my16 307headlghts come on an random when switched off and engine running
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  1. #1
    Tadpole
    Join Date
    Jan 2016
    Location
    Eltham
    Posts
    1

    Default my16 307headlghts come on an random when switched off and engine running

    Hi I know that this has been discussed before, but, I thought I'd start a gain since time has passed.
    My 2006 1.6HDI Wagon has, for some time now, switched its head lights on randomly as follows:-

    CASE A.
    A1. Head lights OFF at head light switch =TRUE
    AND
    A2. Engine running =TRUE
    RESULT headlights operate randomly.
    HIGHBEAM in flash mode only.

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    However, if the engine isn't running...
    CASE B.
    A1. Head lights OFF at head light switch =TRUE
    AND
    A2. Engine running =FALSE
    RESULT headlights DO NOT operate.
    HIGHBEAM in flash mode only.
    Otherwise the headlights work ok.
    I have been told it is necessary to replace the headlight switch assembly on the steering wheel column, however, repairers are not guaranteeing this will fix the problem.

    Of course, if I could pick up a DC signal from the head light switch when it is on, then it would be trivial to set up a circuit which operate only when the headlight switch was on.
    However, noone seems to know if this is possible.

    I'm keen to hear from anyone who has actually had this problem rectified.

    Karl
    Last edited by karlreed43; 1st December 2019 at 01:21 PM. Reason: typos

  2. #2
    1000+ Posts
    Join Date
    Mar 2004
    Location
    Brisbane
    Posts
    1,745

    Default

    You may strike issues as the canbus system measures the current going to bulbs, to put in a relay would confuse it somewhat, unless the input impedance of the relay etc matched a bulb allowing the ecu monitoring them to believe a bulb was present, it will have a low tolerance as any 407 owner like myself will attest, if its not a fog lamp fault, its a sidelamp issue.

    Not impossible.
    87 S1 205 GTI / GTI6 powered a project underway
    306 convertible (gti6 candidate)
    307 HDi wagon
    407 HDi wagon

  3. #3
    UNM
    UNM is offline
    Fellow Frogger!
    Join Date
    Dec 2014
    Location
    Melbourne, Australia
    Posts
    321

    Default

    Pretty sure you have a faulty comm2000 unit.

    I had a very similar issue with a 206 GTi - picked up a replacement unit from the wreckers and all resolved.

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