g35 sedan having lock/unlock wiring issue

Double pulses are required for unlock.  You should be able to program your alarm to double pulse without a bitwriter.

Two chirps doesn't mean a double pulse unlock.

If the BCM is damaged and your doors won't unlock with the OEM switch your alarm isn't going to be able to unlock the doors either (unless you 5 wire them).  The (-) pulse tells the BCM to fire the relays - if your BCM is damaged this obviously won't do anything.  You need to focus on repairing / replacing the BCM before the alarm will be able to unlock the doors.

The major disadvantage about doing the door locks as Chris suggested is you won't be able to rasie and lower the windows with the alarm by simply extending the (-) triggers on the lock and unlock wires.   To me personally, this is well worth the hassle of getting wires inside the doors.

I'm speaking from my experience here!

On the generation of nissans before the latest one, the actuator motors were all tied in to unlock, but all doors except the driver's door was tied in with the lock circuit a separate circuit controlled this, hence you could unlock all doors if they were all locked, but only lock all except the driver's door using the negative trigger wires.

So actually there is no burnt trace on any if his BCM's, or else none of the actuators woud have functioned, all he has to do is locate his lock motor wire from the driver's door and connect this to the lock motor wire from the other doors and he would be set, since the trigger wires are already connected, this would also allow the rocker control to lock and unlock all four doors!

The way the current gen Nissans work is they have a common LOCK wire and seperate UNLOCK wires.  This is solely for priority door locks.  The drivers door and the gas door are on one UNLOCK circuit and the passenger door(s) are on the other.  He has burnt up the trace on the drivers door UNLOCK relay.  Since there is no ground on the UNLOCK wire when the LOCK output turns on the actuator isn't seeing a ground so the drivers door isn't locking.  However, when you hit the UNLOCK button the burnt trace is switched to 12vdc and the door unlocks.

I can pretty much guarentee his problem is a burnt trace on the BCM board and should be an easy fix.

Point taken kevin! It's actually reversed on my side of the pond, the unlock is on a common circuit and the lock on a separate circuit! In any event if he took the lock motor wire on the driver door to the other lock motor wires he should achieve the same end result!

Also kevin, i'm confused, the burnt trace won't allow the leg to see ground but current still flows through!