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strange problem help

Discussion in 'A4/S4 forum(B5 Chassis)' started by jamie226bhp, Jun 25, 2010.

  1. jamie226bhp
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    jamie226bhp Member

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    [Jun 25, 2010]
    Just noticed that when in the car the interior light fades on and fades back down like a dimmer switch when set on the courtesy light position but not when you turn it off on the switch does anyone know why it would be doing this
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  3. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Jun 25, 2010]
    Because the switch is just a simple switch.

    If its on "courtesy" mode then its under the control of the central locking unit, so it can dim it up and down etc.

    If you switch it over to permanent on, it bypasses the locking unit and just jams 12v across the bulb, and similarly permanent off simply disconnects the bulb from the circuit, in both of those cases theres no fancy electronics in the loop, hence no dimming.
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  4. jamie226bhp
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    jamie226bhp Member

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    [Jun 26, 2010]
    So it's probably a faulty switch as it will keep dimming up and down all the time when it's in the courtesy position even when you've been driving for over 5 min
    Last edited: Jun 26, 2010
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