[SOLVED] W124 electric mirrors not working

Discussion in 'Electronics' started by Dickie14, Apr 6, 2014.

  1. Dickie14

    Dickie14 New Member

    Messages:
    14
    Joined:
    Apr 6, 2014
    Car:
    W124 E220 Coupe
    Hi guys

    I've just acquired a lovely 1996 W124 E220 coupe, and everything electrical works bar the wing mirrors. I suspected a fuse but according to the manual they use the same fuse (fuse 'B') as the seatbelt butlers and they both work... Checking out the fuse box anyway I couldn't find any that had blown.

    Any ideas? Where should I look next? Would the switch itself be the next logical step, seeing as neither mirror works?

    Thanks in advance for any pointers!

    Cheers,
    Dickie
     
  2. kingdave

    kingdave Hardcore MB Enthusiast

    Messages:
    279
    Joined:
    Jan 3, 2010
    Location:
    Lingfield, Surrey
    Car:
    1984 R107 280SL, 2004 S211 E320, 2010 W169 A160 CDi a'gard
    Hi Dickie,
    I had my 124 in a garage for some work on the SRS -airbag system once, I'd discovered someone had removed the warning bulb in the instrument cluster from that some time in the past because it was showing a fault and I wanted to get it going again for safety, MOT and resale's sake. They fixed it, telling me they just had to reconnect a connector under the radio which is where the airbag ECU lives.
    (sorry for the digression - I'll get to the point)...
    When I got the car back, neither of the electric mirrors worked and I spent ages fiddling about with fuses because I couldn't understand it.

    Eventually I went to have a look a the switch in the centre-console and on lifting the wooden panel I found the wiring had come unplugged from the switch. Ironic since it must have been disturbed when the airbag one was fixed.

    It's easy to get at the switch, in-case you don't know:-
    - remove 2 screws from the front edge of the inside of the centre storage box (if fitted).
    - remove centre storage box
    - remove single screw retaining the bracket which holds the wooden panel for the electric window, mirrors and gear lever.
    - carefully lift the wooden panel from the rear electric windows end and take a look behind the mirrors joystick type switch.

    Cheers and good luck,
    Dave
     
  3. llewe

    llewe Active Member

    Messages:
    83
    Joined:
    Feb 14, 2013
    Location:
    Somerset
    Car:
    W124 E220 Estate, Sunbeam Stiletto, Citroen 2CV
    My money would be on the switch, either the connection or the switch itself. Check for power at the switch plug in bit with a multimeter to be sure.
    My switch was duff when i bought my car-someone had spilt sticky drink at sometime in the cars past which took it out along with two of the window switches.
     
  4. OP
    OP
    Dickie14

    Dickie14 New Member

    Messages:
    14
    Joined:
    Apr 6, 2014
    Car:
    W124 E220 Coupe
    Brilliant, thanks for the advice - I'll have a look under the console tomorrow. I'll let you know what I find...
     
  5. OP
    OP
    Dickie14

    Dickie14 New Member

    Messages:
    14
    Joined:
    Apr 6, 2014
    Car:
    W124 E220 Coupe
    Got the console up and everything was connected as it should be. Pulled the connector off the back of the switch and found there's no power getting to the connector... Time for another look at the fuse box I guess?
     
  6. coupe deville

    coupe deville Hardcore MB Enthusiast

    Messages:
    786
    Joined:
    Aug 21, 2008
    Car:
    93 E320 coupe sportline facelift
    Both mirrors ooo and no power at the switch, my money is on the fuse, might not be blown, just grotty
     
  7. OP
    OP
    Dickie14

    Dickie14 New Member

    Messages:
    14
    Joined:
    Apr 6, 2014
    Car:
    W124 E220 Coupe
    I triple-checked the fuses then cleaned them and checked again for luck. Still no power at the switch. Is there another connector in-line somewhere in the wiring loom for the mirrors? Not sure what else to try now...
     
  8. kth286

    kth286 Hardcore MB Enthusiast

    Messages:
    2,923
    Joined:
    Feb 4, 2003
    Location:
    Caversham Berks
    Car:
    E320 Coupe
    The feed to mirror comes from the Special Equipment connector block.

    You will likely find it in footwell behind side panel - driver side I believe.
     
  9. coupe deville

    coupe deville Hardcore MB Enthusiast

    Messages:
    786
    Joined:
    Aug 21, 2008
    Car:
    93 E320 coupe sportline facelift
    voltage chase is
    Battery, ignition switch, fuse box, special equipment connector block, mirror control switch, mirror motors.
    You say no power at mirror control switch, so we're looking upstream of that. Check if any voltage on fuse,
    yes, look at special connector block
    no, look at ignition switch
    and associated wiring for damage.
    You'll need a meter and a flask of coffee :dk:

    [​IMG]
     
  10. OP
    OP
    Dickie14

    Dickie14 New Member

    Messages:
    14
    Joined:
    Apr 6, 2014
    Car:
    W124 E220 Coupe
    That wiring diagram's great, thanks Dave. With the ignition on there's power at the fuse, so carpets up over easter...

    Is the Special equipment connector on the driver's side on RHD cars? I can only seem to find info/pictures about it on LHD cars, and I know Mercedes didn't bother to swap everything over.
     
  11. coupe deville

    coupe deville Hardcore MB Enthusiast

    Messages:
    786
    Joined:
    Aug 21, 2008
    Car:
    93 E320 coupe sportline facelift
  12. OP
    OP
    Dickie14

    Dickie14 New Member

    Messages:
    14
    Joined:
    Apr 6, 2014
    Car:
    W124 E220 Coupe
    FIXED!

    Turns out I was being a bit of a numpty - when I first checked the connector on the back of the switch for power, the ignition wasn't on! I'd assumed that as the windows had power surely the mirrors would too...

    So the switch was at fault all along. I found this thread on this forum:

    http://www.mbclub.co.uk/forums/electronics/4640-howto-blown-bulb-4-mirror-switch.html

    ...which gave me the confidence to pull mine apart rather than throwing £30 at eBay. Not entirely sure what was wrong with the switch as the microscopic components flew all over the place when I opened it, but after making sure my cat didn't inhale any of them and using my entire repertoire of swear words I had the b*stard back together, and now both mirrors work! Huzzah!

    Thanks very much for the help guys, very much appreciated!

    Cheers,
    Dickie
     
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