System Description: Notes

WARNING: This page is about a different car, the 2004 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

Power is supplied at all times

to BCM terminal 55
through 50A fusible link (letter f, located in the fuse and fusible link box)
through 10A fuse [No. 21, located in the fuse block (J/B)]
to key switch and keylock solenoid terminal 2
to BCM terminal 42.

With ignition key inserted, power is supplied

through key switch and keylock solenoid terminal 1
to BCM terminal 37.

Ground is supplied to terminals 49 and 52 of BCM through body grounds M57, M61 and M79.

When the door is locked or unlocked with main power window and door lock/unlock switch, ground is supplied

to CPU of main power window and door lock/unlock switch
through main power window and door lock/unlock switch terminal 17
through grounds M57, M61 and M79.

Then main power window and door lock/unlock switch operation signal is supplied.

to BCM terminal 22
through main power window and door lock/unlock switch terminal 14.

When the door is locked or unlocked with front power window switch RH, ground is supplied

to CPU of front power window switch RH
through front power window switch RH terminal 11
through grounds M57, M61 and M79.

Then front power window switch RH operation signal is supplied

to BCM terminal 22
through front power window switch RH terminal 16.

When the door is locked with front door key cylinder switch LH, ground is supplied

to main power window and door lock/unlock switch terminal 4
through key cylinder switch terminals 1 and 5
through grounds M57, M61 and M79.

Then key cylinder switch operation signal is supplied

to BCM terminal 22
through main power window and door lock/unlock switch terminal 14.

When the door is unlocked with front door key cylinder switch LH, ground is supplied

to main power window and door lock/unlock switch terminal 6
through key cylinder switch terminals 6 and 5
through grounds M57, M61 and M79.

Then key cylinder switch operation signal is supplied

to BCM terminal 22
through main power window and door lock/unlock switch terminal 14.

BCM is connected to main power window and door lock/unlock switch and front power window switch RH through a serial link.

When the front door switch LH is ON (door is open), ground is supplied

to BCM terminal 62
through front door switch LH terminal 2
through front door switch LH case ground.

When the front door switch RH is ON (door is open), ground is supplied

to BCM terminal 12
through front door switch RH terminal 2
through front door switch RH case ground.

When the rear door switch LH is ON (door is open), ground is supplied

to BCM terminal 63
through rear door switch LH terminal 1
through rear door switch LH case ground.

When the rear door switch RH is ON (door is open), ground is supplied

to BCM terminal 13
through rear door switch RH terminal 1
through rear door switch RH case ground.