R129 SL - ADS switch not illuminating.

Discussion in 'Interior' started by Hartzpartz, Jan 6, 2007.

  1. Hartzpartz

    Hartzpartz Hardcore MB Enthusiast

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    Has anyone removed any of the console switches on their R129 SL?

    The night-time illumination of my ADS switch doesn't appear to work so I assume there is a small bulb unit in the switch itself?

    Does the wooden trim have to be removed? (and if so, how is it secured?). Looks expensive so I thought I'd seek advice before charging in!

    Thanks in advance.
     
  2. rajinder_1

    rajinder_1 Hardcore MB Enthusiast

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  3. stats007

    stats007 MB Club Veteran

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    The switches are N/S unless you take them apart. You also need to remove the wood trim. I have a video for this - not hard, but fiddly and will take about an hour to remove and refit.

    Edit - Video Uploaded:

    [​IMG]
     
    Last edited: Jan 7, 2007
  4. OP
    OP
    Hartzpartz

    Hartzpartz Hardcore MB Enthusiast

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    Last night as I was turning off the ignition, I noticed that the switch momentarily lit up (a very brief flicker). I'm assuming from this event that the fault may lie elsewhere, although it's strange that the other switches illuminate correctly.

    Anyone got a wiring diagram for the ADS circuit?
     
  5. BTB 500

    BTB 500 MB Club Veteran

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    If it's just the night-time illumination (i.e. the red light goes on and off OK when you operate the switch) I doubt it's anything to do with the ADS itself.

    Out of interest, what year is the car?
     
  6. stats007

    stats007 MB Club Veteran

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    I have wiring diagrams for cars up to 1996 - it should be very easy to test without one though. All the switches should share the same pin or wire colour for illumination.
     
  7. OP
    OP
    Hartzpartz

    Hartzpartz Hardcore MB Enthusiast

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    Thanks for your replies .........

    I have now read my manual properly and although the ADS fault warning light (in the instrument cluster) lights up when the ignition is on and then goes out with the engine running, I can't get the red LED in the ADS switch to light when the switch is pressed.

    At first I thought it was just the switch illumination that didn't work as I didn't notice the LED! Upon closer inspection, both the LED and the switch illumination flicker when the ignition is turned off.

    This is a 1991 car which had £5400 (this isn't a typo) spent by the previous owner on the ADS system so I assume it can't be anything major.

    Any info on fuse, relay and control module location would be greatfully received. That wiring diagram would be useful too please (Stats007)

    Thanks for your help so far........
     
    Last edited: Jan 8, 2007
  8. stats007

    stats007 MB Club Veteran

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    First question - does the ADS actually work?

    £5400 isn't uncommon - another chap bought a '91 500SL on here and the previous owner had spent the same - unless that was you? I can't remember who bought that car I posted on here.
     
    Last edited: Jan 8, 2007
  9. BTB 500

    BTB 500 MB Club Veteran

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    Being pedantic, as Stats hinted in his reply ... your car is a 500SL then, rather than an SL500.

    Yes the key question is whether it's just the illumination on the switch that's not working, or the ADS itself. Can you feel the difference when you switch modes while driving? Does the raise switch work, and do the LEDs on that illuminate?
     
  10. stats007

    stats007 MB Club Veteran

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    I can't remember if ADS 1 has the raise setting. Your car has ADS 2 (introduced with 'MY96), Bill - there were quite a few changes.
     
  11. BTB 500

    BTB 500 MB Club Veteran

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    Ah, ok, I didn't know there were different versions - thanks.
     
  12. stats007

    stats007 MB Club Veteran

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    Did you know ADS2 can be programmed to operate differently?
     
  13. BTB 500

    BTB 500 MB Club Veteran

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    No, tell me more!
     
  14. stats007

    stats007 MB Club Veteran

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    I thought you might say that! I don't think it's anything special - just the way the car moves between settings at speed.
     
  15. BTB 500

    BTB 500 MB Club Veteran

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    OK, I just wondered if there was a way to lower the car slightly - mine has always seemed to sit a little higher than R129s with normal suspension. It's just a visual thing, no complaints about the ride or handling.
     
  16. stats007

    stats007 MB Club Veteran

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    I don't think so - ADS you can only raise the car (15mm & 30mm) or swap damper settings.

    [​IMG]

    If you can decipher that, do let me know!
     
  17. stats007

    stats007 MB Club Veteran

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  18. OP
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    Hartzpartz

    Hartzpartz Hardcore MB Enthusiast

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    My car does have the raise switch and that all works fine.

    I thought the ADS works all the time but just stiffens up the damping a bit quicker if the ADS switch is pressed?

    Any tried and tested methods of knowing if the ADS is working? As I said before, the main ADS fault lamp goes out with the engine running.

    PS Mine is the car that you posted Stat007.
     
    Last edited: Jan 8, 2007
  19. stats007

    stats007 MB Club Veteran

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    ADS does work all of the time in it's damping capacity - but the ride height can also be adjusted with the raise switch.

    If the fault light goes out and you can raise and lower the car then I'd say it was working.
     
  20. OP
    OP
    Hartzpartz

    Hartzpartz Hardcore MB Enthusiast

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    Just a shame the LED/switch illumination doesn't work..............:confused:
     

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