Ignition Key Warning Chime

WARNING: This page is about a different car, the 2006 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.

With the key inserted in the ignition switch, the ignition switch in OFF position, and the driver's door open, the warning chime will sound.

Power is supplied

through key switch and key lock solenoid terminal 4 (floor shift) or key switch terminal 4 (column shift)
to BCM terminal 37.

Ground is supplied

to BCM terminal 47
through front door switch LH terminal 2
through body grounds B7 and B19 (king cab) or through front door switch LH case ground (crew cab).

BCM detects key inserted into the ignition switch, and sends key warning signal to combination meter via CAN communication lines. When the combination meter receives key warning signal, it sounds warning chime.