Torque Cars

Rover 25 alarm system

Discussion in '200/25' started by Racer75, 27 March 2013.

  1. Racer75

    Racer75 Wrench Pro

    Messages:
    32
    From:
    Scotland, Glasgow
    Car:
    BMW 323i (e36)
    My Rover's alarm is driving me nuts. You can't leave the car for 5 minutes without it going off. I tried removing the fuse but then I couldn't open the doors and thus the engine wouldn't start. I was going to revert to the old ways and cut the wire that powers the sounder, problem is I can't find it. I think it may be under the passenger side window wiper blade but I really can't afford to get it wrong. :(

    Thanks

    Adam
     
  2. T9 man

    T9 man TC Pro Founder Moderator

    Messages:
    20,369
    From:
    London, UK
    Car:
    Saab 9-3SS T9
    Have you tried the schoolboy error stuff first in trying to find out what is setting it off?

    A lot of alarms with ultrasonic detectors inside the cabin, do not like open air vents as sometimes an inrush of air has been known to set these off, it is sometimes better to change these to volumetric ones.

    Also dangling air freshners or other silly decorations in the car can set the sensors off by moving if the car has been moved or rocked by a strong breeze or wind, so this will then be picked up as movement by the alarm.

    Also check the courtesy light in the cabin and the boot are actually switching off as failure to do so will set off the voltdrop trigger of the alarm. Also take a look at the bonnet switch for the alarm and make sure that it is operating properly and that the connections are not corroded.

    And finally, is the alarm self powered ie. does it have a built in battery which still allows the alarm to sound should the main battery lead be cut? If the main battery has a problem cell then this too can fool the alarm into thinking that there is a voltdrop trigger and sound the alarm. Check the main alarm unit itself and see if it has a small adjustable screw under a rubber bung, this is sometimes the vibration trigger depending on the model and sometimes can be set too sensitive. If it is there then adjust the screw slowly in stages both clockwise and anticlockwise, turn on the alarm and rock the car or kick the tyres until it goes off and then readjust accordingly to reduce it's sensitivity.

    I hope this helps, good luck buddy :)
     
    Racer75 likes this.
  3. HugoBoss

    HugoBoss The Torque Meister

    Messages:
    1,488
    From:
    Australia NSW
    Car:
    r33 skyline gtst
    If you took the car to the dealer would they be able to pick up on the lap top what is setting the alarm aff or is it a system completely on it's own T9?
     
  4. Racer75

    Racer75 Wrench Pro

    Messages:
    32
    From:
    Scotland, Glasgow
    Car:
    BMW 323i (e36)
    There is nothing in the car such as airfresheners or anything like that. The car isn't used an awful lot so it may be a voltdrop problem but I need to sort it as my door is being continuously being rattled by angry neighbours. Apart from the obvious what repercussions are there to just cutting the sounder out of the car?
     
  5. davalav

    davalav Moderator

    Messages:
    3,617
    From:
    Essex, England
    Car:
    Mini Cooper S R56
    Check the battery fob mate... mine was dying and set the alarm off every time I locked it. I had to unlock, lock, unlock then lock. The alarm system does have its own separate power supply though... Also try checking all the doors for the locking lever, and make sure its not stuck closed. Apparently the boot gets stuck and its very common.

    Hugo-

    Rover doesn't exist any more! LOL

    Taking to any garage should help diagnose the fault.
     
    Last edited: 27 March 2013
    Racer75 likes this.
  6. Racer75

    Racer75 Wrench Pro

    Messages:
    32
    From:
    Scotland, Glasgow
    Car:
    BMW 323i (e36)
    Thanks davalav, i'll try that :D

    Its got a 3 month old battery so i'll probably need to cut it out anyway, but i'll try to avoid it
     
  7. T9 man

    T9 man TC Pro Founder Moderator

    Messages:
    20,369
    From:
    London, UK
    Car:
    Saab 9-3SS T9
    OP did not make that clear HB but the pointers I gave are rules of thumb type faultfinding as I used to fit car alarms, electric windows, central locking etc back in the day to supplement my students grant.
     
  8. HugoBoss

    HugoBoss The Torque Meister

    Messages:
    1,488
    From:
    Australia NSW
    Car:
    r33 skyline gtst
    :amuse:LOL good to know...
     
Loading...

Share This Page

Click Here
  1. This site, like pretty much every other site, uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are agreeing to our use of cookies, this may include third party cookies from our carefully selected advertising partners and for our analytics which allow us to see which pages are of interest and improve our site navigation and experience.
    You can disable cookies in your browser but this may affect your experience on this website.

    Dismiss Notice