On my '87 300TD, factory alarm. Seams that the alarm won't turn off from the drivers door since we had the Ice storm and single digit temps. I can still turn it off from the passenger side though.
I just figured that it could have gotten moisture in there and frose so it wouldn't make contact. But, I am unfimiliar with what makes it work in the door. Is there anything I can spray in there to loosen it up, or is something just broken? Any ideas???

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1987 MB 300TD, 245,000 miles running great, converted to WVO.
1996 Ford F350 2WD,PSD,CC,DRW custom conversion, soon to run on WVO.
2003 Toyota Matrix,4WD (wifes)

I think the alarm is armed/disarmed by a microswitch connected to the key tumbler. For some reason, the key is not operating the switch.

Could be moisture, try a hair dryer to warm up the key/lock area? Park in a warm area?

DON'T use WD-40, it's not lock friendly.

Best Regards,
Jim

Thanks didn't know what activated/deactivated the alarm, so it is a possibility that the microswitch is bad also. I will try putting some heat to it, but parking somewhere warm will not be possible till spring.

__________________
1987 MB 300TD, 245,000 miles running great, converted to WVO.
1996 Ford F350 2WD,PSD,CC,DRW custom conversion, soon to run on WVO.
2003 Toyota Matrix,4WD (wifes)