Power Supply And Ground

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

through 10A fuse [No. 21, located in the fuse block (J/B)]
to key switch terminal 3 and
to BCM (body control module) terminal 42
through 50A fusible link (letter f, located in the fuse and fusible link box)
to BCM (body control module) terminal 55.

When the key is inserted in key switch, power is supplied

through the key switch terminal 4
to BCM (body control module) terminal 37.

With the ignition switch in the ON or START position, power is supplied

through 10A fuse [No. 1, located in the fuse block (J/B)]
to BCM (body control module) terminal 38.

Ground is supplied at all times

to BCM (body control module) terminals 49 and 52
through grounds terminals M57, M61 and M79.

When the driver side door is opened, ground is supplied

through case ground of front door switch LH
to BCM (body control module) terminal 62.

When the passenger side door is opened, ground is supplied

through case ground of front door switch RH
to BCM (body control module) terminal 12.

When the rear door LH is opened, ground is supplied

through case ground of rear door switch LH
to BCM (body control module) terminal 63.

When the rear door RH is opened, ground is supplied

through case ground of rear door switch RH
to BCM (body control module) terminal 13.

When the driver side door is unlocked by the door lock and unlock switch, BCM (body control module) receives a ground signal

through grounds terminals M57, M61 and M79
to power window main switch terminal 17 (door lock and unlock switch) or front power window (passenger side) terminal 11 (door lock and unlock switch)
from power window main switch terminal 14 (door lock and unlock switch) or front power window (passenger side) terminal 16 (door lock and unlock switch)
to BCM (body control module) terminal 22.

When the front driver side door is unlocked by the driver side door lock assembly (door key cylinder switch), BCM (body control module) receives a ground signal

through grounds M57, M61 and M79
to front door lock assembly (driver side) (door key cylinder switch) terminal 5
from front door lock assembly (driver side) (door key cylinder switch) terminal 1
to power window main switch terminal 4 (door lock and unlock switch)
from power window main switch terminal 14 (door lock and unlock switch)
to BCM (body control module) terminal 22.

When a signal, or combination of signals is received by BCM (body control module), ground is supplied

through BCM (body control module) terminal 48
to interior room lamp terminal 6 and
to foot lamp LH and RH terminal -.

With power and ground supplied, the interior lamp illuminates.