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Red button in boot to lift roof up not working

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by Paul Sander, Jul 29, 2020.

  1. Paul Sander

    Paul Sander Senior Member

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    Your Mercedes:
    2003 SL600
    Hi everyone,
    I posted this issue before but now it's more urgent as the car is in the garage and they don't seem to know where to look and my money is rapidly disappearing...

    So when I retract the roof into the boot and open the boot the red button is lit up (so assume there is a live feed there).

    But when I press it.. Nothing... No noises, clicks... Nada

    Does anyone have the wiring diagram or any idea how the mechanism works?

    Your speedy replies would help reduce the rapid drain on my wallet.... :-(

    Paul
     
  2. 00slk

    00slk Senior Member

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    Your Mercedes:
    2002 SL55 AMG, 2005 SL500 2009 SLK350
    A slight possibility it is the red button switch itself??
     
  3. Gary5

    Gary5 Senior Member

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    Your Mercedes:
    SL350 R231 2013; Classic Fiat 500L 1972; Volvo S90 2020
    Hi Paul, when I lift the boot lid up on my R231 SL350 with the roof folded in the boot, as soon as the boot lid is fully up, the folded roof lifts up to allow storage access, the boot lid is the trigger for this movement. The red button is what I press to close the roof back down into the boot, then I can close the boot lid safely. Sorry if I am teaching you to suck eggs, I am not sure if I have interpreted your issue correctly, just thinking aloud. Cheers
     
  4. LostKiwi

    LostKiwi Senior Member

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    Your Mercedes:
    '93 500SL-32, '01 W210 Estate E240, 02 R230 SL500 (Malcolm Spec), 04 Smart Roadster Coupe
    On an r230 you need to push the red button to gain access and lift the folded roof away. Then press again to lower it.
    The prerequisite for it to lower again is the separator must be closed. First place I'd look is the separator microswitch. Also check the microswitches for roof in access position are good. Then start checking for broken wires.
     
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  5. OP
    Paul Sander

    Paul Sander Senior Member

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    Your Mercedes:
    2003 SL600
    Thanks for the replies,
    I have replaced the separator switch already.
    The garage has checked continuity and thinks it's the ECU...but Star had not shown any. faults.. So am reticent to buy a new one if e can't prove conclusively that it is this unit.
    Even though the red button lights up I'm going to replace it, as it is the cheaper option. And if it still doesn't work then at least we can then discount this switch from being the issue...

    But I really need to find a wiring diagram..

    Paul
     
  6. rorywquin

    rorywquin Senior Member

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    Your Mercedes:
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    On mine I have to push the bootlid to make sure it is fully open before the tilting mechanism will work.
     
    MARIE BENTON likes this.
  7. LostKiwi

    LostKiwi Senior Member

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    '93 500SL-32, '01 W210 Estate E240, 02 R230 SL500 (Malcolm Spec), 04 Smart Roadster Coupe
    This is r230 but may help.
     

    Attached Files:

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  8. Gary5

    Gary5 Senior Member

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    Snap
     
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  9. rorywquin

    rorywquin Senior Member

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    I don't think mine (boot opening) automatically tilts the roof. I'd test it but, it is day 2 going into day 3 with the car in the MB workshop to get the maps updated. :mad: The incompetence beggars belief.
     
  10. David Arnott

    David Arnott Senior Member

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    Attached is the wiring diagram.
    The later r230s (after 2007) have the auto tilt up.
     

    Attached Files:

  11. OP
    Paul Sander

    Paul Sander Senior Member

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    Many thanks...
     
  12. rorywquin

    rorywquin Senior Member

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    I need to investigate - after 3 years of ownership, I've not noticed that on mine. Does make sense!
     
  13. bluesl

    bluesl Member

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    I think you need to check the boot lid limit switch, S124. That tells the control unit that the boot lid is fully raised so that the packaged roof can be safely raised.
     
    Last edited: Jul 30, 2020
  14. bluesl

    bluesl Member

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    • The switch is hidden behind the trim on the right boot hinge...

    8DF2EAB0-006D-479E-A57F-5400C24D7A1D.jpeg
     
  15. rorywquin

    rorywquin Senior Member

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    My boot opening is manual (no button inside the car and not keyless) so I have to press the red button in the boot to make the roof tilt.
     
  16. MARIE BENTON

    MARIE BENTON New Member

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    Yes. Same here. I need to hold the boot lid up as far as it can go and push the button.
     
  17. OP
    Paul Sander

    Paul Sander Senior Member

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    Your Mercedes:
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    So found out what the issue is... The roof control module.
    From MB...£697 plus tax
    eBay: £90
    The garage has stripped out the car so I asked them to leave it because I need to get to the module. (It's under the rear fuseboard)
    Will take some photos if anyone would be interested...
     
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  18. bluesl

    bluesl Member

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    Would certainly be interested, let’s hope the replacement module fixes the problem.

    There's good business to be had for someone who has the skills to fix these modules.

    I have an old Ferrari F355 which came into being just as electronics in cars was getting established and a replacement aircon ECU - if you can get one - is £4700.

    Similarly, a Porsche 911’s instrument cluster failed - one of the “dials” is a $20 LCD - but the part from Porsche is £2700.

    I visited MB Classic Restoration in Bad Canstatt a few years ago and the opinion there was that in the future, cars with perfect mechanicals will be scrapped because the electronics needed to run them/keep them street legal will be long gone.
     

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