169002153 - E7045 ELECTRIC STEERING - OPERATIONAL DESCRIPTION (Smart gearbox)

Operational description

The electric steering control unit M086 receives a power supply directly from the battery, at connector A pin A, through the line protected by fuse F05. It is connected directly to the battery earth A001 connector C from pin B of the same connector.It receives an ignition-operated supply from the line protected by fuse F24 at pin 1 connector B.The electric steering control unit M086 is connected, from pins 2, 3, 7, 8 connector B, via the CAN, to the body computer node M001.     See E1050 CAN CONNECTION LINES.

The following signals are acquired by the electric steering control unit M086:

• vehicle speed: the signal is taken via the C CAN and is used by the control unit to strengthen or provide power assistance for the steering depending on the vheicle speed;
• engine ignition: the signal is supplied by the alternator (signal D+) to confirm that the engine has been started    See E5010 STARTING AND RECHARING;
• engagement of City function: the signal is sent by the special switch housed in the control unit H090 ;

The electric steering control unit M086 controls the switching on of the "system failure" warning light housed in the instrument panel E050, sending the command, via the C CAN, to the body computer node M001; the command is then sent, via the B CAN, from the body computer node to the instrument panel E050.The electric steering control unit is connected, from pin 4 connector B, to the diagnostic socket R010    See E8010 DIAGNOSTIC MULTIPLE CONNECTOR.

Earth C020 is secured to the passenger compartment floor and is positioned near the right front wheel arch (footwell area).