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Old 03-04-2002, 05:40 PM
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Originally posted by sixto
MB got rid of the dot before 91. My 91 didn't come with a dot key.

91 300SE
81 300SD
Thanks Sixto, I was starting wonder what this red dot deal was :p
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Old 03-04-2002, 07:06 PM
Registered User
Join Date: Apr 2001
Location: Central Oregon
Posts: 91

I only requested two new keys.
I called them just now to confirm.
They no longer put the red dot on them.
But when you order from MB direct, they are properly keyed/stamped to work the factory alarm.

Start with a good key (mine were pretty worn when I compared side-by-side). If you order from the dealer, and you still have problems with your "factory" alarm, then it probably is in the locking mechanism. In my case the new keys solved the problem ..... for now.
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Old 03-04-2002, 08:13 PM
dpetryk's Avatar
Electrons can do anything
Join Date: Sep 2001
Location: Houston, Texas
Posts: 1,071
Ok guys - forget the red dot. It has nothing to do with it. There is a set of contacts near the locks on the front doors. These contacts are not making good contact. Just replace it or clean them. They are used to arm and disarm the alarm.

The red dot is only plastic. It has nothing to do with the alarm system.
I got too many cars!! Insurance eats me alive. Dave

78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k
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Old 03-09-2002, 08:26 PM
MikeTangas's Avatar
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Join Date: Apr 2000
Location: So. Cal
Posts: 4,430
Beep, beep, beep

I picked up my replacement keys from the dealer today. Soon as I got home I pulled the passenger footwell to ensure the alarm was still connected, then set about playing with the keys.

Using the new key I followed the test in the manual and the alarm goes off - horns honking lights flashing, little kids covering their ears and running off . Unlocking the door disarms the alarm. Alarm sets from driver's door, passenger door and the trunk. I couldn't disarm at the trunk though, will study up on that one. I also, sat inside, locked the door through the open window and then tried starting the car with the old key, alarm went off but the car started. I guess it might draw some attention toolin' down the road with light flashing and horn honking though.

Tried the same test again using the old key (brass after market), no arming of the alarm. It also will not disarm the alarm.

Not sure what the difference the key makes, but now I have a working alarm.
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon least its a diesel

Non illegitemae carborundum.
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Old 03-09-2002, 10:08 PM
Posts: n/a
Sounds good Mike,

Now did you try yanking out the Becker? :p

I'm not sure if the car is supposed to kill if you attempt start it with the "window down, doors locked scenario" (?)
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