Power Supply And Ground

WARNING: This page is about a different car, the 2008 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. 2, located in the fuse block (J/B)]
To key switch and ignition knob switch terminal 3, and
Through 50A fusible link (letter f, located in the fuse and fusible link box)
To BCM terminal 70.

When the key is inserted in key switch and ignition knob switch, power is supplied

Through the key switch and ignition knob switch terminal 4
To BCM 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 terminal 38.

When the BCM receives input to supply power to terminal 56, power is supplied

To front and rear step lamp LH and RH terminal 1
To rear console lamp (with rear console) terminal 2
To ignition keyhole illumination terminal 1
To foot lamp LH and RH terminal 1
To vanity mirror lamp LH and RH terminal 1
To personal lamp terminal 2
To interior room lamp terminal 7, and
To trunk room lamp terminal 1.

Ground is supplied

To BCM terminal 67
Through grounds M57, M61 and M79.

When the front door LH is opened, ground is supplied

To BCM terminal 47
Through front door switch LH terminal 2
Through case ground of front door switch LH

When the front door RH is opened, ground is supplied

To BCM terminal 12
Through front door switch RH terminal 2
Through case ground of front door switch RH.

When the rear door LH is opened, ground is supplied

To BCM terminal 48
Through rear door switch LH terminal 1
Through case ground of rear door switch LH.

When the rear door RH is opened, ground is supplied

To BCM terminal 13
Through rear door switch RH terminal 1
Through case ground of rear door switch RH.

When the front door LH is unlocked by the door lock and unlock switch, BCM receives serial data

To BCM terminal 22
Through main power window and door lock/unlock switch terminal 14 or power window and door lock/unlock switch RH terminal 16.

The main power window and door lock/unlock switch receives a ground signal

To main power window and door lock/unlock switch terminal 17
Through grounds M57, M61 and M79.

The power window and door lock/unlock switch RH receives a ground signal

To front power window and door lock/unlock switch terminal 11
Through grounds M57, M61 and M79.

When the front door LH is unlocked by the front door lock assembly LH (key cylinder switch), BCM receives serial data

To BCM terminal 22
Through main power window and door lock/unlock switch terminal 14.

And the main power window and door lock/unlock switch receives a ground signal

To main power window and door lock/unlock switch terminal 6
Through front door lock assembly LH (key cylinder switch) terminal 6
Through front door lock assembly LH (key cylinder switch) terminal 5
Through grounds M57, M61 and M79.

When a signal or combination of signals is received by BCM, ground is supplied

To personal lamp terminals 4 and 6
Through interior room lamp (room/map lamps) terminal 5, and
To interior room lamp (room/map lamps) when interior room lamp switch is in AUTO
Through interior room lamp (room/map lamps) terminal.

With power and ground supplied, the interior lamp illuminates.