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It is easy to test the central lock pump, in the car or on the bench.
1) Connect 12v to pump with the rectangular connector.
2) Remove the round plug.
3) Disconnect the vacuum line leave it open.
4) Use a wire, ground one end to chassis and touch the pins where the round plug is inserted. Any pins will do. It will activate the pump to suck ( to lock the door, so to speak ). There is no vacuum line so it will keep sucking for approx 30 sec and times out. The pump is in lock state.
5) Use a wire, connect one end to 12v and touch the pins, any of the 3, and the pump will push air ( to unlock, so to speak ). It will time out also as there is no vacuum line. Pump is now in unlock state.
6) Redo step (4) and (5) but with the vacuum line plugged. You should find the pump stops immediately as it thinks the door is fully lock or fully unlocked.
Hope this help.
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