Urgent car alarm help

[Misc]

Have a MK3 Golf GTI with a big problem it seems.

Went out today & got back & the remote fob didn't work, so manually used the key in the door but the engine wouldn't start/crank so i'm guessing the immobilizer is still on. Obviously i can't turn this off with the fob so the car is stuck in some carpark.

What can i do?

Cheers

[Mrs Kickstart]

Hi.

Replace the battery in the FOB/ or use the spare. Other options get expensive

Regards
C
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[Misc]

Hey,

Tried replacing the batterys & i didn't get a spare.
It sucks because i'm not even sure of the exact model of the alarm.

[10 pence Short]

Do the ignition lights come on when you turn it on? If so it may be worth putting a feed to the starter motor trigger. Cheaper alarms just interrupt the signal to the starter motor.
You can bypass this by finding the starter motor, usually front right above the gearbox, find the smallest wire to it and supply it with a positive feed with the ignition on.
If it starts great, if not the immobilizer may interrupt the ignition or fuel circuits. Thats a bit harder to get around.
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I haven't had a cont all day, drinkstable.

[Misc]

[Phoenix]

If the battery went flat and you spent a while trying to get it to work you might have caused the fob to desynchronise with the alarm. Read the manual or google for the manual to find how to resynch the fob, it's usually something like holding both buttons (while close to the car) for 10 seconds or so.

Obviously if the alarm fob is actually broken and it doesnt flash at all when used then you need to remove the immobilisation circuit, could take a while if it's a proper under the dash job.

[UnknownStuntm...]

ok - obvious questions first - has it got a known alarm? If so, what make is it etc. There may be a battery backup in the alarm, making it seem to work ok (as in, it'll go off!) when the car battery is knackered.

Mk3s have immobilisers in the key housing, so if it's not an OEM key you'll have problems.

When my battery dropped a cell, it would act like everything was ok except the crank of the motor, I could hear everything doing the do beforehand, even the lights worked ok - so as above, I'd check that too.

[Misc]

Thanks guys, well i'm going to leave it for now as i'm going get road side to have a look & eventually tow it home (hopefully) from there i will give an car electrician a call & get them to have a look.

Thanks for the help.

[Misc]

So, got the car towed home whilst my mum went to her fav mechanic, he tells her to look at the starter motor & spray WD40 on one of the thin wires on the starter motor (he says this sots out a majority of alarm problems. We done this & key fob worked like a charm. Something so simple.

You'd of thought the recovery guy would of known this..

[10 pence Short]

The starter motor shouldn't affect the alarm system. It may have just been the starter motor poor connection.

Another idea is that there was radio interference at the car park causing the alarm to be confused whilst waiting for the alarm fob signal. Moving the car away from the interference may cause the fob/alarm to work again?
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I haven't had a cont all day, drinkstable.

[Phoenix]

Indeed, can't see how a poor connection at the starter has anything to do with the alarm, no alarm wiring would go directly to the starter motor anyway. Sounds like it could well have been radio interference.