Quote:
Originally Posted by anziani
I had the same problem with my '93 300CE in that the seats wouldn't lock. The small vacuum relay under the back seat was the culprit. The vacuum comes from forward on the engine. We removed this relay and put in vacuum tees. Everything works great. I'm not sure of the function off this relay though,
Anziani
'93 300CE 180K
'95 E420 117K
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This device sounds like the vacuum valve that is electrically controlled by the switch on the upper section of the center console to allow the rear head rests to return to the folded down position!