Thanks for previous helpbut still have problem.Central locking pump cycles ok on lock(ie positive pressure)but time cycles out on vacuum side(ie unlock).As there is only one tube at the pump how do I test the system to find the problem?I pulled off the drivers side door lining but the keylock only has wires to it but no vacuum/pressure line,although there is a small short pipe which is part of the(blue color)lock.Any ideas or shortcuts would be appreciated.Thanks Wazza.

Go to the trunk and test the fuel actuator.

Also check the door that is the slowest.

You will have to test the vacuum lines individually to find the leak.

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Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS