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Thread: Rear Bulb circuit

  1. #1
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    Default Rear Bulb circuit

    Hi,

    The Mrs has just brought the car to my work and said that the light has come on to say that a bulb has gone so looking round the car found out it was the passenger rear fog light so i took the bulb out and notice that it didnt look blown so i swapped it with the other side and it works fine but on the passenger side it didnt again.

    Has anyone had this problem before and know how to fix it?

    Cheers Alan.

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    Regular Member LJ sxi-nav's Avatar
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    Default

    Firstly, the passenger side fog-light is not wired (look at the bulb holder and you'll see no connections to that bulb), bulb is supposedly fitted as a spare...

    secondly, the bulb failure message sometimes comes up just before a bulb is about to blow. The check circuit measures resistance, which changes as the bulbs get older - sometimes enough to trigger the warning. Try cleaning all the bulbs and contacts, however I suspect a bulb will most likely go soon. Also note that number plate bulbs are not part of the check circuit.

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    Regular Member Ademusic's Avatar
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    nor are the interior lights part of the check system. As bulbs get older and the filaments get thinner, the resistance does indeed increase and can throw a warning. If it's on constantly then it's more than likely a bulb is about to blow, if it's on intermittently then it's more than likely one of the contacts are a bit grubby in one of the bulb holders.

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    Ok thanks for that guys it did come on last time as a warning and a few days later a bulb went so ill keep my eye out for one going again as i guess its that just seen the passenger side one not working so thought it was that but been corrected so thanks again for that )

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    Regular Member taffy bhoy's Avatar
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    when one of mine went, it gave power to another bulb in the rear cluster so you still had 2 red lights on either side. safety thing i suppose lol. easy to miss at a quick glance and you think both sides are work fine

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    yeah when my side light went it kept the indicator on all the time to replace it. i think itll be the side light again as i only replaced the side that was blown before

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    One of the tail lights is also the brake light. Should the upper tail light (which is also the brake light) fail, then the lower tail light takes over the role of tail & brake light.

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