Exterior Lighting

Following are descriptions of how the left multi-function switch is operated to control the many exterior lighting functions and features it provides:

• Front Fog Lamps  - The optional front fog lamps are requested when the left multi-function switch control knob is pulled outward to the front fog lamps detent position. The left multi-function switch sends an electronic switch status message over the LIN bus to the CCN, then over the CAN data bus to the other electronic modules in the vehicle. The switch control knob incorporates an internal cam mechanism that will only allow the front fog lamps to be selected while the headlamp On position is also selected, and will automatically move the control knob to the front fog lamps Off position when the control knob is rotated to deselect the headlamps.
• Headlamps  - The headlamps are requested when the left multi-function switch control knob is rotated to the headlamps on detent position. The left multi-function switch sends an electronic switch status message over the LIN bus to the CCN, then over the CAN data bus to the other electronic modules in the vehicle.
• Headlamp Beam Selection  - The headlamp beams are selected when the left multi-function switch control stalk is pushed forward. The left multi-function switch sends an electronic switch status message over the LIN bus to the CCN, then over the CAN data bus to the other electronic modules in the vehicle. Each time the control stalk is actuated in this manner, the headlamp beams are toggled from the current selection to the opposite selection.
• Headlamp Optical Horn  - The headlamp optical horn is selected each time the left multi-function switch control stalk is pulled rearward to a momentary position just short of the beam selection detent position. The headlamp high beams will remain illuminated for as long as the control stalk is held in this momentary position and the previously selected beams will be restored when the control stalk is released. The left multi-function switch sends an electronic switch status message over the LIN bus to the CCN, then over the CAN data bus to the other electronic modules in the vehicle.
• Park Lamps  - The headlamps are requested when the left multi-function switch control knob is rotated to the park lamps on detent position. The left multi-function switch sends an electronic switch status message over the LIN bus to the CCN, then over the CAN data bus to the other electronic modules in the vehicle.
• Rear Fog Lamps  - The optional rear fog lamps are requested when the left multi-function switch control knob is pulled outward to the front fog lamps detent position and then rotated to the rear fog lamps detent position. The left multi-function switch sends an electronic switch status message over the LIN bus to the CCN, then over the CAN data bus to the other electronic modules in the vehicle. The switch control knob incorporates an internal cam mechanism that will only allow the rear fog lamps to be selected while the front fog lamps On position is also selected, and will automatically move the control knob to the rear fog lamp Off position when the control knob is pushed in to deselect the front fog lamps.
• Turn Signal Control  - The turn signals are requested when the left multi-function switch control stalk is moved downward (left signal) or upward (right signal). The control stalk has a detent position in each direction that provides turn signals with automatic cancellation, and an intermediate, momentary "lane change" position in each direction that provides turn signals only until the control stalk is released. When the control stalk is moved to a detent turn signal switch position, a cancel actuator extends toward the center of the steering column. A turn signal cancel cam that is integral to the clockspring, rotates with the steering wheel and the cam lobes contact the cancel actuator when it is extended from the left multi-function switch. When the steering wheel is rotated during a turning maneuver, one of the two turn signal cancel cam lobes will contact the turn signal cancel actuator. The cancel actuator latches against the cancel cam rotation in the direction opposite that which is signaled. If the left turn signal detent is selected, the lobes of the cancel cam will ratchet past the cancel actuator when the steering wheel is rotated to the left, but will unlatch the cancel actuator as the steering wheel rotates to the right and returns to center, which will cancel the turn signal event and release the control stalk from the detent so it returns to the neutral Off position. The left multi-function switch sends an electronic switch status message over the LIN bus to the CCN, then over the CAN data bus to the other electronic modules in the vehicle.