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How to stop my Ford Mondeo MK2 Alarm going off?

My 1998 mk2 Ford Mondeo alarm keeps going off after I set it for no apparent reason. It has only started doing this recently. Can anyone tell me why it keeps doing this?

Ian McLachlan, November 2005

home Fix label Security Systems label_important Car Alarm Systems category Forddone

In the boot on the passenger side, if you peel the felt away you should find the alarm horn which is separate to the main horn, I've disconnected mine for the mo, although the lights flash when the alarm goes off there's no noise for the neighbours. Then I used WD40 on the bonnet catch which worked for a few weeks and now had to resort to bridging the bonnet catch wires, so the car thinks the bonnet is constantly closed along with the rest of the car. Hope this helps.

Marcus, March 2014

The switch that most people are unplugging is the cause of the issue. Replacing it fixes the problem (you can verify this by pressing on the bonnet when its closed - the switch corrodes and when the car is cooling down it then doesn't contact correctly all the time).

Brian, December 2013

Unplugging the the two brown wires beside the windshield washer filler works no more waking up the neighbours.
Thanks Nathan.

john 2013, April 2013

well I have a 2001 mondeo and its alarm and hazards has started to go off for no reason so instead of double locking the car I just press lock once and it has stopped so I will get it looked at soon maybe try a new battery in the key

RJ, November 2012

I had the problem and what worked for me was ensuring the handles of the front doors are fully down. Spray under the handles to ensure they go fully down after closing the door.

Andy, March 2011

Heres a couple of tips for you if your car alarm keeps going off for no apparent reason.
1) put some good quality ear plugs in and you won't hear the neighbours banging on your door.

2) sell the car

the motor doctor, October 2010

mk2 mondeo.open bonnet next to your windscreen fluid theres a plug with 2 thin dark wires coming out unplug it . your doors will still lock indicaters will not flash when you double lock but should stop the alarm going off till you can get it fixed. X reg mondeo 2000 should work on older models good luck.

nathan, August 2010

found on the net. bridge a wire under the bonnet catch not sure if this work but must be worth a try hope this info helps if not let us all know

nathan, August 2010

how to disconnet alarm from main battery

jason, April 2010

I have same problem with 1998 si mondeo, keeps going of, have to leave car unlocked all the time, any ideas. Any one know how I disable it completely.

Thanks for help

Neil, March 2010

After all the rain we've been having recently my 1999 Mondeo Mk2 4-door saloon has been filling up with rain water on each corner of the boot lid gutter nearest to the rear window and the rain water wells up here. This in turn has got into the boot on the nearside causing my alarm to go off intermittently whenever it rains. As yet no cure but I have had to disconnect the wire attached to the alarm as a temporary measure so it doesn't disturb the neighbours at night. My drive has a bit of a slope which causes the water to collect when parked with the rear end up the slope.

mickey, November 2009

Check the bonnet switch...spray with WD40

Gary, June 2009

smash the siren

darren cousins, June 2009

Try this - found it while searching net as have same prob. http://www.mirez.co.uk/AlarmProbs.htm

okey dokey, January 2009

ive a mondeo mk 2 1999, i had the same problem when i locked the door maybe a hour goes by the alarm goes off and thats when its on my drive. i only have one remote key i put a new battery in and it doesnt work now and the alarm doesnt either. do you need to code them in or what. if anybody out there knows the code then please let me know. sorry i cant help i need help myself. steve

steve acko, November 2008

i have same problem and central locking locks itselfwhile i,m driving.help

mac, January 2008

same problem with a 2000 W reg mondeo TD. annoying.

richard, October 2006

It could be the alarm siren itself..thankfully this is quite cheap and easy......It contains an ECU ...Hope that helps you all....

lobofuego, December 2005

I've noticed since my Alarm has been playing up the my remote central locking has been also playing up. Sometimes when the alarm go's off the key won't unlock the doors but when I take the batteries out and put them back in it works again. Could the alarm be going off because the batteries in my key are going dead?

Anyone else get the same thing?

Ian, November 2005

Same problem with my Ford Mondeo 1997! Anyone with an answer?

Alex, November 2005

Not an answer but I am having similar problem with Ford Cougar 1999. Any help appreciated?

Mike, November 2005

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