Turn Signal Lamps

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The HAZ LP 20A fuse in the engine wiring harness junction block supplies battery positive voltage to the hazard switch assembly. The TURN 20A fuse in the engine wiring harness junction block supplies ignition positive voltage to the turn signal switch assembly. With the ignition switch in the RUN or START position, ignition positive voltage is connected through the turn signal and hazard switch assembly to the flasher module which is grounded at G203. When the turn signal switch is placed in either the left or right position, the circuit is complete from the flasher module through the turn signal switch to the turn signal lamps and to ground. The flasher module then sends an on-off voltage signal through the turn signal switch to either the left or right turn signals and their instrument panel cluster (IPC) indicator. The audio chime is also activated when the turn signals are on. When the hazard switch is pressed, all turn signal lamps will flash including both IPC turn indicators. The front turn signals are grounded at G100. The rear turn signals are grounded at G401.

For trailer wiring, separate turn signal circuits are connected through the turn signal switch for the trailer wiring harness. The TRL L TRN 10A fuse and TRL R TRN 10A fuse in the engine wiring harness junction block supplies the signal for the trailer turn signal lamps.