Without Intelligent Key System

WARNING: This page is about a different car, the 2007 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.

When room lamp switch is in DOOR position, and when all conditions below are met, BCM performs timer control (maximum 30 seconds) for room lamp ON/OFF.

In addition, when the interior room lamp turns ON or OFF there is gradual brightening or dimming over 1 second.

Power is supplied

through 10A fuse [No. 19, located in fuse block (J/B)]
to key switch terminal 2.

When the key is removed from ignition key cylinder (key switch OFF), power will not be supplied to BCM terminal 37.

When front door lock assembly LH (key cylinder switch) is unlocked, ground is supplied

to BCM terminal 7
through front door key cylinder switch LH terminal 5
through front door key cylinder switch LH terminal 4
through grounds M57 and M61.

At the time that front door LH is opened, BCM detects that front door LH is unlocked. It determines that interior room lamp timer operation condition is met, and turns the room lamp ON for 30 seconds.

When key is in ignition key cylinder,

Power is supplied

through key switch terminal 1
to BCM terminal 37.

When key is removed from key switch (key switch OFF), the power supply to BCM terminal 37 is terminated. BCM detects that key has been removed, determines that interior room lamp timer conditions are met, and turns the room lamp ON for 30 seconds.

When front door LH opens → closes, and the key is not inserted in the key switch (key switch OFF), voltage at BCM terminal 47 changes between 0V (door open) → 12V (door closed). The BCM determines that conditions for room lamp operation are met and turns the room lamp ON for 30 seconds.

Interior room lamp timer control is canceled under the following conditions

Front door LH is locked (locked front door key cylinder switch LH).
Front door LH is opened (front door switch LH).
Ignition switch ON.