Rover 45 alarm keeps going off (SOLVED)

[Imonster]

How on earth can I disable the alarm on a Rover 45 (X plate) please? Intermittent fault that's been getting worse and I don't want to annoy the neighbours or me for any longer than necessary.

The car's in excellent condition for it's age, it unlocks and immobilises fine, drives fine, locks fine. Then approximately a minute later the alarm will go off three times in a row. This is tedious, but it's now doing it at seemingly random times.

Not worried about disabling it for good as I don't think the car sits especially high on professional thieves or joyriders wish lists, but I'm wondering if there's an easy way of doing it without immobilising the car permanently by mistake.

Failing this, is there something else obvious that could be causing the fault? I know bugger all about cars, so would appreciate any assistance.

Please feel free to pm if you don't want to stick up information on how to disable car alarms in the public domain.

Many thanks for any help
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[Casper]

If its not wired to the horn then cut the nee naw speaker. If it is still diconect the horn and re wire it from another feed.

[Chalky.]

It's most likely connected to the horn, remove the fuse.

[Casper]

[Chalky.]

A draught past the ultrasonic sensor in the driver's door jamb is a possibility - try sticking selotape over the whole sensor & if it fixes it you need to check your windows & doors are sealing properly & maybe even shut off the vents.

Another common cause is the battery voltage dropping. The lamp in the boot can stay on & that may set the alarm off so try taking the interior bulbs out & switch the courtesy light above the rear view mirror off and see if it is fixed. It might also be worth checking your battery is holding a reasonable charge, depending how old it is.

The only other possiblility is a fault at one of the switches so maybe inspect the bonnet, boot & door switches thoroughly & get someone to sit in the driver's seat with the ignition on to confirm the warning lights go out.

[Ja7]

I think there's a way of turning it off by the key in the door and turn 7 times, can't really remember the right way, the sequence was in the owners manual, do you have a owners manual ? Might be worth a look if you do.

[Casper]

[Imonster]

[thomp1983]

simple and cheap would be to fit a switch inline to one of the horn wires and mount it somewhere convenient, but finding the fault would be the bet thing to do, try asking over on mg-rover.org there a fairly useful bunch regarding mg's

chris

[_Iain_]

I'd cut the existing horn wires out completely at the push button and at the horn, then run a completely seperate circuit pinching a +12v feed from the fag lighter or CD player. Pissing about with immobiliser/alarm wiring sounds too much like ballache to me - especially on a rover as you know it'll be hours with a multi meter to find.
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[Nb]

According to autodata the 45 uses a separate alarm siren behind the nearside front bumper, unplug it.
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[Casper]

[G]

Bit late - but if it was the horn, you could fit a relay so the horn wiring only came live with the ignition on.

[Imonster]

[stevo as b4]

All Rover 400 alarm problems that I've had, (basically the same car) have usually been caused by a corroded or broken door contact switch. The same ones that operate the interior lights. I've replaced these in the past and it's solved the random middle of the night alarm going off episodes.

As said I wouldn't be too bothered if the alarm system was non operational on a Rover 400/45, of slightly more importance is the immobiliser system, but it's not a car that would get broken into usually unless an item of value was left on display inside.

[Turkish]