THEORY OF OPERATION
The Front and Rear Headlamp Level Sensors monitor changes in the relative distance between the vehicle body and the front or rear suspension members. In vehicles with High Intensity Discharge (HID) Headlamps but without the air suspension system, the sensor circuitry is energized by the Automatic Headlamp Leveling Module (AHLM) and both sensors provide hard wired inputs back to the AHLM. The AHLM uses these sensor inputs as logic for calculating when and how much to adjust the headlamp beams as part of the Automatic Headlamp Leveling feature.
The Front and Rear Headlamp Level Sensors monitor changes in the relative distance between the vehicle body and the front or rear suspension members. In vehicles with High Intensity Discharge (HID) Headlamps but without the air suspension system, the sensor circuitry is energized by the Automatic Headlamp Leveling Module (AHLM) and both sensors provide hard wired inputs back to the AHLM. The AHLM uses these sensor inputs as logic for calculating when and how much to adjust the headlamp beams as part of the Automatic Headlamp Leveling feature.
The Front and Rear Headlamp Level Sensors monitor changes in the relative distance between the vehicle body and the front or rear suspension members. In vehicles with High Intensity Discharge (HID) Headlamps but without the air suspension system, the sensor circuitry is energized by the Automatic Headlamp Leveling Module (AHLM) and both sensors provide hard wired inputs back to the AHLM. The AHLM uses these sensor inputs as logic for calculating when and how much to adjust the headlamp beams as part of the Automatic Headlamp Leveling feature.
The Front and Rear Headlamp Level Sensors monitor changes in the relative distance between the vehicle body and the front or rear suspension members. In vehicles with High Intensity Discharge (HID) Headlamps but without the air suspension system, the sensor circuitry is energized by the Automatic Headlamp Leveling Module (AHLM) and both sensors provide hard wired inputs back to the AHLM. The AHLM uses these sensor inputs as logic for calculating when and how much to adjust the headlamp beams as part of the Automatic Headlamp Leveling feature.
The Left and Right Headlamp Leveling Control Modules (Headlamp Leveling Motors) are used to control the levels of the Front Headlamps. The Automatic Headlamp Leveling Module (AHLM) communicates with these Control Modules via a LIN Lighting circuit. (D503) for the Left, and (D504) for the Right. The Headlamp Leveling Motors are integrated into both the Left and Right Headlamp Assemblies. If a motor is defective, the entire assembly must be replaced.
The Left and Right Headlamp Leveling Control Modules (Headlamp Leveling Motors) are used to control the levels of the Front Headlamps. The Automatic Headlamp Leveling Module (AHLM) communicates with these Control Modules via a LIN Lighting circuit. (D504) for the Left, and (D504) for the Right. The Headlamp Leveling Motors are integrated into both the Left and Right Headlamp Assemblies. If a motor is defective, the entire assembly must be replaced.
See also:
• STANDARD PROCEDURE
• DIAGNOSTIC CODE INDEX