K 1500 Yukon Denali AWD V8-6.0L VIN U (2002)
Turn Signal Lamp: Description and Operation
The HAZ LP 20 A fuse in the engine wiring harness junction block supplies battery positive voltage to the hazard switch assembly. The TURN 20 A
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 10 A fuse and TRL R TRN 10 A fuse in the engine wiring
harness junction block supplies the signal for the trailer turn signal lamps.
