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Old 03-25-2002, 10:54 PM
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Join Date: Mar 2002
Posts: 56
Unhappy Factory Alarm System on 300E

Sometimes the factory alarm goes off immediately when I lock the door(s) on my '92 300E. It doesn't matter whether I lock the trunk or either front doors. Currently, the problem is intermittent. Any insights?

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Old 03-25-2002, 11:30 PM
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Not to insult you, but I'll ask the dumb question first. Are you using the valet key when the alarm goes off?
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Old 03-25-2002, 11:32 PM
KNanthrup's Avatar
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Join Date: Mar 2002
Location: Issaquah, WA
Posts: 180
mine does the same and i wasnt sure because my car hadn't come with an owners manual. mine will still go off if i unlock my doors by turning the key to the right, and will occasionally do it even when turning it the right way to unlock it. never really made a big deal out of it but it does have some of my curiousity. i plan on hopefully getting keyless entry and remote start on it fairly soon anyways
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Old 03-25-2002, 11:32 PM
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Old 03-25-2002, 11:42 PM
pmizell's Avatar
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Join Date: Jun 2001
Location: Houston, Texas
Posts: 838
I had the same problem and noticed that it occurred when one of my doors or trunk was slightly ajar when I locked the car. But this doesn't explain your problem being intermittent unless the door/trunk you are locking itself is ajar.

For keyless entry, here's a DIY thread from awhile back:

I did it! Keyless entry for your 124 made easy (and less than $100)!

Good luck..


'91 300E, 208k miles

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