Turn Signal Switch: Description and Operation

Fig.17 Multi-function Switch:

MULTI-FUNCTION SWITCH
The turn signals are part of the multi-function switch, which contains:
- Electrical circuitry for turn signals.
- Hazard warning switch.
- Headlamp switch.
- Fog Lamp Switch.
- Headlamp beam select switch.
- Optical Horn.
- Instrument Panel Lamp Dimmer/Interior Lamp Switch.
- Combination Flasher.

Hazard Warning System
The hazard warning system is actuated by a push button located in the multi-function switch on the top of the steering column between the steering wheel and the instrument panel. The hazard switch is identified with a double triangle on front of the button.

The hazard warning system allows the vehicle operator to provide the drivers of other vehicles in near proximity an optical indication that the vehicle is disabled or is an obstacle to traffic flow. Unlike the turn signal system, the hazard warning system has battery current at all times, regardless of ignition switch position.

When the hazard warning system is activated, the combination flasher will cause both the right and left side turn signal indicator lamps, front park/turn signal lamps, front side marker lamps and rear turn signal lamps to flash ON and OFF. If the exterior lamps are turned OFF; the front park/turn signal lamps and the front side marker lamps will flash in unison. If the exterior lamps are turned ON, the front park/turn signal lamps and the side marker lamps will flash alternately.

Multi-function Switch
The integrated switch assembly is mounted to the left hand side of the steering column. When the driver wishes to signal his intentions to change direction of travel, he moves the lever upward to cause the right signals to flash and downward to cause the left signals to flash. After completion of a turn the system is deactivated automatically. As the steering wheel returns to the straight ahead position, a canceling cam molded to the clockspring mechanism comes in contact with the cancel actuator on the turn signal multi-function switch assembly. The cam lobe, pushing on the cancel actuator, returns the switch to the OFF position.

If only momentary signaling such as indication of a lane change is desired, the switch is actuated to a left or right intermediate detent position. In this position the signal lamps flash as described above, but the switch returns to the OFF position as soon as the lever is released.

When the system is activated, one of two indicator lamps mounted in the instrument cluster flashes in unison with the turn signal lamps, indicating to the driver that the system is operating.