Battery in OEM alarm siren

smatanovic · 11-24-2021, 08:22 AM

I recently bought an alarm retrofit kit on eBay. Since I don't know much about the donor car, I figured I would change the battery in the siren prophylactically, before installing everything.

I cannot, however, figure out how to get to the battery in the siren. There is no visible battery door, nor is there any discernible way to open up the siren.

Does anyone have instructions on opening this thing up to change the battery? Also, what battery do I need?

Thanks in advance.

SM

ctuna · 11-24-2021, 12:02 PM

No where have I ever seen that a battery seperate from the Car battery is
required for the OEM Car alarm.

https://www.e90post.com/forums/attac...5&d=1211989418

https://www.e90post.com/forums/showthread.php?t=145461

smatanovic · 11-24-2021, 01:47 PM

One of the DIY threads here talks about a battery inside the siren. I guess it's mistaken?.

smatanovic · 11-24-2021, 04:26 PM

I went ahead with the installation and it all works perfectly. Here's to pre-wiring!

11-24-2021, 08:22 AM	#1
smatanovic First Lieutenant 199 Rep 331 Posts Drives: 2022 i4 eDrive 40 mSport Join Date: Oct 2020 Location: The 215 iTrader: (0) Garage List 2022 i4 eDrive40 [0.00]	Battery in OEM alarm siren I recently bought an alarm retrofit kit on eBay. Since I don't know much about the donor car, I figured I would change the battery in the siren prophylactically, before installing everything. I cannot, however, figure out how to get to the battery in the siren. There is no visible battery door, nor is there any discernible way to open up the siren. Does anyone have instructions on opening this thing up to change the battery? Also, what battery do I need? Thanks in advance. SM
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11-24-2021, 12:02 PM	#2
ctuna Lieutenant General 2036 Rep 13,349 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	No where have I ever seen that a battery seperate from the Car battery is required for the OEM Car alarm. https://www.e90post.com/forums/attac...5&d=1211989418 https://www.e90post.com/forums/showthread.php?t=145461
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11-24-2021, 01:47 PM	#3
smatanovic First Lieutenant 199 Rep 331 Posts Drives: 2022 i4 eDrive 40 mSport Join Date: Oct 2020 Location: The 215 iTrader: (0) Garage List 2022 i4 eDrive40 [0.00]	One of the DIY threads here talks about a battery inside the siren. I guess it's mistaken?.
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11-24-2021, 04:26 PM	#4
smatanovic First Lieutenant 199 Rep 331 Posts Drives: 2022 i4 eDrive 40 mSport Join Date: Oct 2020 Location: The 215 iTrader: (0) Garage List 2022 i4 eDrive40 [0.00]	I went ahead with the installation and it all works perfectly. Here's to pre-wiring!
	Appreciate 0 Quote