S40 (New) Electrics : - s40 2008. alarm fault.

mark8 · Oct 31st, 2019, 20:11

hi. problem with alarm. went to unlock car with key fob. fob not unlocking . changed battery in fob. still not working. unable to unlock car so used key on drivers door. opened door alarm went off. alarm turned off by using ignition key and starting engine. issue is now that unable to lock or unlock car with key fob. The alarm led on top of dash board is no longer flashing. Alarm system not activating. Not sure what to do next . Do I look at the siren module for fault or is their a problem with some other item.

M4ss4 · Oct 31st, 2019, 20:25

Quote:

Originally Posted by mark8

hi. problem with alarm. went to unlock car with key fob. fob not unlocking . changed battery in fob. still not working. unable to unlock car so used key on drivers door. opened door alarm went off. alarm turned off by using ignition key and starting engine. issue is now that unable to lock or unlock car with key fob. The alarm led on top of dash board is no longer flashing. Alarm system not activating. Not sure what to do next . Do I look at the siren module for fault or is their a problem with some other item.

Was the car battery flat by any chance? I read that you did start the car so assume not. I remember my V50 doing something similar but it was my car battery.

Do you have any messages on the dash?

mark8 · Oct 31st, 2019, 21:14

only message on dash display was alarm activated after alarm first went off. Main battery on car was fine as car started with no problem.

M4ss4 · Oct 31st, 2019, 21:24

Quote:

Originally Posted by mark8

only message on dash display was alarm activated after alarm first went off. Main battery on car was fine as car started with no problem.

Okay cool. I would maybe get a battery check just to be on the safe side before going much further. iirc the sirens have an internal battery inside for the battery back up feature. I think that would show an "alarm service" message on the dash, but could be worth a shot.

Might also be worth just taking the car battery off for 10 mins or so, this forces a reset on most car systems so may clear something odd.

mark8 · Nov 1st, 2019, 11:30

Thanks for the reply. I will give it a go at the weekend.

Oct 31st, 2019, 20:11	#1
mark8 New Member Last Online: Nov 4th, 2019 21:30 Join Date: Apr 2016 Location: dunstable	s40 2008. alarm fault. hi. problem with alarm. went to unlock car with key fob. fob not unlocking . changed battery in fob. still not working. unable to unlock car so used key on drivers door. opened door alarm went off. alarm turned off by using ignition key and starting engine. issue is now that unable to lock or unlock car with key fob. The alarm led on top of dash board is no longer flashing. Alarm system not activating. Not sure what to do next . Do I look at the siren module for fault or is their a problem with some other item.

Oct 31st, 2019, 21:14	#3
mark8 New Member Last Online: Nov 4th, 2019 21:30 Join Date: Apr 2016 Location: dunstable	s40 alarm only message on dash display was alarm activated after alarm first went off. Main battery on car was fine as car started with no problem.

Nov 1st, 2019, 11:30	#5
mark8 New Member Last Online: Nov 4th, 2019 21:30 Join Date: Apr 2016 Location: dunstable	Thanks for the reply. I will give it a go at the weekend.

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