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Thread: 05 Vectra CDTi - Blown bulb warning light?

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    Default 05 Vectra CDTi - Blown bulb warning light?

    In the past few days, my 'blown bulb' warning light has decided to come on, however, after checking all the bulbs in the car, all are working ok?

    Any idea's?

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    Regular Member felixx's Avatar
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    Quote Originally Posted by gmc View Post
    In the past few days, my 'blown bulb' warning light has decided to come on, however, after checking all the bulbs in the car, all are working ok?

    Any idea's?
    Your electrical system works on a type of voltage level recognition.As the filaments in your bulbs decay,the system requires more voltage to keep the bulbs lit.This is called resistance and the system will show a bulb failure prior to the bulb actually blowing because of the raised voltage.
    This is especially common with the indicator bulbs as the amber lacquer on the bulb "flakes" off causing the system to generate more resistance as more current is needed to keep the bulbs brightness constant.
    Aren't canbus electrical systems just great!!!!.FELIXX.

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    Thanks Felixx!

    Well, I ain't planning to change every bulb, so I guess I'll just wait on the culprit giving up the ghost!!!

    Thanks again

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    Regular Member m8internet's Avatar
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    It's normally the 21W bulbs; brakes, tail lights, indicators, reverse

    Sourcing it is usually easy enough
    If your car has the Driver Info Centre, it will advise you which one of those has failed
    Then simply replace those, wait about 90 seconds to see if the warning clears

    However, I do agree, it is over sensitive
    I sent a passenger to the rear as they noticed the warning had come up, then came back, "I can't see any that aren't working"
    Later that night I swapped both brake lights

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    Vehicle : Vauxhall Astra-J

    Trim : Elite

    Engine : 2.0 CDTi

    Year : 2013

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    Quote Originally Posted by gmc View Post
    however, after checking all the bulbs in the car, all are working ok?
    Double check your brake lights. If the upper tail/brake light fails, then the lower tail light takes over the role of tail/brake light instead.

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    Quote Originally Posted by Big Dave View Post
    Double check your brake lights. If the upper tail/brake light fails, then the lower tail light takes over the role of tail/brake light instead.
    good tip thanks!

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