Honda Pilot: Headlight Leveling System Description - Components

Suspension Stroke Sensor

The headlight leveling system uses the front and rear suspension stroke sensor signals. The front suspension stroke sensor is located at the left front suspension area. A short link connects the arm of the sensor to the lower arm.

The rear suspension stroke sensor is located at the rear floor panel area. A short link connects the arm of the sensor to the lower arm.

The sensors detect the vehicle ride height and sends a voltage signal to the headlight leveling control unit.

Headlight Leveling Motors

The headlight leveling motors are located behind both headlights, and they adjust the headlights vertically based upon the voltage signals they receive from the headlight leveling control unit.

Headlight Leveling System Description - Control/Function

Basic Control/Function

With the vehicle in ON mode and headlights ON, the headlight leveling control unit calculates the output voltage to the leveling motor based on the input values of the current vehicle angle, the vehicle angle average value* and the vehicle speed signal. It then activates the leveling motor when the corresponding control conditions are met.

NOTICE

* The vehicle angle average value means: The average value over 1 second for the vehicle angle detected 0.6 seconds earlier by the headlight leveling sensor, detected ten times in intervals of 0.1 seconds.

Control at the Time of Start

Leveling control output is made when all of the following conditions are satisfied.

• The vehicle is in the ON mode.
• 1.6 seconds or more have passed since input of the ignition ON signal.
• The headlights are set to ON.
• The vehicle angle average value has changed by 2º or more to the upper/lower side from the current leveling control angle.

Control While Stopped

Leveling control output is made when all of the following conditions are satisfied.

• The vehicle is in the ON mode.
• The headlights are set to ON.
• 1.6 seconds or more have passed since the vehicle has stopped.
• The vehicle angle average value has changed by 0.2 º or more to the upper/lower side from the current leveling control angle.

Control While Running

Leveling control output is made when all of the following conditions remain satisfied uninterrupted for 25 seconds, and the headlight leveling control unit has registered that the vehicle angle is stable; it then performs a leveling control output.

• The vehicle is in the ON mode.
• The headlights are set to ON.
• The change of the vehicle angle is 0.3 º or less for 25 seconds.
• The vehicle speed change is 2 mph (3 km/h) or less for 25 seconds.
• The vehicle angle average value has changed by 0.2 º or more to the upper/lower side in relation to the current leveling control angle.
• The vehicle speed is within the range from 13 to 155 mph (21 to 249 km/h).

Headlight Leveling System Description - Overview

The headlight leveling system is the function that is to optimize the light axis of the headlights without being affected by the tilt caused by the weight of the vehicle.

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