The ABS electronic control unit M50 is supplied (at pin 2 and 3) directly by the battery via a line protected by maxifuse F5, housed in the engine compartment junction unit B1.The ignition-operated supply (INT/A) reaches pin 28 from the line protected by the fuse F42 of under facia control unit B2.The control unit is earthed at pins 1 and 4.The four sensors K70, K71, K75, K76 send wheel speed signals to pins 5-26, 10-9, 27-6 and 29-8 of M50 respectively.Brake pedal switch I30 sends an enablement signal to pin 30 of control unit M50: the ABS cannot intervene unless the brake pedal is pressed (signal from N.A. contact); The switch I30 is supplied when the ignition is switched on (INT) from fuse F37 of junction unit B2 .The pedal released signal (signal from N.C. contact) is sent by switch I30 to pin 41 of control unit M50; the N.C. contact of switch I30 is supplied when the ignition is switched on (INT) from fuse F35 of junction unit B2.The yaw and lateral acceleration sensor K74 receives an ignition-operated supply (INT) from the line protected by fuse F42 of the junction unit under the dashboard B2; it receives a reference earth from pin 15 of M50, a reference supply from pin 37 and a test signal from pin 37, whilst the slewing signal is sent to pin 16 and the lateral acceleration signal to pin 20.The longitudinal acceleration sensor K13 receives a reference erath from pin 21 of M50, a reference supply from pin 19 and sends the longitudinal acceleration signal to pin 17.Pin 33 di M50 emits a discrete speed signal that is sent tol Body Computer M1; the same signal is also copied via the CAN network.Pins 14 and 35 of ABS control unit M50 connect to engine control unit M10, Body Computer M1 and and instrument panel E50 to control the ABS warning light and - if the problem lies in the EBD function - the low brake fluid level and handbrake warning lights.The ESP and ASR functions manage the ESP warning light as described previously. The same applies for the HH warning light.The ''ASR OFF'' control button on panel H35 sends a deactivation signal to pin 31 of M50, while pin 46 relays a signal that turns on an LED in panel H35 when the system is off; The switch H35 is supplied when the ignition is switched on (INT) from fuse F49 of junction unit B2 .Self-diagnostic data can be read by connecting to connector C of Body Computer M1 - pin 1: it receives signals from pin 11 of control unit M50 via a special diagnostic line .