Traction Control Relay: Service Precautions

Overvoltage Protection Relay K10:

The ABS overvoltage protection relay K1O is no longer installed as of model year 1989. The voltage for the ABS/ASC control unit in the 7 and 5 Series is then supplied via the DME relay 2 or DDE pole protection relay (542td).

Important! The ABS/ASC control unit installed in conjunction with the overvoltage protection relay must not be Installed in vehicles without an overvoltage protection relay.