Autolevel61

My 2009 e350 sedan alarm keeps setting off by itself. Today was the first time I drove the vehicle in 5 days. Parked the car and 4 separate times the alarm is going off.

What could be wrong here? Help needed. Security in my office building keeps Calling me!!

Autolevel61

Note- I took the battery's out of my key as I am close to my car from the window. Alarm has not gone off since.. what gives? Bad key?

konigstiger

Check siren for internal corrosion here are compatible part #s for replacement.

Autolevel61

I'm also getting "hood open" warning when driving. Alarms even going off with car unlocked.

Courtesy lights also won't turn on doors or overhead. Could this be more than a siren

konigstiger

Then you also need to check the hood switch, (130 in diagram) part # 2038219251.

Autolevel61

Still going off. Could the hood switch be broken? Prompting the alarm to go off?

tjts1

The alarm has an internal battery that fails with age and leaks on to the circuit board. Remove or replace the alarm. It's useless so I just removed it. It's located behind the front left fender liner.
https://mbworld.org/forums/sl-class-...y-fix-diy.html

Autolevel61

Alarm stopped overnight. Now my hood latch open warning is on. This can't be all related to the alarm can it?

tjts1

It can be related. The alarm module had a lot more functionality built in beyond just making noise.