Central Locking (1985 300SD)
 

I have an odd problem with the central locking on my 85 300SD. The vacuum pump in the trunk is dead. I disconnected the wires (red & black as well as the yellow, blue and brown from the circular plugin) from the pump. The problem is I have constant power on all the wires (red, yellow and blue) even with the wires disconnected from the pump. I am thinking this burned up the pump. When I cycle the key in the driver, passenger and trunk, the light does blink, but stays lit.

Any help much appreciated!

Richard

Mine had one under rear seat too, for doors., check relays and fuses