312000855 - E1010 POWER SUPPLY SYSTEM - FUNCTIONAL DESCRIPTION

FUNCTIONAL DESCRIPTION

All the electrical systems and circuits are supplied by the battery A001.A terminal block on the battery positive terminal (connectors D and E of A001) is connected to starter motor A020 and engine compartment junction unit B001 (pin 79 of connector A) respectively.    See E5010 STARTING AND RECHARING In the same way, according to the version, the vehicle power circuits are directly connected to the negative battery terminal (connectors A,B and C of A001).    See E1020 EARTHS The main power supply lines are protected by maxifuses in engine compartment junction unit B001 (connector B), in particular:

  • F01: from pin 18, power supply for Body Computer M001 (pin 1 of connector A).
  • F03: from pin 22, power supply for ignition switch H001 -30- (pin 2 of connector A).
  • F04: from pin 19, power supply for braking system control unit M051 (ABS/ESP system power circuit).
    See E7020 ABS     See E7023 ESP

  • F05: from pin 20, power supply for electric steering control unit M086.
    See E7045 ELECTRIC STEERING

  • F81: from pin 24, power supply for glow plug preheating control unit M015.
    See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
Refer to specific diagrams for all other protections.
Other circuits are supplied by turning the ignition key H001 to various positions:

  • in the MAR position numerous circuits and ignition-operated services protected by fuses in Body Computer M001 (INT line) are supplied - from pin 2 of connector B of H001 to pin 11 of connector E of M001 - and from the fuses in engine compartment junction unit B001 (15/54 line) - from pin 1 of connector A of H001 to pin 16 of connector B of B001 -;
  • starter motor A020 (line 50) receives a power supply in the AVV position - from pin 3 of connector A of H001 -.
    See E5010 STARTING AND RECHARING During starting, some circuits are disconnected (INT/A line) - pin 1 of connector B of H001 -.Body Computer M001 receives this power supply at pin 1 of connector E, also providing it to the power relays in control unit B001 via the line protected by fuse F31 (pin 21 of connector C); in particular:

  • T31, for the management of the cigar lighter/power socket system (pin 47 of connector B of B001);
    See E3070 CIGAR LIGHTER / CURRENT SOCKET

  • T08, for the management of the heater/air conditioner (pin 45 of connector B of B001).
    See E6010 HEATER     See E6020 AIR CONDITIONING Body Computer M001 uses this power supply for the management of its own loads via its built-in relays.