I am not familer with the W140, but on the W126 which isn't all that unlike your car the trunk vacuum pump is on its own system. Other then draining the battery I fail to see how one would prevent the car from starting. Unless on the W140 its somehow related to the alarm system.


If your battery is dead the lights will still come on inside the car, usualy the radio will as well. The starter draws a lot of load, a lot more then anything else on the car.

Turning the key and hearing a click is usualy a dead give away for either a dead battery or, a bad starter solinod.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200