1. Cruise Control Switch: Check if the cruise control switch on the steering wheel is turned on. Ensure it is in the "ON" position.
2. Brake Light Switch: The brake light switch may be faulty or out of adjustment, causing the cruise control to disengage when the brake is applied. Check the switch and make sure it is functioning properly.
3. Speed Sensor: The speed sensor, which is usually located on the transmission or differential, may be malfunctioning. This sensor provides the speed input to the cruise control system. Check the sensor and its wiring for any damage or issues.
4. Cruise Control Module: The cruise control module, which is responsible for controlling the cruise control system, may be faulty. This module is often located under the dashboard or in the engine compartment. Check for any loose connections or damage to the module.
5. Wiring Issues: Check the wiring harness related to the cruise control system for any loose connections, breaks, or damage. Ensure that all electrical connections are secure and free from corrosion.
If you are unable to identify and fix the issue yourself, it is recommended to seek assistance from a qualified mechanic or an authorized Mercedes-Benz service center. They can diagnose the exact cause of the problem and perform the necessary repairs or replacements.
