Turn Signal Lamp: Description and Operation

TURN SIGNAL LAMPS

The TSIG/HAZ fuse in the rear fuse block supplies battery positive voltage to the turn signal/hazard flasher module. The turn signal/hazard flasher module has ground at G201. The turn signal lamps may only be activated with the ignition switch in the ON or START position. The IGN-1 fuse in the rear fuse block supplies battery positive voltage to the turn signal switch. When the turn signal switch is placed in either the left or right position, current flows from the turn signal switch assembly to the turn signal/hazard flasher module. The turn signal/hazard flasher module then sends an on-off voltage signal to either the left or right turn signals and their instrument cluster (IPC) indicator. When the hazard switch is pressed, the switch contacts are closed and the turn signal/hazard flasher module hazard input is grounded. In response to this input, the turn signal/hazard flasher module supplies battery positive voltage in an on and off flashing pattern to all the turn signal lamps. This also activates both turn signal indicators. When a THEFT is occurring, the Dash Integration Module (DIM) grounds the turn signal/hazard flasher module hazard input. The left turn signals have ground at G401 and at G402. The right turn signals have ground at G401.

The flash rate of the turn signal lamps is 90 flashes per minute. Each tail lamp assembly monitors the current among the LEDs. When 20 % or more of the tail lamp LEDs fail, that tail lamp removes ground from the outage detection signal circuit. The turn signal/hazard flasher module will then increase the flash rate of the remaining turn signal lamps and the respective indicator to 180 flashes per minute.