1997 E36 Z3 2.8 - dash lights & buzzer dont work

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  1. 1997 E36 Z3 2.8 - dash lights & buzzer dont work 
    #1
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    The Boz's Car Details
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    Hi,
    Just bought a 97 z3 and found the dash lights and heater controls dont come on with the headlights. also, the buzzer warning if you open the door with the headlights on doesnt work either.
    I've checked the fuses (23, 27, 31 & 46) and they're fine. I've read on here that this could be the dash dimmer rheostat in the headlight switch needs replacing. but before i buy a replacement, i'm curious about the buzzer not working either? does this suggest the problem is something else?

    Thanks,
    Leon
     
     

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    The buzzer could be using the same feed as the dash lights to detect if the lights are on.Ive not got an E36 electrical diagram to hand to check this is the case.
     
     

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    Dr of BMW gildersol's Avatar
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    Fuse for dash lights is F37 (10A)
     
     

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    ok i've just had a look in the fuse box and number 37 is the license plate light. the numbers 23, 27, 31 & 46 are listed under 'instrument cluster'.
    fuse 25 is common to all 'headlight' listings, and each 'headlight' listing (high-beam, low-beam, left, right) has its own individual fuse as well. can anyone tell me what fuse 25 is for?
    if anyone has a wiring schematic for the e36 (actually e36/7 - its a z3, dont know if there's a separate wiring diagram for the z3, but just e36 will be fine though i'm sure) and they could pm it to me it'd really help me out.

    thanks,
    Leon
     
     

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    Dr of BMW gildersol's Avatar
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    Fuse F37 should do the licence plate lights and also feed the dimmer for all the backlighting.
    Are the licence plate lights working?
    Do the other switches light up? electric window switches etc

    Fuse F25 is for the high and low beam relay coils.
    Last edited by gildersol; 27-10-2009 at 21:09.
     
     

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    Quote Originally Posted by The Boz View Post
    ok i've just had a look in the fuse box and number 37 is the license plate light. the numbers 23, 27, 31 & 46 are listed under 'instrument cluster'.
    fuse 25 is common to all 'headlight' listings, and each 'headlight' listing (high-beam, low-beam, left, right) has its own individual fuse as well. can anyone tell me what fuse 25 is for?
    if anyone has a wiring schematic for the e36 (actually e36/7 - its a z3, dont know if there's a separate wiring diagram for the z3, but just e36 will be fine though i'm sure) and they could pm it to me it'd really help me out.

    thanks,
    Leon
    Leon - does this help? (see attachment!):


    * 2016 BMW M135i LCI (F20): current
    * 2016 Mercedes Benz GLA 200d AMG Line (X156): current
     
     

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    Quote Originally Posted by gildersol View Post
    Fuse F37 should do the licence plate lights and also feed the dimmer for all the backlighting.
    Are the licence plate lights working?
    Do the other switches light up? electric window switches etc

    Fuse F25 is for the high and low beam relay coils.
    firstly thanks for your time.
    right i think if i'm going to get to the bottom of this i need to be more specific:
    fuse 37 is fine. one license plate light is out, though i suspect this to be the bulb gone as the other works fine. am i wrong to presume this?
    no the window switches dont light up either. there's a backlight for the actual headlight switch itself, just underneath the switch, which is on all the time and works fine.
    on the dash the odometer works and is backlit. the main backlights for the tach, speedo, oil temp, and fuel dont work. the symbol lights on my dash for fog lights, handbrake, indicators, etc all work fine. but the symbol lights for the headlights and sidelights don't work.
    the heater controls backlight doesn't work, and if you open the door with the headlights on the buzzer doesn't sound.
    the interior light works fine.
    right i think that covers everything.

    thanks,
    Leon
    Last edited by The Boz; 28-10-2009 at 16:21.
     
     

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    Dr of BMW gildersol's Avatar
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    Any luck with this yet?

    Licence plate light probably a bulb
    Headlight switch backlight is on a circuit of its own so that's ok
    If the hazard switch/heated screen switch/fag lighter backlights don't work either I would suspect the dimmer switch may be faulty. You could run a wire from a known +12v to the back of any of these devices and touch it on the grey/red wire and see if that brings all the backlights on.

    As for the warning lights in the dash try a binnacle test to see if the bulbs are ok.
    http://www.bimmerforums.co.uk/forum/...nd-e46-t27446/

    The drivers door jamb switch signal goes to the instrument cluster and this, along with a feed form the light switch dimmer will be used to trigger the buzzer.

    Hope you can suss it out
     
     

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    ok i've just replaced the dimmer switch with a new one and still nothing. when i do the binnacle test the dials cycle to max n back down again but none of the warning lights come on like they do in that vid on youtube. The warning lights do come on temporarily though just when starting the car normally so i know they work.
    any thoughts of anything else i could check before taking to a professional?

    thanks for your time,
    Leon
     
     

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    Dr of BMW gildersol's Avatar
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    I would test for voltage on the grey/red wire at the back of the dimmer switch with the lights switch on and the dimmer full up.
     
     

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