ABS - Functional description

Functional description

The ABS electronic control unit M50 is supplied (at pin 2 and 6) directly by the battery via a line protected by maxifuse F1, housed in the engine compartment junction unit B1.

The ignition-operated supply (INT/A) reaches pin 23 from the line protected by the fuse F42 of under facia control unit B2.

The control unit is earthed via pins 1 and 5.

The four sensors K70, K71, K75, K76 send wheel speed signals to pins 28-12, 15-16, 13-14 and 30-31 of M50 respectively.

Brake pedal switch I30 sends an enablement signal to pin 14 of control unit M50: the ABS cannot intervene unless the brake pedal is pressed. The switch I30 is supplied when the ignition is switched on (INT) from fuse F37 of junction unit B2.

Pin 37 of M50 emits a discrete speed signal for transmission to Body Computer M1; the same signal is also copied to the CAN network.

Pins 24 and 40 of ABS control unit M50 connect to engine control unit M10, Body Computer M1 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.

Self-diagnostic data can be read by connecting to connector C of Body Computer M1- pin 1: it receives signals from pin 11 of the control unit M50 via the special diagnostic line.See E8010 DIAGNOSTIC MULTIPLE CONNECTOR

07/03 to 12/03, from 01/04

Functional description

The ABS electronic control unit M50 is supplied (at pin 2 and 3) directly by the battery via a line protected by maxifuse F1, housed in the engine compartment junction unit B1.

The ignition-operated supply (INT/A) reaches pin 18 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 16-5, 9-10, 6-17 and 8-19 of M50 respectively.

Brake pedal switch I30 sends an enablement signal to pin 20 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.

Pin 23 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 15 and 26 of ABS control unit M50 connect to engine control unit M10, Body Computer M1 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.

Self-diagnostic data can be read by connecting to connector C of Body Computer M1 - pin 1: it receives signals from pin 11 of the control unit M50 via the special diagnostic line. See E8010 DIAGNOSTIC MULTIPLE CONNECTOR