After sitting at the airport for 4 or 5 days with the alarm fuse pulled, I go the car home and plugged fuse 13 back in. The alarm LED works fine and behaved like it should, however the arm/disarm beep wasn’t working when the car was locked or unlocked. On the plus side the alarm wasn’t going off anymore after a minute or so. After driving it this way for a week or so, and another trip to the airport, my suspicions of a failed 20 year old siren battery were now even stronger, so I ordered one from FCP.

Not kidding when I say the next time I drive the car that day, the alarm beep on lock/unlock worked fine, and has continued to do so. Amazing.

At any rate, she’s getting a new siren. Any gotchas to this job? I can’t imagine there is any software issues are there? My plan is to pull fuse 13 and with the car unlocked swap the new siren in.

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Current
Original owner 2002 E53 X5 4.4i to 4.6i swap
2026 G80 M3 6 spd
2025 G06 X5 50e
Former
1972 Audi Fox
1986 Saab 900S
1996 BMW Z3
1998 BMW E36 M3 Sedan
2004 BMW E46 M3
2006 Audi A3 Quatro
1993 Mopar 318 Jeep Grand Cherokee
2015 V6 Jeep Grand Cherokee