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Help - All of a sudden making loud chirping noise when off

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Help - All of a sudden making loud chirping noise when off

 
Old 07-10-2019, 05:08 PM
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C230 Coupe
Help - All of a sudden making loud chirping noise when off

I've had my car stored at my father in law's for the past 6 weeks while they retrofit my building (and parking space). He started and moved it about a week ago and today went out to find it making this noise out of the blue with the car off.

The key fob won't open the door so I told him to get in with the emergency metal key on it and he did and then the fob won't start the car. He started it last week to move it just fine. He popped the hood and said it sounds like it's coming from somewhere down below.

Any idea what this could be? Sounds kind of like a constant cricket on the video attached (and when I was on the phone with him). So weird!
Attached Files
File Type: mov
IMG_6991.MOV (1.39 MB, 6 views)

Last edited by wes27hoya; 07-10-2019 at 05:14 PM.
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Old 07-10-2019, 05:11 PM
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I uploaded it to Youtube also if that's easier:

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Old 07-12-2019, 08:58 PM
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2011 C300 Sport 4matic, 2005 C240 4matic, 2003 C230K Sport, 1999 C230K Sport
Replace the battery in the key fob.

The manual key may allow entry but not disarm the security system.

i ran into a similar issue with a car that I considered purchasing. It had sat for a long time. Both the main battery and the key fob battery were dead, A jump got the car running but the alarm continued to sound until the fob battery was replaced.

(Btw, I didn’t buy the car. It was badly neglected and the seller didn’t provide much confidence.)
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