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Thread: HELP headlights are on when light switch is off

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    New Member chippyd's Avatar
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    Default HELP headlights are on when light switch is off

    Driving home from work i notice my headlight dipped beam came on by themselves with the light switch in the off position also then noticing the rev counter dropping down to zero revs then shooting back up to where it should be three times without the engine losing any speed, got home switched the engine off remove the key thinking the lights would turn off but no they stayed on ,turning the switch on and off makes no difference in the end i had to disconnect the battery leaving it disconnected for 50min then reconnecting hoping it would reset itself, now the weird thing is the dipped beam comes on
    as soon as you turn the ignition to position 1 (light switch is off) ,my wipers/horn/front indicators/front fogs no longer working ,indicators only working at the back but are flashing to quick as if a bulb has blown ,i've checked all fuses in engine bay passengers side and boot all ok i really need your help the stealers i can't afford its a 06 sri 150 estate.Thanks

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    New Member chippyd's Avatar
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    cheers i'll try that in the morning.

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    Quote Originally Posted by chippyd View Post
    cheers i'll try that in the morning.
    hope it works keep us posted

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    Regular Member Das's Avatar
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    Yea try fuse 17 or remove the multi plug from the ABS unit, give it a quick squirt of WD40 and refit.

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    New Member chippyd's Avatar
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    after reading some reviews earlier i removed the multi plug from the ABS unit didn't have any wd to hand so i just riggled the connection a bit

    but it didn't make any difference , will try some wd tomorrow .THANKS

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    Regular Member TonyP2020's Avatar
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    It could also be a faulty alternator. If the alternator regulator is faulty the voltage output could be to high, as high as 21Vdc.
    The lights will then come on to use up some of the extra voltage. You need to check the voltage across the battery whilst the engine is rev'ed up.

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    Not sure about the lights trying to use up the extra voltage, but a faulty alternator can cause all sorts of electrical gremlins.

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    New Member chippyd's Avatar
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    Afternoon all thanks for all your replies so far just a update on what i've tried,
    wd 40 in abs plug, remove fuse 17 no joy
    checked alternator voltage which is 14.2v when revved seems ok
    any more suggestions are welcomed.cheers

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    New Member chippyd's Avatar
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    Thought Iíl lgive some progress feedback , I became desperate and made a call to the stealers on Friday to book thecar in for a diagnostic for Monday ,told him all the problems I was having he then said because itís an electrical issue it would cost £120 instead of the usual £60 something straight away I became nervous thinking what would the repair bill be, anyway yesterday on the off chance I was passing a garage and pop in to see if they could do a diagnostic check luckily they did and diagnosed it as a problem with the cim unit so he done a reset and all seems to be back to normal so far finger & toes cross.hope this maybe off help to anybody else.
    Last edited by chippyd; 20th May 2012 at 22:12.

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