How to Fix the ABS Warning Light on a Mercedes-Benz?
2 Answers
Turn on the ignition switch. Refer to the ABS wiring diagram for the specific model being repaired. Check the voltage at the pins connected to the battery positive terminal and the ignition switch power supply lines from the ABS ECU wiring harness connector. The value should be equal to the battery voltage; otherwise, it indicates a fault with the fuse or power supply line, which should be repaired accordingly.
The ABS light on a Mercedes-Benz should be taken seriously. As an experienced driver with over a decade behind the wheel, I've encountered this issue several times. First, avoid driving at high speeds immediately—ABS failure on wet or snowy roads can cause brake lock-up. After stopping, check if the wheel speed sensors are dirty or loose, as Mercedes often triggers false alarms due to sensor contamination. The most reliable method is using an OBD diagnostic tool to scan for error codes, pinpointing which wheel has the issue for targeted repairs. However, given the precision of Mercedes' electronic systems, I avoid tampering and instead contact an authorized service center for a thorough inspection. Their professional equipment can detect wiring or ECU faults, enabling timely part replacement or cleaning to prevent driving hazards. Safety is no trivial matter—never risk driving to save trouble.
