We have a 2000 Silhouette, the doors lock when the van is put into drive but will not lock when the lock button is pushed on either the driver or passenger side. The unlock button works fine on both sides.
Since the doors unlock when the van is put into park, I cannot lock my vehicle without opening each door & locking them manually & then cannot lock the hatch because the doors will not lock with the key either.
You need to have someone or yoursef check the body control module with a compatible scan tool. Thats where the problem you are having resides. It may need a software update or replacement. You can also disconnect the battery for a few minutes, that will cause the BCM to reset and may fix it.
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1999 olds silhouette electric locks won't lock or unlock with remote or door buttons. Locks do lock and unlock when put in gear and engine is shut off. all doors unlock and lock when key is inserted in doors.
Lock on manual sliding door will not lock with remote but will lock using remote. Lock seems to be bound up. When manually locking it is difficult to depress lock in order to lock.
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