Low Beam Operation

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

With the lighting switch in 2ND position, the BCM (body control module) receives input requesting the headlamps to illuminate. This input is communicated to the IPDM E/R (intelligent power distribution module engine room) across the CAN communication lines. The central processing unit of the IPDM E/R controls the headlamp low relay coil. When energized, this relay directs power

to 15A fuse [No. 36, located in the IPDM E/R]
through terminal 20 of the IPDM E/R
to terminal 1 of headlamp RH, and
to 15A fuse [No. 45, located in the IPDM E/R]
through terminal 30 of the IPDM E/R
to terminal 1 of headlamp LH.
Ground is supplied at all times
to terminal 2 of headlamp LH and RH
through body grounds E9, E15 and E24.

With power and ground supplied, low beam headlamps illuminate.