Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Principles of Operation
The Headlamp Control Module (HCM) receives information from the communication network such as vehicle speed, steering wheel angle and headlamps on status. Based on the information received, the HCM determines if the headlamps need to be angled left or right as well as the degree of angle.
The HCM does not operate the adaptive headlamps until the vehicle speed is above 5 km/h (3 mph).
When the ignition is placed in the RUN/START position, the HCM runs an initialization check to determine the straight-ahead position of the headlamps. If the HCM does not receive the required information over the communication network or determines that there is a fault with the circuitry to the sensors or control motors, it defaults the headlamps to the straight-ahead position and sets DTC(s).
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.