Exterior Lights System Description
Headlights Function
The headlights are controlled by the body control module based on the combination light switch input signals. In low beam control, the low beam signal is sent from the body control module via B-CAN to the relay control module, and is output from the relay control module. Also, in high beam control, the signal is output from the body control module.
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 to suit the client needs.
Headlight Fault Detection Function
If the relay control module receives the 5 Hz (duty 50 %) signal, the relay control module judges an LED assembly is faulty, it sends a Lights-ON indicator signal to the gauge control module via the B-CAN. If the relay control module receives other than 5 Hz or 10 Hz signal, the relay control module judges that the headlight circuit is faulty.
Turn Signal/Hazard Warning Light Function
The turn signal/hazard warning lights are controlled by the body control module, using input signal from the combination light switch or hazard warning switch. When the body control module 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 body control module 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 by monitoring the current values using the body control module. An abnormal value is registered as a wire break (open) or faulty LED. When this occurs, the body control module increases the turn signal lighting frequency. If the break detection shows that the current value has returned to the correct value, the body control module returns to the normal frequency.
One-Push Turn Signal Light
With the vehicle in the ON mode, when there is a brief input from the turn signal switch, the body control module flashes the left or right turn signal three times in succession.
Fog Light Function
The fog light is controlled by the relay control module, based on the combination switch signal and the automatic lighting signal.
Daytime Running Lights Function
For daytime running light control, the relay control module controls the daytime running light based on the combination light switch signal, parking brake signal, and automatic lighting signal, then turns on the light. When the combination light switch is in the AUTO position with the vehicle in the ON mode and the parking brake released, the relay control module controls the daytime running lights. When the combination light switch is in the ON position or the AUTO position, and the low beam output signal from the automatic lighting control unit-sensor or the automatic lighting/rain sensor are inputted to the relay control module, daytime running light control is not performed. Once the parking brake is released, the relay control module commands the daytime running lights ON.
Automatic Lighting ON/OFF Control
When the light ON delay time elapses after the automatic lighting control unit-sensor or the automatic lighting/rain sensor output voltage drops to the light ON luminance, the front parking lights, side marker lights, taillights, inner taillights, license plate light, and headlights turn on. When the light OFF delay time elapses after the automatic lighting control unit-sensor or automatic lighting/rain sensor output voltage rises to the light OFF luminance, the front parking lights, side marker lights, taillights, inner taillights, license plate light, and headlights turn off.
Without Automatic Wiper
With Automatic Wiper
Wiper Linked Mode
When the wiper switch is in a position other than OFF, the automatic lighting control unit-sensor or automatic lighting/rain sensor counts and records the windshield wiper motor auto stop (AS) signal (ON to OFF edge count within 20 seconds) from the body control module via B-CAN. After a total of 5 counts, it switches to wiper linked mode and turns on the headlights, front parking lights, taillights, inner taillights, and side marker lights. The ON/OFF signals at the time of windshield washer operation are not counted. When a count is not received for 30 seconds or more, the count is reduced by 1, and shifting to normal mode is done when the count reaches 0. The wipers return to normal when the vehicle is stopped, or when the respective switch is set to OFF.
Warning Function
Without Automatic Wiper
The automatic lighting control unit-sensor sends a warning indicator signal to the gauge control module in case of a failure of the automatic lighting sensor, or when the signal sent from the body control module by B-CAN signal is abnormal.
With Automatic Wiper
In case an automatic lighting/rain sensor abnormality occurs, the body control module receives a warning signal from the automatic lighting/rain sensor via the LIN, then the body control module sends a warning indicator signal to the gauge control module via the B-CAN.
Failsafe Function
When an automatic lighting sensor failure occurs, the system maintains the state before the automatic lighting sensor failure, and a warning is displayed in the gauge control module.