Headlamps on Low Beam
CIRCUIT OPERATIONWhen the operator turns the headlamp switch to the ON position a ground path is completed on circuit L307 from the Body Control Module (BCM), through the headlamp switch to ground on circuit Z1.
Voltage for the L307 circuit is supplied from the BCM.
The BCM interprets the operators request and supplies a ground path for circuits L93.
Circuit L93 connects from the BCM to the beam select switch in the multi-function switch. With the beam select switch in the LOW position the ground path is supplied through the CLOSED contacts in the switch to circuit L94.
Circuit L94 connects from the switch to the coil side of the LOW beam relay, located in the Power Distribution Center (PDC).
The ground path on the coil side of the relay causes the contacts in the relay to CLOSE connecting a direct battery feed to fuse 22 and 23 in the PDC.
Circuit L43 connects from fuse 23, a 15 Amp, to the LOW beam side of the left headlamp. Ground for the lamp is supplied on circuit Z1 and terminates at the left cowl panel.
Circuit L44 connects from fuse 22, a 15 Amp, to the LOW beam side of the right headlamp. Ground for the lamp is supplied on circuit Z1 and terminates at the right cowl panel.