939011735 - E5010 STARTING AND RECHARGING - FUNCTIONAL DESCRIPTION

FUNCTIONAL DESCRIPTION

The START/STOP button H2 receives a power supply - pins 3 and 5 - from the steering lock control unit M89, which "relays" the direct power supply coming - at pin C1 of M89 - from the line protected by fuse F3 of the engine compartment junction unit B1.The lighting for the button is guaranteed by the ignition-controlled line (INT) protected by fuse F49 of the junction unit under the dashboard B2.When the button is pressed, "AVV" signals are sent from pins 4 and 6 of H2 to M89 - pins B6 and B7; tha latter supplies the electromagnet winding - from pin B8 - pin 50 of the starter motor A20 - connector B.

The supply and control signals for button H2 are "redundant" (two identical duplicate signals) for safety reasons, the wish of the user is recognized by means of the presence of only one of the two signals.

The steering lock control unit M89 provides this power supply after a series of controls and checks.    See E7065 ELECTRIC STEERING LOCKIn particular, the TEG inserted status is sent by the TEG Reader H3 via the CAN - pins 3 and 8.The same signal is sent in a redundant manner to the steering lock node M89, form pin 2, and the latter, in turn, forwards it via the CAN.The starting go ahead only takes place if the clutch or the brake pedal is pressed: the control unit M89 receives the signal coming from the clutch switch I31 at pin A5 and the two brake pedal signals I30; the N.A. contact (pedal pressed) at pin C4 of M89 and the N.C. contact (pedal released) at pin C7 of M89.On versions with automatic transmission, when the gearbox is not in Park or Neutral, the starting of the vehicle is inhibited: a signal is sent from pin 5 of connector A of the automatic transmission control unit M55 to pin B4 of the steering lock control unit M89.Pin 30 of A20 - connector A - i.e. the actual motor, receives a power supply with the voltage coming directly from the battery A1.The continuous current produced by the alternator A10 (pin B+) - connector B - is sent to the battery A1, passing through the motor A20.These two lines are always supplied and not protected by fuses; they are however controlled by the automatic "battery disconnection" device located in the fuse box on the battery B99: if the inertia switch I50 intervenes, a signal is sent to connector F of B99 which "opens" the device, thereby removing the power supply from the motor A20 and the alternator A10.When the alternator does not turn and therefore does not recharge the battery, an earth signal is sent from pin D+ - connector A - of A10 to the Body Computer M1 - pin 19 of connector A: this is connected via the CAN line to the instrument panel E50 and manages the switching on of the recharging warning light in the instrument panel as described above.