I have an 85 300SD in which the door locks which run from a pump in the trunk is not working. Meaning the pump does not turn on when the door key switch is turned. The pump is "000 800 05 48. There are two connectors on the pump. One 2 pin connector is for power and the other I assume is for the door lock controls of either vacuum or pressure.

The one for power I've measure and there is 12 VDC at the connector. The second pin in that connector is brown and goes to ground.


With 12 VDC applied to the pump, shouldn't the pump come on ?