Principles of Operation

Turn Signal and Hazard Lamps


Principles of Operation

NOTE: The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).

The SJB monitors the multifunction switch position by sending voltage reference signals to the multifunction switch. When the multifunction switch is in the LH or RH TURN position, the input signal is routed to an internal ground within the SJB. When the hazard flasher lamp switch is pressed, the input signal is routed to ground.

NOTE: The hazard switch is a momentary contact switch.

When the SJB receives a request for a turn signal or the hazard lamps, the SJB supplies on/off voltage to the appropriate turn lamps.

The rear stoplamps are combined with the turn lamps. The turn and hazard lamp functions override the rear stoplamp function.

The timed on/off cycle is determined by the SJB and is set to flash approximately 80 times per minute if both the front and rear turn lamps operate correctly. If an individual turn signal lamp is inoperative, the SJB flashes the remaining turn lamp approximately 160 times per minute.