ELECTRIC STEERING - Functional description

Functional description

The electric power steering control unit M86 monitors and controls the entire electric driving system electrically.

The control unit is supplied directly by the battery via a line protected by fuse F2 of the engine compartment junction unit B1 at pin A of connector A of M86. Pin B of connector A of M86 is earthed.

The supply controlled by the ignition (15/54) reaches pin 1 of connector B of M86 from the line protected by fuse F24 of the engine compartment junction unit B1.

Control unit M86 is connected to the CAN pins 5 and 6 of connector B with the other nodes, particularly the Body Computer M1 and the instrument panel E50 to which it sends the signals for the electric steering failure warning light.

The CITY mode (less effort to turn the wheel) selection button is located in tunnel switch unit H35; the engagement earth signal for the function reaches the control unit M86 via the CAN through the Body Computer M1, pin 19 of connector D.

The information that the CITY function is on is also sent to the instrument panel E50 which lights up the CITY warning light.

The self-test data can be read by connecting to connector C of the Body Computer M1 pin 9: it receives the signals from pin 4 of connector B of M86 via the specific tester line: pin 11 of connector H: M1 See E8010 DIAGNOSTIC MULTIPLE CONNECTOR.