Mercedes in their infinite wisdom have dualed the wiring to the CLS and the WWLS.....if the WWLS fails or the CLS, I change both with OE sensors.
The monitor senses potential between sensors and turns relevant light on....well that's what is supposed to happen
However, when a fault in one mimics a fault in the other, the wrong lamp illuminates.
So far had three MB's do this and cured with both sensors replaced.
