Too much safety - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 03-19-2011, 08:37 AM Thread Starter
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Question Too much safety

Hello everyone,
My 1973 450 SEL w116 wont start because the seat belts warning light and buzzer does not go out when you plug in the seat belts. The system has worked fine up until today, the car has always started when both seat belts were plugged in.
I've tried disconnecting the wires from the seat belts under the seat and jumping them out and just leaving them unplugged, But I still have the same dilemma.
Is there a way to by-pass the seat belt warning system altogether? I promise to wear my seat belt even if the car starts without them plugged in.
Thanks for your help.
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post #2 of 4 (permalink) Old 03-20-2011, 08:12 AM
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The seat belts only disengage the buzzer - theres no engine interlock/override. I think you might have a different prob
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post #3 of 4 (permalink) Old 03-20-2011, 08:35 AM Thread Starter
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I ended up unplugging the buzzer from under the dash and disconnecting both seat belt wires and that did the trick. Now the car starts without having to have both seat belts fastened. I do however still wear my seat belt every time I drive the car.
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post #4 of 4 (permalink) Old 03-21-2011, 09:19 AM
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In the '73 and '74 models there was indeed an "over-ride" interlock. It wasn't on every car but some do have it. My '73 doesn't but my '74 does. It's one of the two relays mounted above the park brake assembly. I sprayed mine with contact cleaner, blew it out with compressed air and re-installed it. Haven't had a problem with it since (2 years).
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