Exterior Lights System Description - Control/Function (2018 2019 2020)
Headlights Function
The headlights are controlled by the relay control module, based on B-CAN input signals from MICU.
Headlights Auto-OFF Function
When the headlights auto-off function is selected, the exterior lights automatically turn off when the vehicle is in the OFF (LOCK) mode, and the driver's door is opened and closed. The timing for turning off the exterior lights can be customized in the multi-information display (MID) to suit the client's needs.
LED Headlight Fault Detection Function
The LED control unit sends a 10 Hz (duty 50 %) signal to the relay control module when the headlight is on. If the relay control module receives a 5 Hz (duty 50 %) signal, the relay control module judges an LED assembly is faulty. If the relay control module receives anything other than a 5 Hz or 10 Hz signal, the relay control module judges the LED control unit is faulty.
Turn Signal/Hazard Warning Light Function
The turn signal/hazard warning lights are controlled by the MICU, using input signal from the combination light switch or hazard warning switch. When the MICU receives a left turn or right turn command from the combination light switch, it blinks the front and rear turn signal lights for the left or right side of the vehicle. When the MICU receives a hazard warning command from the hazard warning switch, it blinks the front and rear turn signal lights for both sides of the vehicle. The system also includes wire break detection. Wire break detection of the turn signal lights is performed by the feedback signal transmitted by the LED control units and taillights. An abnormal value is registered as a wire break (open) or faulty LED. When this occurs, the MICU increases the turn signal lighting frequency. If the break detection shows that the current value or feedback signal has returned to the correct value, the MICU returns the turn signal lighting frequency to the normal frequency.
One-Push Turn Signal
With the vehicle in the ON mode, if there is a brief input from the turn signal switch, the MICU flashes the left or right turn signal three times in succession.
Daytime Running Lights Function
To control the daytime running lights, the relay control module can provide power to the LED control unit based on inputs from the combination light switch signal and auto light signal. When the combination light switch is in the OFF, AUTO or the PARKING position at the time of power ON mode, and the parking brake switch is turned off, the relay control module transmits an output value to the LED control unit. With the vehicle in the ON mode and the combination light switch in the AUTO position, the relay control module turns on the daytime running lights when the automatic lighting control system does not command the headlights ON. With the vehicle in the ON mode and the combination light switch in other than OFF position, the relay control module will not turn on the daytime running lights.
Automatic Lighting ON/OFF Control
When the light ON delay time elapses after the automatic lighting/rain sensor output voltage drops to the light ON luminance, the front parking lights, the side marker lights, the taillights, the license plate lights, and the headlights turn on. When the light OFF delay time elapses after the automatic lighting/rain sensor output voltage rises to the light OFF luminance, the front parking lights, the side marker lights, the taillights, the license plate lights, and the headlights turn off.
Wiper Linked Mode
When the wiper switch is in a position other than OFF, the automatic lighting/rain sensor counts and records the windshield wiper auto stop signal (edge count) within 20 seconds from the windshield wiper control unit/motor. After a total of 5 counts, it switches to wiper linked mode and turns on the headlights, the side marker lights, and the parking lights. The ON/OFF signals at the time of windshield washer operation are not counted. When an edge count is received for 30 seconds or longer, the count is reduced by 1, and shifting to normal mode is done when the count reaches 0. The windshield wipers return to normal when the vehicle is stopped, or when the respective switch is set to OFF.
Warning Function
The automatic lighting/rain sensor sends an indicator signal to the gauge control module in case of a failure of the automatic lighting sensor or when the signal sent from the MICU and windshield wiper control unit/motor by the B-CAN is abnormal.
Welcome Lights Function
When the vehicle is approached while carrying the remote or the doors are unlocked by keyless operation, the keyless access/TPMS control unit sends an each signal for the door outer handle light to the power window master switch.