High Beam Operation/Flash-to-Pass Operation

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.

With the lighting switch in 2ND position and placed in HIGH or PASS position, the BCM (body control module) receives input signal requesting the headlamp high beams to illuminate. This input signal is communicated to the IPDM E/R (intelligent power distribution module engine room) across the CAN communication lines. The CPU (central processing unit) in the IPDM E/R controls the headlamp high relay coil and low relay coil, which when energized, directs power

to 15A fuse [No. 36, located in the IPDM E/R]
through IPDM E/R terminal 20
to headlamp RH terminal 3, and
to 15A fuse [No. 45, located in the IPDM E/R]
through IPDM E/R terminal 30
to headlamp LH terminal 3
to 10A fuse [No. 40, located in the IPDM E/R]
through IPDM E/R terminal 27
to headlamp RH terminal 7, and
to 10A fuse [No. 38, located in the IPDM E/R]
through IPDM E/R terminal 28
to headlamp LH terminal 7.

Ground is supplied at all times

to headlamp RH terminals 4 and 8
through grounds E15 and E24
to headlamp LH terminals 4 and 8
through grounds E15 and E24.

With power and ground supplied, the high beam headlamps illuminate.

If voltage is applied to a high beam solenoid, the bulb shade will move and a high beam and a low beam are changed.

The unified meter and A/C amp that received the high beam request signal by BCM across the CAN communication makes a high beam indicator lamp turn on in combination meter.