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Fiat MULTIPLA 1.9 JTD 8V fino a 05/99 – ABS – – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

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Fiat MULTIPLA 1.9 JTD 8V fino a 05/99 – ABS – – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION
Wiring diagram
ABS - Wiring diagram Fiat MULTIPLA 1.9 JTD 8V fino a 05/99Unlock Lifetime Access for This Car.

Components
Component codeNameAssembly reference
B1Junction unitB7Fuse (MAXI FUSE) for ABS-
B31ABS fuse-
C10Left front earth-
C10Left front earth-
C12ABS front earth-
C15Facia earth, driver's side-
D1Front/facia junction-
D5Front ABS coupling-
D5Front ABS coupling-
E50Instrument panelH1Ignition switchI030Brake pedal switch ( FRONT )K70Front wheel sensor left for ABSK70Front wheel sensor left for ABSK71Front wheel sensor RH for ABSK71Front wheel sensor RH for ABSK75Left rear wheel sensor for ABSK75Left rear wheel sensor for ABSK76Rear right wheel sensor for ABSK76Rear right wheel sensor for ABSM50ABS control unitR10Multiple tester connection-
Location of components
ABS - Location of components Fiat MULTIPLA 1.9 JTD 8V fino a 05/99Unlock Lifetime Access for This Car.

Components
Component codeNameAssembly reference
B1Junction unitB7Fuse (MAXI FUSE) for ABS-
B31ABS fuse-
C10Left front earth-
C10Left front earth-
C12ABS front earth-
C15Facia earth, driver's side-
D1Front/facia junction-
D5Front ABS coupling-
D5Front ABS coupling-
E50Instrument panelH1Ignition switchI030Brake pedal switch ( FRONT )K70Front wheel sensor left for ABSK70Front wheel sensor left for ABSK71Front wheel sensor RH for ABSK71Front wheel sensor RH for ABSK75Left rear wheel sensor for ABSK75Left rear wheel sensor for ABSK76Rear right wheel sensor for ABSK76Rear right wheel sensor for ABSM50ABS control unitR10Multiple tester connection-
DescriptionThe electronic anti-lock brake system (BOSCH 5.3 ABS) governs braking pressure sent to the wheels and prevents loss of grip under all tyre and road surface conditions. The system is designed to complement the normal mechanical braking system and not to replace it. In this way it ensures effective safety in the case of anomalies: the ABS uses the same fluid as the conventional mechanical braking system.Four sensors fitted to the four wheels inform the electronic control unit of wheel speed at every moment. In this way, they detect wheel lock, wheel slip and loss of grip. Under these conditions, the control unit sends specific instructions to solenoids that modulate hydraulic circuit pressure to eliminate lock and restore the car to within grip limits. This ensures the shortest possible stopping distance, without losing control of the steering.Two adjustment solenoids (one for pressure charging, the other for pressure discharging) are fitted for each wheel.The sensors are active, i.e. they consist of a Hall-effect receiver that faces a magnetic coding device built into the hub bearing. Under these conditions, the signal is less influenced by electromagnetic interference and temperature.The control unit also controls brakeforce distribution over the rear axle and thus replaces the mechanical lload proportioning valve used previously (EBD function: Electronic Brake Distribution).The control unit is equipped with a self-diagnostic function: when an error occurs in the ABS system, a warning light is turned on and the system is simultaneously deactivated. Under these conditions, the car brakes using only the conventional system.When the control unit detects an error in the EBD function, it simultaneously turns on the "insufficient brake fluid level" and "handbrake on" warning light as well as the ABS warning light.Under these conditions, the rear brake distribution control is also deactivated and the car must be driven with great care. For more details 2888263see DESCRIPTION AND OPERATION:3340A(B.S. ANTI-LOCK BRAKING SYSTEM .)The supply lines for the control unit and the various system components (sensors and actuators) are protected by a special maxifuse, located near the control unit, and by a fuse in the engine compartment in the relay and fuse box.
Functional description ABS electronic control unit M50 is supplied (at pin 17 and 18) directly by the battery via a line protected by ABS maxifuse B7. The supply controlled by the ignition (15/54) reaches pin 15 from the line protected by the specific fuse B31. The control unit is earthed via pins 19 and 16. The four sensors K70, K71, K75, K76 send wheel speed signals to pins 6-7, 4-5, 8-9 and 1-2, respectively of M50. The brake pedal switch I30 sends a go ahead signal to pin 14 of the control unit M50: in effect, the operation of the ABS is excluded unless the brake pedal is pressed; this signal arrives from the line controlled by the ignition (INT) protected by fuse F1 of the junction unit (it is the same signal which switches on the lights - See E2021 BRAKE LIGHTS ) If the control unit M50 detects problems relating to the ABS function, it sends the instrument panel E50 a signal, from pin 20, which lights up the "ABS failure" warning light.767the "ABS failure" warning light is a so-called "intelligent" light: thanks to a special operating circuit inside the instrument, it not only comes on to signal a fault in the ABS system, but also if there is no connection or a short circuit to earth in the circuit which connects the instrument with the control unitIf the problems involve the EBD function, the control unit also sends a signal from pin 21 to the "insufficient brake fluid level and handbrake" warning light which comes on together with the "ABS failure" warning light. This is an earth signal and makes the warning light come on because the instrument panel E50 supply is controlled by the ignition (INT) from the line protected by fuse F1 of the junction unit B1. The autodiagnostic data can be read by connecting to connector R10: it receives signals from pin 11 of the control unit M50 via the special diagnostic line.

Junction unit



B001A



B001A



B001C



B001C



B001D



B001E



B001E



B001E



B001F



B001G



B001H



B001H



B001H



B001I



B001I



B001I



B001J



B001J



B001B



B001B



B001B



B001B



B001B



B001B



B001C



B001C



B001C



B001C



B001C



B001C



B001C



B001D



B001D



B001D



B001D



B001D



B001D



B001D



B001E



B001E



B001E



B001G



B001G



B001G



B001H



B001H



B001H



B001H



B001H



B001I



B001I



B001J



B001J



B001B



B001B



B001B



B001C



B001C



B001C



B001D



B001D



B001D



B001H



B001H



B001H



B001I



B001J



Junction unit



B001A



B001A



B001C



B001C



B001D



B001E



B001E



B001E



B001F



B001G



B001H



B001H



B001H



B001I



B001I



B001I



B001J



B001J



B001B



B001B



B001B



B001B



B001B



B001B



B001C



B001C



B001C



B001C



B001C



B001C



B001C



B001D



B001D



B001D



B001D



B001D



B001D



B001D



B001E



B001E



B001E



B001G



B001G



B001G



B001H



B001H



B001H



B001H



B001H



B001I



B001I



B001J



B001J



B001B



B001B



B001B



B001C



B001C



B001C



B001D



B001D



B001D



B001H



B001H



B001H



B001I



B001J



ABS fuse



B031



B031



Left front earth



C010A



C010B



C010C



C010C



C010D



C010D



C010A



C010A



C010A



C010A



C010A



C010A



C010A



C010A



ABS front earth



C012



C012



Facia earth, driver's side



C015A



C015A



C015B



C015B



C015



C015A



C015A



C015B



C015B



C015



Front/facia junction



D001A



D001A



D001A



D001A



D001A



D001A



D001A



D001A



D001A



D001A



D001A



D001A



D001B



D001B



D001B



D001B



D001B



D001B



D001B



D001B



D001B



D001B



D001B



D001C



D001A



D001A



D001A



D001A



D001A



D001A



D001A



D001A



D001C



D001C



D001C



D001C



D001C



D001C



D001C



D001C



D001A



D001C



D001C



Front ABS coupling



D005



D005



D005



D005



D005



Instrument panel



E050A



E050A



E050A



E050A



E050A



E050B



E050B



E050B



E050B



E050B



E050B



E050B



E050C



E050C



E050A



E050B



E050C



E050C



E050A



E050C



Instrument panel



E050A



E050A



E050A



E050A



E050A



E050B



E050B



E050B



E050B



E050B



E050B



E050B



E050C



E050C



E050A



E050B



E050C



E050C



E050A



E050C



Instrument panel



E050A



E050A



E050A



E050A



E050A



E050B



E050B



E050B



E050B



E050B



E050B



E050B



E050C



E050C



E050A



E050B



E050C



E050C



E050A



E050C



Instrument panel



E050A



E050A



E050A



E050A



E050A



E050B



E050B



E050B



E050B



E050B



E050B



E050B



E050C



E050C



E050A



E050B



E050C



E050C



E050A



E050C



Instrument panel



E050A



E050A



E050A



E050A



E050A



E050B



E050B



E050B



E050B



E050B



E050B



E050B



E050C



E050C



E050A



E050B



E050C



E050C



E050A



E050C



Instrument panel



E050A



E050A



E050A



E050A



E050A



E050B



E050B



E050B



E050B



E050B



E050B



E050B



E050C



E050C



E050A



E050B



E050C



E050C



E050A



E050C



Instrument panel



E050A



E050A



E050A



E050A



E050A



E050B



E050B



E050B



E050B



E050B



E050B



E050B



E050C



E050C



E050A



E050B



E050C



E050C



E050A



E050C



Instrument panel



E050A



E050A



E050A



E050A



E050A



E050B



E050B



E050B



E050B



E050B



E050B



E050B



E050C



E050C



E050A



E050B



E050C



E050C



E050A



E050C



Instrument panel



E050A



E050A



E050A



E050A



E050A



E050B



E050B



E050B



E050B



E050B



E050B



E050B



E050C



E050C



E050A



E050B



E050C



E050C



E050A



E050C


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