Alarm going off continuously when parked

UK forum for general and technical discussion about the Z3 roadster

Moderator: Gazza

Post Reply
Robin82
Joined: Fri 28 May, 2010 03:04
Posts: 80

  Z3 roadster 1.9

Alarm going off continuously when parked

Post by Robin82 » Wed 31 May, 2017 16:54

Off the back of replacing the head gasket and a couple of engine sensors, I have another issue! About a day after the fix I woke up to my hazard lights flashing in a pattern - 1 -3 -1 -3 which I thought was odd as no alarm was sounding. I haven't used the alarm for over a year due to never locking my car (I live in a very remote village) and when I'm out I've just locked it manually. I replaced the remote batteries (as they were flat) but the alarm isn't responding at all. After locating the horn below the fuse box I twisted the key - a dumb move as it almost blew my eardrums out. Alarm going off confirmed.

I've disconnected the boot sensor and no change - although perhaps disconnecting would sound the alarm anyway?

I'm not sure if the year of my Zed has a tilt sensor, apparently not all Zed's do? I have a - 97 1.9L

What else could it be? I'm currently removing the hazard relay when parked up to prevent the battery from draining. Would a low battery cause this?
Image

Robin82
Joined: Fri 28 May, 2010 03:04
Posts: 80

  Z3 roadster 1.9

Re: Alarm going off continuously when parked

Post by Robin82 » Tue 06 Jun, 2017 17:23

After digging deeper I found this very informative thread:

viewtopic.php?t=4959

It seems as though this was my issue - battery going completely dead (which I guess would count as it being disconnected) and then the alarm activating and codes being reset so I cant turn the bugger off!

Seems like a _fairly_ straight forward fix.
Image

User avatar
colb
Joined: Sat 05 May, 2012 23:46
Posts: 567

  Z3 roadster 1.8 TU
Location: Newport South Wales UK

Re: Alarm going off continuously when parked

Post by colb » Thu 08 Jun, 2017 01:55

Usual culprit is waterlogged tilt sensor in left hand side of boot floor that's where yours will be on a 1.9
Colb
1999 BMW 1.8 Z3
1998 Honda Deauville NT650V

Robin82
Joined: Fri 28 May, 2010 03:04
Posts: 80

  Z3 roadster 1.9

Re: Alarm going off continuously when parked

Post by Robin82 » Thu 08 Jun, 2017 10:03

colb wrote:Usual culprit is waterlogged tilt sensor in left hand side of boot floor that's where yours will be on a 1.9
I read that as my Zed is one of the early models (1997) that it doesnt have a tilt sensor in the boot ?
Image

User avatar
Buz007
Joined: Fri 16 Jul, 2010 21:18
Posts: 244

  Z3 roadster 1.9
Location: Leeds

Re: Alarm going off continuously when parked

Post by Buz007 » Thu 08 Jun, 2017 12:21

sometimes an earth fault can cause the alarm to continuously sound. I had my bonnet re-sprayed recently and removed all the washer pipes and insulation shield etc myself. once my beautiful new bonnet was back on I forgot to connect up the earth cable which is in the far right had corner as you look into the engine bay. Many noisy hours later I traced it to this, connected it back up and all was good again. Could have worked its way loose?
''need I remind you 007, you have a licence to kill...not to break the traffic laws''

User avatar
billysally208
Joined: Sat 11 Jul, 2015 13:53
Posts: 38

  Z3 roadster 1.9i

Re: Alarm going off continuously when parked

Post by billysally208 » Thu 08 Jun, 2017 23:25

Bonnet alarm switch is another favorite - just disconect the plug connecter to the switch and add a wire loop across the terminals to make it think the bonnet is closed.

User avatar
BladeRunner919
Joined: Fri 17 Feb, 2012 20:18
Posts: 2220

  Z3 roadster 1.9

Re: Alarm going off continuously when parked

Post by BladeRunner919 » Fri 09 Jun, 2017 08:28

billysally208 wrote:Bonnet alarm switch is another favorite - just disconect the plug connecter to the switch and add a wire loop across the terminals to make it think the bonnet is closed.
Disconnect it, but don't add a wire loop - that will make the alarm think the bonnet is open!

Post Reply

Who is online

Users browsing this forum: No registered users and 5 guests