car alarm

onetomany

hi i drive a 51 plate vouxal zaffira sence the winter come some times when i start the engine the alarm goes of i can only turn it it of by opening/closing the central locking im totally skint so cart afford to take to a garage but a friend has suggested disconacting the alarm but some one else said its not that easy as will stop the engine working any tips or ideas on what it might be thanks in advance

forgotmyname

Faulty lock sensors? Its not picking up the signal that the remote locking has activated. Are you
opening with the key or remote fob?

Strider590

Happens when starting?

Pretty simple then really......... Your car battery is weak and/or the backup battery in the alarm siren unit is knackered.

I had to cut my alarm siren open to replace the internal battery pack not long ago (same unit as yours).

My bet is that both your main battery and siren backup battery are on their last legs, the alarm is going off because it's sensing a huge drop in battery voltage when you start the car, thus making it think the car is being tampered with.

If you remove the siren, you MUST have the keys in the ignition and the ignition on else it'll alarm and (I suspect it might) lock down the immobiliser, rendering your car less useful than a 1 tonne house brick.

vax2002

Is this the horn sounding or a siren type alarm ?
the answer is very important

onetomany

i use key fob and its sounds like car alarm i no this is a silly question but how do i charge battery? might start opening using key see if that helps

onetomany

ty i took car to halfords to check battery they said its a good one, so poped into my local garage to speak to a guy there told him i was thinking of getting rid of car and getting a cheaper one to run smaller etc he told me i must be mad and i wouldnt find one unless i was willing to spent 5000 so still gonna think about it do you no how i will beable to find out how much the car is worth? also he has a 53 plate zaffia on the forecourt and he said it does the same thing its a commen problem with age etc, so what do you guys think? i carnt afford to spend any on it if i dont have to but i did say to hubby maybe we should try to save some dosh and then traid it in etc thanks for all your great advice i dont have anyone else to ask

vikingaero

Zafiras fitted with the factory fitted alarm eventually suffer from a fault where the battery back up rechargeable battery built into the siren fails with age. The easy and expensive remedy is to fit a new siren/battery which is around £150 for the part from Vauxhall. Fitting will be extra. There may not be any advantage in buying secondhand if the cells of the secondhand battery are also aged.