System Description: Notes

Control of headlamp system operation is dependent upon the position of the combination switch (lighting switch). When lighting switch is placed in the 2ND position, BCM (body control module) receives input signal requesting the headlamps (and tail lamps) illuminate. This input signal is communicated to IPDM E/R (intelligent power distribution module engine room) across CAN communication lines. The CPU (central processing unit) of IPDM E/R controls headlamp high and headlamp low relay coils. These relays, when energized, direct power to the respective headlamps, which then illuminate.