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Thread: Can the vectra start if the battery key is dead?

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    Regular Member danlat1415's Avatar
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    Default Can the vectra start if the battery key is dead?

    Can the vectra key start the engine if the battery in it is dead?

    I've lost my spare key but the battery in it is dead.
    I'm wondering whether to go through the hassle of informing insurers and replacing the locks.

    I think I remember using it previously and it setting the alarm off, but unlocking the door (when physically put in door key slot).
    I'm wondering if the electronics in the key, with the battery being dead - won't turn off the alarm or start the car due to not being able to turn off the imobiliser

    I never keep valuable in the car anyway, so just wondering for peace of mind that someone can't drive it away (they may be able to release hand brake and tow away, but not fully drive the car).

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    Regular Member Adam8220's Avatar
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    Im almost certain the car wont start if the imobiliser has been activated. There may be a signal for the transponder ring though for the guts of the key to deactivate this when in the ignition.
    If in doubt tech 2 the key out of the system and just have you r main key programmed in. The spare will still be physically able to unlock the car and fit the ignition but the transpondr will not be listed in the ecu as a recognised key.

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    Regular Member Chris SRi's Avatar
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    I think it will start the car. I reckon as well that if you put the key in the ignition and turn as if to start it then the alarm will stop.

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    Regular Member Ziggy's Avatar
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    Vehicle : Saab

    Trim : 9-3 Vert

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    If they can work out whos car it belongs to im sure they can change a battery. But yes the car will still start anyway

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    Vehicle : Vauxhall Astra-J

    Trim : Elite

    Engine : 2.0 CDTi

    Year : 2013

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    Quote Originally Posted by danlat1415 View Post
    Can the vectra key start the engine if the battery in it is dead?
    The battery inside the fob is only for the central locking.

    Quote Originally Posted by danlat1415 View Post
    I've lost my spare key but the battery in it is dead.
    If anyone finds it and manually unlocks the car with it, yes the alarm will sound, but as soon as they put the key in the ignition it will silence the alarm and they'll be able to start the car.
    The immobiliser chip in the fob is powered by an inductance loop fitted to the key lock or steering column.

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    Moderator & Events Assistant paulhb's Avatar
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    Vehicle : M5

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    But bear in mind if the spare has been away from the car for a long period mine was over a year then the immobiliser in the CIM won't recognise them mine had to be reprogrammed to the CIM a quick job but it needed Tech 2

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    Vehicle : Vauxhall Astra-J

    Trim : Elite

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    Year : 2013

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    Quote Originally Posted by paulhb View Post
    But bear in mind if the spare has been away from the car for a long period mine was over a year then the immobiliser in the CIM won't recognise them mine had to be reprogrammed to the CIM a quick job but it needed Tech 2
    I've had my Vec for 5 years now. Spare key has been in the drawer all this time. Tried it the other day - worked fine. Even unlocked the doors with the fob buttons - I thought at the very least it might have needed re-syncing to the central locking. Dash lights were set to a different illumination level and the climate control was at a different temperature to what I normally set it to, along with the CC being in eco mode. I only recently realised each separate key can remember certain separate settings.

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    Moderator & Events Assistant paulhb's Avatar
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    Vehicle : M5

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    Engine : 5.0 V10

    Year : 07

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    I have 2 spare keys since I updated to a flip one and they have been in the drawer for just over a year went to use them as a test a couple of weeks ago and no central locking and a big padlock on the dash display when I tried to start the car with them, got a mate to pop over with Tech 2 and 2 minutes later both were able to do everything again tried them just now to check and they are happy still

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    Regular Member rich r's Avatar
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    According to the Owner's handbook, you can deactivate the alarm by either pressing the 'unlock' button on the key, or putting the key in the driver's door lock, turning it towards the front of the car and then back to vertical. The transponder chip is only for the immobiliser on the ignition switch. You can set the alarm by putting the key in the door and turning it to the rear of the car, then back to vertical, then to the rear again, then vertical and remove. In other words - exactly the same as pressing the 'lock' button twice as normal to set the alarm and deadlock the doors.

    So if the battery is flat in the key, you can still set and unset the alarm and start the car.

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    when i bought the vectra the mechanic said to always rotate the use of the keys (2 of the said keys ) so i use a set and my wife uses the other set, the reason is because he said that lack of use and the car would not recognise the key and then would not start the car

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