[Mr.G20 M340]

So for some odd reason my cars alarm has been setting off by itself very randomly. The car has done this before once. I checked underneath the car and walked all around it and nothing out of the ordinary.
I think it’s my car battery Is the battery going bad maybe? I’m hoping there’s no mouse in there.
I only have 30.5k miles on it only and it’s a 2020 MY. It is tuned if that makes a difference.
This does not help my anxiety because I recently had a couple thieves try to break into my car in the parking spot my buildings garage so whenever I hear it I run downstairs thinking the thieves are trying to break in again, but nothing.

[MichaelNRW]

Do you have anything plugged into the OBD port?
The car can identify some devices as manipulating and the alarm goes off.

[G22b58]

The car saves the reason for theft alarms in "alarm memory". I don't expect you to have a "Display key" in addition to the smaller key but if you do, open the car with that key can show what triggered (this key comes with the parking heater).

Some diagnose (OBD2) tools should be able to read the alarm memory (but I know that BimmerLink can't).

[Mr.G20 M340]

Originally Posted by MichaelNRW

Do you have anything plugged into the OBD port?
The car can identify some devices as manipulating and the alarm goes off.

I have a dash can that’s turned off when I’m in my garage. But it’s not plugged into my OBD

[Mr.G20 M340]

Originally Posted by G22b58

The car saves the reason for theft alarms in "alarm memory". I don't expect you to have a "Display key" in addition to the smaller key but if you do, open the car with that key can show what triggered (this key comes with the parking heater).

Some diagnose (OBD2) tools should be able to read the alarm memory (but I know that BimmerLink can't).

I just downloaded the “my bmw” app on my phone, but don’t see any info on alarm memory.

[G22b58]

No. I had also expected to be able to get some info on the alarm from the BMW app (or why not the display in the car?), but the only "BMW prepared" way for a normal user seems to be via the "Display Key". But even that doesn't access the stored memory and only shows the cause if used to unlock the car after a triggered alarm.

[MichaelNRW]

Originally Posted by Mr.G20 M340

I have a dash can that’s turned off when I’m in my garage. But it’s not plugged into my OBD

There are multiple conditions for the alarm to go off.

Where is your dash cam attached to the car for power supply?

Triggering the DWA alarm (alarm trigger signal)

A DWA alarm is triggered if an alarm status is detected while the anti-theft system is activated. The following triggers a DWA alarm:

Forced opening of a door: Bus signal, door contact
Forced opening of the tailgate: Bus signal, tailgate contact switch
Forced opening of the engine compartment lid: Bus signal, engine compartment lid contact switch
Movement within the passenger compartment: Signal from ultrasonic interior sensor
Vehicle on an incline: signal from the tilt alarm sensor
Line disconnection of the sub-bus
Undervoltage, overvoltage, monitoring the vehicle battery (positive wire and negative lead)

The FZD control unit activates the loudspeakers of the emergency power siren upon activating a DWA alarm. The FZD control unit simultaneously sends an alarm signal to the K-CAN2. The Body Domain Controller (BDC) activates the optical alarm via the lighting system. The emergency power siren can also trigger an acoustic alarm if it is separated from the vehicle electrical system through manipulation while the DWA is activated (independent voltage supply via batteries).

A DWA alarm is immediately cancelled under the following conditions:

Disarming the antitheft alarm system
Switching on the PAD mode

Undervoltage detection, overvoltage detection, monitoring the battery

If the alarm system is activated, the FZD control unit monitors the vehicle voltage in a range between 6.5 and 17 V. The FZD control unit detects the following deviations:

Undervoltage: Vehicle voltage less than 6.5 Volts
Overvoltage: Vehicle voltage greater than 17 volts
Drop in the on-board supply voltage from 7.5 Volts to 6.5 Volts within 40 minutes
Disconnecting the battery positive wire or the battery negative lead

The voltage thresholds for overvoltage and undervoltage must be detected for at least 250 milliseconds.