Ford Owners Club - Ford Forums Messages

Club Announcements

Ford Fair 2016: Tickets and stand passes are now available to purchase. More info here.

Review your Ford: Help others when it comes to buying a car like yours and review your Ford now

Ford Car Parts: View All ford car parts by category. Look for Ford Car Parts now!

AdBlock Warning

Parts of this website do not function properly with AdBlock enabled on your device. To get the best user experience on our website, please disable Adblock for this website (domain) on your browser.


mikester

What Sensors Could Be Setting My Alarm Offf?

13 posts in this topic

the last two nights my car alarm has gone off three times, one time I got in the car to check any messages and just saw "alarm triggered, check vehicle" which doesn't indicate what caused the false alarm.

The next time it happened I did the same, this time I got the message "bonnet open", there's no way my bonnet was open. Checked it, sure enough it was closed tight. I opened it anyway and dropped it shut just to be safe. No more alarms that night. But there was the following night, there's no wind or it wasn't even that cold, what sensor could be setting the alarm off?

Even better, is there a way to check what part of the car triggered the alarm? In the meantime how do I lock the car with the alarm disarmed?

Share this post


Link to post
Share on other sites
 

Sounds like a dodgy bonnet switch to me - have you checked the bonnet switch and wiring?

Share this post


Link to post
Share on other sites

Back to my car for lunch... wouldn't you know it, alarm gone off again!

I don't know where the sensor is under the bonnet, if I find it and unplug it will there be any other adverse effects (other than the security or lack of)?

I need a solution to turn the alarm off completely for now as I need a good nights sleep and am concerned about being away from the car for extended periods, anyone?

Share this post


Link to post
Share on other sites

has your car ever had repairwork to the front?

Share this post


Link to post
Share on other sites

Never.

I haven't got my handbook on me, hopefully it'll say in there if I can lock the doors without the alarm. I'm out of warranty now so no chance am I going to the dealer. I'll just disconnect the alarm if I can't find the cause. Not sure how to isolate it without a notification system in the car ie what sensor is fubar!

Share this post


Link to post
Share on other sites

Bonnet switch wiring probably looking for closed contact when bonnet shut. If you unplug it this may still make the alarm sound as it will be open circuit (thinking the bonnet already open ?).

If you find connector to switch and disconnect it you will probably have to short out the connection with a piece of cable to simulate switch being in place and bonnet closed. This could be a good test to see if you do in fact have a faulty switch - I would suspect that before a wiring fault.

Switch may just be sticking with colder weather and be fixed with a good squirt of WD40.

Share this post


Link to post
Share on other sites

The bonnet switch is part of the latch mechanism mike. If you need a price just let me know

Share this post


Link to post
Share on other sites

Kk thanks adam. Will have a look at it tomoz see if some lube will fix it. I've locked the car with the key in door and used a disclok in the meantime, not sure if that doesn't activate alarm

Share this post


Link to post
Share on other sites

Hi, did you resolve this?

I have just bought a Fiesta Zetec S and am finding the alarm is going off too! It went of twice last night!!

I am taking mine in next Wednesday as still under warranty but is there a quick method you found out? I need sleep!!

Share this post


Link to post
Share on other sites

anyone have any joy solving this, my alarm is now going off each time i look the car, various messages bonnet open, door open, boot open etc!!! grrrr!!

Share this post


Link to post
Share on other sites

if you have a radio code try disconecting the battery for half hour or so to reset the alarm module otherwise if you knew where the module was under the dash you could just disconect if in place of the battery. the bonnet catch is indeed inside the latch and sometimes the grease inside it when its cold or old gets sticky and makes it read wrong.. but the member with varous faults needs the module disconnected and reset or replaced if its went faulty and wd40 for the bonnet faults should wash and free it up. as for locking without arming the alarm if you pres the remote once so the doors lock and DO NOT press a second time as the alarm arms with the double locking, well it used to on the fiestas before the current model,lol..

Share this post


Link to post
Share on other sites

Anyone try and figure this out?my dealer gets the part but is the wrong fitment.all he does is wd40 or resets it.last for 4-6 months then prob will have to do again.happened twice now.this is frustrating for me as I'm a driving instructor.cant risk this message coming up while test is happening.back to my 08 plate fiesta style,no sensors no headache.going to pickup my faulty car today.not looking forward to teaching in it again.

Share this post


Link to post
Share on other sites

You have PM.

It's a piece of pee fix, don't mess about disconnecting anything. Just buy a new latch, haven't had the warnings and false alarms since I replaced the latch at the start of last year.

Around £30 for the latch with perimeter sensor from fordpartsuk.com (sorry Adam, I know I should have come to you first!)

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now