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Thread: HOW-TO: Replacing W124 interior headlight switch

  1. #1
    E500E Guru RicardoD's Avatar
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    HOW-TO: Replacing W124 interior headlight switch

    My 1994 E500 headlight switch started getting finicky, sometimes stuck, and telling me it needs to be replaced. There is a fantastic HOW-TO at Pelican Parts:

    LINK HERE: https://www.pelicanparts.com/techart...ght_Switch.htm

    A couple of notes (some un-needed steps):
    - I did NOT need to remove my lower kick panel
    - I did NOT need to disconnect the parking brake release cable from the handle

    Headlight switch part number: 000-545-62-04 (it was $62 at mboemparts.com as of spring 2018)

    Tools: 8mm socket, phillips head screw driver, 24mm socket or needle nose pliers, plastic interior trim removal pry bar.

    This is a straight forward job, just take your time. My switch lasted 168k miles and I think I will never be replacing this switch again.

    In case Pelican Parts link does not work at some time in the future I have attached a PDF of the instructions and photos.
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    Last edited by RicardoD; 03-04-2018 at 06:52 PM.
    RicardoD
    1990 964 C4 / 1991 964 C2 tip
    1994 E500
    1991 560SEC
    2014 E350 for wife

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  3. #2
    .036 Hoonigan™
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    Re: HOW-TO: Replacing W124 interior headlight switch

    Thanks for the write-up, Ricardo! I've had this switch fail on multiple cars. I had been replacing them with used switches from P+P ($10 or so) but after a couple of those failed again, now I'm only buying new. Well worth it at $60.

    Dave M.
    1997 E420 (Bugeyes)
    1994 E420 (Blondie)
    1994 E500 (Q-ship)
    1992 500E (Mach 5)
    1987 300D (Sportline Stage 2)
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  5. #3
    postwhore posterchild Klink's Avatar
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    Re: HOW-TO: Replacing W124 interior headlight switch

    That switch is also a frequent cause of false or intermittent bulb failure warning lamp illumination. Once that switch starts to feel funny, replace it, or you can be stranded at night without headlamps. Manipulation of the switch won't always get them to turn on once it fully fails...
    Putting the fun in dysfunction...

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  7. #4
    E500E Guru nocfn's Avatar
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    Re: HOW-TO: Replacing W124 interior headlight switch

    Ignition switch too
    1994 E500
    249/275 - 8F19 or 8F32 or 8320

    1991 560 SEC
    199/268
    2014 E350 Cab 799/264

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  9. #5
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    Re: HOW-TO: Replacing W124 interior headlight switch

    Just a quick note of clarification on this: this thread is not a real "HOW-TO" because it only IDENTIFIES an issue and discusses the replacement, and describes an overview of things, but does not actually have a photographically and textually documented step-by-step HOW-TO procedure.

    Linking to other sites' procedures is not an appropriate way to do a HOW-TO on this site. Our value-add is the actual in-depth walk-through of the job, along with the commentary. We do our own processes, organically, and provide our own information, photos and text. We strive to make our HOW-TO content superior and more in-depth to other sites' content.

    I have no issue with using other sites' HOW-TO information (which often doesn't directly apply to E500E-specific jobs), but they should not be exclusively used and represented as a HOW-TO here. They are fine to use as a follow-on post or as supplemental -- but never primary -- material.

    Thanks
    Gerry

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  11. #6
    E500E Guru RicardoD's Avatar
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    Re: HOW-TO: Replacing W124 interior headlight switch

    Makes sense Gerry. Feel free to retitle or relocate to a different forum. I just want a landing spot for anyone that is searching for headlight switch on this forum.
    RicardoD
    1990 964 C4 / 1991 964 C2 tip
    1994 E500
    1991 560SEC
    2014 E350 for wife

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  13. #7
    E500E Guru Jlaa's Avatar
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    Re: HOW-TO: Replacing W124 interior headlight switch

    Thanks for relaying this procedure Ricardo. My headlight switch broke over the weekend. The switch still conducts electricity but the detents feel really "mushy". Car has 66K miles on it.
    ---
    1993 MB 500E
    1996 Porsche 993 C2

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  15. #8
    E500E Guru Jlaa's Avatar
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    Re: HOW-TO: Replacing W124 interior headlight switch

    I replaced the switch with a new $61 one from Naperville MB. As with Ricardo, I did not need to remove the lower kick panel nor the parking release cable. Now the new switch is in and everything is back to normal --- automobile-dom's highest effort finger strength headlight switch is back! Note --- the old switch was feeling mushy, and when I shake the old switch, I can hear plastic pieces rattling around.
    ---
    1993 MB 500E
    1996 Porsche 993 C2

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  17. #9
    E500E Guru RicardoD's Avatar
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    Re: HOW-TO: Replacing W124 interior headlight switch

    Awesome! Hard to believe the effort on the new switch but feels properly German overbuilt!
    RicardoD
    1990 964 C4 / 1991 964 C2 tip
    1994 E500
    1991 560SEC
    2014 E350 for wife

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  19. #10
    .036 Hoonigan™
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    Re: HOW-TO: Replacing W124 interior headlight switch

    Photos of the inside of a busted one are below.

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  21. #11
    E500E Guru Jlaa's Avatar
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    Re: HOW-TO: Replacing W124 interior headlight switch

    Mine had clearly seen better days.
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    ---
    1993 MB 500E
    1996 Porsche 993 C2

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  23. #12
    Member IBNR's Avatar
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    Re: HOW-TO: Replacing W124 interior headlight switch

    Just did this job today, nice and easy and the new headlight switch works and feels great...as others have noted, no need to remove the lower kick panel or disconnect the parking brake release. I didn't bother taking apart the old switch; it rattles like a toy maraca so I'm sure it was in at least as bad shape as the others pictured here!

    Anyway, this is probably a long-shot but does anyone know where I could get a replacement for the tiny little light bulb that goes into the black connector socket that attaches to the top of the white plastic backing of the headlight switch indicator trim surround (see Step/Figure 7 in the Pelican Parts tutorial Ricardo posted)? Mine has been burnt out forever, and I broke it just now trying to remove it from the socket. The bulb is very, very small with just a glass connector terminal and it appears to be frosted...but I cannot see any numbers or writing on it at all to identify a replacement.

    Note, I'm not talking about the little bulb that goes in the tip of the switch and lights up when the rear fog light is on, rather the bulb that goes inside the trim panel itself to illuminate the headlight switch indicator positions...or at least I guess that's what it does, since I can't remember it ever working on my car!

    EDIT: FOUND IT IN THE WIKI...THANKS!
    Last edited by IBNR; 09-12-2018 at 09:57 AM.
    Thanks,
    Mike
    1994 Mercedes RENNtech E500 - Pearl Black/Black
    2007 Mazdaspeed3 GT - True Red
    2009 BMW K1300S - Sapphire Black/Granite Grey/Magma Red Tri-Color

  24. #13
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    Re: HOW-TO: Replacing W124 interior headlight switch

    Mike the illumination bulb should be p/n 000000-001061 for clear, and p/n 000-825-00-94 for frosted. See EPC group 54, subgroup 395, callout 158. OE bulbs now add suffix -64 to the p/n likely indicating a supplier change.

    I think the frosted ones are only used on the dash vent rollers, and are NLA from MB... supercedes to the clear bulb. However, the frosted bulbs are still available aftermarket (Importec has Jahn 22-8875-094 frosted bulbs).

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  26. #14
    Member IBNR's Avatar
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    Re: HOW-TO: Replacing W124 interior headlight switch

    Thanks! I found a pack of 10 of the frosted ones for sale on eBay under the p/n you provided (and as listed in the Wiki) for $11 so I jumped on it...if those end up being wrong for some reason I'll look into the Jahn ones you mention.
    Thanks,
    Mike
    1994 Mercedes RENNtech E500 - Pearl Black/Black
    2007 Mazdaspeed3 GT - True Red
    2009 BMW K1300S - Sapphire Black/Granite Grey/Magma Red Tri-Color

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  28. #15
    E500E Guru Trae's Avatar
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    Re: HOW-TO: Replacing W124 interior headlight switch

    My headlights (1992 500E) suddenly quit working on low and high beam when selected.

    High beam works when stalk is pulled. . .quits working when released. Headlight selector knob feels tight. All copper fuses are good.

    Should I order A 000 545 62 04? EPC says it is a light rotary switch.

    Knob is A 202 545 00 81, but the current knob feels tight.
    Trae
    1992 500E Renntech
    1993 500E
    1990 560SEC/ 2001 SL500
    1991 560SEC ECE/1995 E320 Cabriolet

  29. #16
    E500E Guru nocfn's Avatar
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    Re: HOW-TO: Replacing W124 interior headlight switch

    is it the original headlight switch? If so, I would trade it out in all of your cars if original. Same concept for several models you own.
    1994 E500
    249/275 - 8F19 or 8F32 or 8320

    1991 560 SEC
    199/268
    2014 E350 Cab 799/264

  30. #17
    E500E Guru Trae's Avatar
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    Re: HOW-TO: Replacing W124 interior headlight switch

    Ordered switch. . .let you know.

    Thanks Louis
    Trae
    1992 500E Renntech
    1993 500E
    1990 560SEC/ 2001 SL500
    1991 560SEC ECE/1995 E320 Cabriolet

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