This morning, I went to open the car door and at the same time my wife opened the passenger door....

the alarm started sounding...and we couldn't get it to stop without locking the car. Locked it started it and the alarm started again..

Left the car and took the other to church.

A couple of hours later I went out to try and solve the issue...

....now no alarm and no start...... the starter won't crank at all...

Battery seems to be fine.....

unplugged the footwell becker module.... it unplugs in two spots...

....no difference

__________________
1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


[/SIGPIC]

AFAIK the alarm system in Mercedes of this vintage don't have any kind of starter or ignition interrupt.

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.

yes... that's what i think, too....

i did open the car with the valet key this morning.....

however this afternoon... i used the regular key....

i also CANNOT trigger the alarm now

If this happened by itself...... before the alarm sounding..... I would say it is a classic NSS issue.

for grins, i tried to jump the battery...but that's not it... the batter is fine.

__________________
1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


[/SIGPIC]

I am running. Don't know what was wrong. I pulled the aftermarket radio and reseated it and jiggled the distributor wires. Makes no sense

__________________
1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


[/SIGPIC]