Automatic Headlamp Leveling
The Automatic Headlamp Leveling Systems consist of the following components:
- Headlamp control module
- Headlamp leveling actuator - left
- Headlamp leveling actuator - right
- Suspension position sensor - front
- Suspension position sensor - rear
| Callout | Component Name |
|---|---|
| DD | Serial Data - GMLAN High Speed |
| DD | Serial Data - GMLAN High Speed |
| DD | Serial Data - GMLAN High Speed |
| DD | Serial Data - GMLAN High Speed |
| DF | Serial Data Chassis Expansion Bus |
| DJ | Serial Data - Local Interconnect Network |
| DJ | Serial Data - Local Interconnect Network |
| K19 | K19 Suspension Control Module |
| K9 | K9 Body Control Module |
| K26 | K26 Headlamp Control Module |
| K17 | K17 Electronic Brake Control Module |
| B99 | B99 Steering Wheel Angle Sensor |
| E13LA | E13LA Headlamp Assembly - Left |
| E13RA | E13RA Headlamp Assembly - Right |
The automatic headlamp leveling system automatically maintains the vertical alignment of the headlamps when the vehicle load and driving conditions change. Each headlamp assembly contains a headlamp leveling motor that is controlled by the headlamp control module. The front and rear suspension position sensors provide the headlamp control module with suspension position information. Each sensor receives a 5 V reference, signal, and low reference circuits from the headlamp control module. The sensors are connected to the control arms of the front and rear suspension. As the vehicle travels, the suspension compresses and rebounds moving the suspension position sensor arms. This causes the signal output of the sensor to change. The headlamp control module compares the information from both suspension position sensors and adjusts the headlamp leveling as needed.