Turn Signal Lamp: Description and Operation

TURN SIGNAL LAMPS

The HAZ LP fuse in the underhood fuse block supplies battery positive voltage to the multifunction hazard switch assembly. The TURN fuse in the IP fuse block supplies Ignition positive voltage to the multifunction turn signal switch assembly. With the ignition switch in the RUN or START position, ignition positive voltage is connected through the multifunction turn signal and hazard switch assembly to the flasher module which is grounded at G205. When the turn signal switch is placed in either the left or right position, the circuit is complete from the flasher module to the turn signal lamps and to ground. The flasher module then sends an on-off voltage signal to either the left or right turn signals and their Instrument Panel Cluster (IPC) indicator. When the hazard switch is activated, all turn signal lamps will flash including both IPC turn indicators. The front turn signals are grounded at G111 and G112. The rear turn signals are grounded at G475 and G422 on the pickup and G450 on the utility.

On the export vehicle, the rear turn signal lamps are separate amber lamps utilizing single filament bulbs grounded at G450. There are also amber side repeater lamps on each fender which are grounded at G111 and G112. The front side marker lamps stay on steady and do not flash alternately with the turn signals as the domestic vehicle does due to they are grounded directly to G111 and G112.