93 Maxima power door locks

just bought this car, and the power locks won't work, my first thought is the switch in the doors, but none of them are working... could the main on the drivers door cause them all not to work, or is there a bigger problem? any help is appreciated. as well, if locked with a key, it sometimes won't unlock, unless you pull up on the lock. ???

check link below

there is a lock timer under the dash by the steering colum
it receives a signal from the drivers door a negative signal or an open signal
which then powers the locks

there is a lock timer under the dash by the steering colum
it receives a signal from the drivers door a negative signal or an open signal
which then powers the locks


thank you. I'll take a look at that. the dealer wants $125 for the new door switch, cuz it comes with all the window switches too. I don't need all that, just need to lock this thing.