2006 M35 Beeping at Startup

[rsolo]

My M35 started emitting a pulsating on/off beeping sound a few seconds (6-10) after ignition in the ON position or when starting the engine, beeping lasts for about 10sec.

There are no alarms displayed on the dashboard

It is not a TPMS related issue as I have double checked all the tires (Been IS NOT long and constant)

Car drives normal and no beeps are heard after that.

The battery occasionally drains out without a cause if not driven for a couple of days, but I am not sure if this is a separate issue.

I appreciate the suggestions.

Thanks

[lovemycarM35]

you might want to have your battery tested

[The00Dustin]

The beeping sounds to me like a key fob detection issue. Specifically, it may be the same beep I hear when I get out of my car with it running while the key fob is in my pocket (6-10 seconds sounds extra long, though). Try getting out of the car and locking it with the door button while it is running and you are not parked in your normal location. If you hear the same beep, then you know it has to do with the key fob. If you hear the same beep, maybe your spare key fob is stored too close to the car? This is a bit of a long shot, because I think my car only does it randomly when I get out while it is running, not every time. It could be a warning that it thinks I am about to drive off without the fob, so it may only be happening when it thinks I got in the vehicle or the vehicle is not in park or something. The beep is on the outside, though, not like the normal interior beeps (though I'm sure you can hear it inside as well), and that makes me think it is more likely supposed to warn me that the ignition is not in the off position (which means the vehicle could be started again without the fob [easily stolen, I guess]).

[The00Dustin]

Got out of my car with it running today and it was three longer beeps. The quick pulsating beep happens sometimes, but not consistently, and I'm not sure what it means. Maybe it's when you try to lock the doors and it thinks the key is still in the cabin so the doors don't lock or something.