someone added a “remote start and gate opener” feature. Do you know brand? There are about a million ways that could cause issues.
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Joined: Nov 2021
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From: North West England
SL500
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From: Baltimore County, MD
'13 s212 63 p30. '06 LX470
Xentry/das would point to your problem. As mentioned it can be key programming. It could also be the keyless go antennas or a module itself. I’m assuming no keyless doorhandles work either? Das with developer would get you through the repair in my opinion. When I went through something similar on an E 55 it was determined that the keys were not keyless go keys so I had to get a new key and after that I was able to do all of the repair diagnostics. In my case, all modules were working.
