BMW Test Headlights, Turn Signals & Brake Lights | Troubleshooting on 2017 7-Series YOUCANIC Scanner

About this video

In this video, we demonstrate how to test the headlights, turn signals, and brake lights on a 2017 BMW 740 7-Series using the YOUCANIC Full System Scanner. Proper functioning of your vehicle’s lights is essential for safety and compliance with road regulations.

Why is it needed?
Testing and troubleshooting your vehicle’s lighting system ensures that all lights function correctly, providing visibility and signaling intentions to other drivers. Faulty lights can lead to safety hazards, traffic citations, and potential accidents. Using a diagnostic scanner allows for precise identification of issues, ensuring they are resolved efficiently.

Common messages and fault codes related to lighting issues:

“Check Control Messages”: Alerts indicating specific lighting faults.
DTC 9CBC: Right turn signal malfunction.
DTC 9CBD: Left turn signal malfunction.
DTC 9CC0: Brake light malfunction.
DTC 9CC1: Headlight malfunction.
Technical Terms and Process:

Headlight: The front lights of the vehicle used for driving in low-light conditions.
Turn Signal: Lights that indicate the direction the vehicle is turning.
Brake Light: Rear lights that illuminate when the brake pedal is pressed, signaling to other drivers that the vehicle is slowing down or stopping.
Light Control Module (LCM): The module responsible for controlling the vehicle’s exterior lights.
Diagnostic Trouble Codes (DTCs): Codes that indicate specific faults within the vehicle’s systems.
Troubleshooting Steps:

Inspect Bulbs: Check all bulbs for proper operation and replace any that are burnt out.
Check Fuses: Inspect and replace any blown fuses related to the lighting system.
Test with YOUCANIC Scanner: Use the scanner to activate each light individually and identify any faults.
Read & Clear DTCs: Use the scanner to read diagnostic trouble codes and clear them after resolving the issues.
Using the YOUCANIC Full System Scanner, we provide a detailed, step-by-step guide for testing and troubleshooting the headlights, turn signals, and brake lights on your BMW 740 7-Series. This tutorial is ideal for both DIY car enthusiasts and professional mechanics, ensuring your vehicle’s lighting system is fully operational and safe. Learn how to maintain and troubleshoot your BMW’s lights with our comprehensive guide.