May 3, 2017
Mercedes W211 E Class W219 CLS Alarm Siren Replacement
A common (ish) fault on these cars is the alarm siren backup battery leaking or suffering corrosion over time and damaging the unit. Symptoms include random, fast flashing of indicator lights when the car is locked or the alarm siren randomly going off or making strange noises. The fix is to replace the alarm siren. Mercedes actually updated the part...
