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Old 11-18-2012, 12:03 PM
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Join Date: May 2011
Posts: 21
crazy flashing of Seat Belt and Glow Plug lamps

300SD, 424,000 miles. All is great, but I am now seeing random flashes from the seat belt warning light, after a day or two of that the glow plug light started randomly flashing while driving.
I am guessing there is a solid state module somewhere that controls the timers on these lights and it is dying.
Anybody know what it is called, where it is, how to repair or test?

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Old 11-18-2012, 12:16 PM
ytmtnman's Avatar
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Join Date: Jul 2006
Location: Acworth, NH
Posts: 277
I just had the same problem. My buzzer would come on too, unless I was buckled. My problem was with the glow plug relay. I had a relay from a 603 in my 617. You probably don't have the same relay as I did. Just letting you know what fixed my blink problem.
I could not own any MB without the help from you...fellow forum members.

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Old 11-18-2012, 02:02 PM
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Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,392
Your relay was from a 602 not a 603 matt. I'm glad that fixed it though

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