Alfa Romeo 159 3.2 JTS Fino a 12/05 – ABS – – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

WIRING DIAGRAM - ABS - Alfa Romeo 159 3.2 JTS Fino a 12/05

ABS - WIRING DIAGRAM Alfa Romeo 159 3.2 JTS Fino a 12/05

COMPONENTS - ABS - Alfa Romeo 159 3.2 JTS Fino a 12/05

Component code	Description	Reference to the operation
B001	JUNCTION UNIT
B002	JUNCTION UNIT UNDER DASHBOARD
B099	MAXIFUSE BOX ON BATTERY
C012	ABS FRONT EARTH	-
C020	PASSENGER SIDE DASHBOARD EARTH	-
E050	INSTRUMENT PANEL
I030	BRAKE PEDAL SWITCH
K070	LEFT FRONT WHEEL SENSOR FOR ABS
K071	RIGHT FRONT WHEEL SENSOR FOR ABS
K075	LEFT REAR WHEEL SENSOR FOR ABS
K076	RIGHT REAR WHEEL SENSOR FOR ABS.
M001	BODY COMPUTER
M050	ABS CONTROL UNIT
M089	STEERING LOCK CONTROL UNIT (NBS)

COMPONENT LOCATION - ABS - Alfa Romeo 159 3.2 JTS Fino a 12/05

ABS - COMPONENT LOCATION Alfa Romeo 159 3.2 JTS Fino a 12/05

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Component code	Description	Reference to the operation
B001	JUNCTION UNIT
B002	JUNCTION UNIT UNDER DASHBOARD
B099	MAXIFUSE BOX ON BATTERY
C012	ABS FRONT EARTH	-
C020	PASSENGER SIDE DASHBOARD EARTH	-
E050	INSTRUMENT PANEL
I030	BRAKE PEDAL SWITCH
K070	LEFT FRONT WHEEL SENSOR FOR ABS
K071	RIGHT FRONT WHEEL SENSOR FOR ABS
K075	LEFT REAR WHEEL SENSOR FOR ABS
K076	RIGHT REAR WHEEL SENSOR FOR ABS.
M001	BODY COMPUTER
M050	ABS CONTROL UNIT
M089	STEERING LOCK CONTROL UNIT (NBS)

DESCRIPTION - ABS - Alfa Romeo 159 3.2 JTS Fino a 12/05

The ABS electronic anti-lock braking system regulates the braking pressure transmitted to the wheels, preventing them from losing grip whatever the tyre and road conditions.The system is designed to be incorporated with the braking system (using the same hydraulic fluid) without preventing the operation of the actual braking system if the ABS fails.Four sensors, located on each of the four wheels, indicatae the speed of each wheel to the electronic control unit, recording any situations involving locking, slipping or loss of grip.In these situations, the control unit controls the solenoid valves which modulate the pressure in the hydraulic circuit, preventing the wheels from locking and restoring grip conditions for the vehicle which ensures optimum handling of the vehicle and excellent stopping distances.The sensors are the "active" type, supplied by the control unit; they consist of a magnetic resistive receiver with a magnetic codifier incorporated in the hub bearing so that the signal is less affected by electromagnetic interference and variations in temperature.The ABS control unit also controls the distribution of the braking load between the front and rear axles meaning that the mechanical load proportioning valve used previously can be dispensed with (EBD function: Electronic Brake Distribution ).The control unit is equipped with an autodiagnostic function: when an error in the ABS function is detected, the warning light comes on and, at the same time, the system is deactivated; in these conditions the vehicle brakes using the traditional system only.When the control unit detects an error which also affects the EBD function, it turns on the "ABS failure" warning light and the "low brake fluid and handbrake" warning light.768In these conditions the rear braking distribution control is deactivated: the driver must therefore proceed very carefully to the first authorised service centre.For more detailsSee descriptions 3340 ANTI-LOCK BRAKING SYSTEM (ABS)The ABS control unit calculates the speed of the vehicle starting from the figures that are supplied by the drive wheel sensors (with the ABS control unit calculating the average value) and from the actual circumference of the wheels themselves, supplied by the Body Computer: this speedometer signal is then sent, via the CAN, to the nodes that require this information. The ABS control unit also produces a discreet signal which replicates the vehicle speed information calculated and transmitted via the CAN.The control unit power supply lines are protected by two special fuses located in the engine compartment junction unit; the ignition-operated supply is protected by a specific fuse in the junction unit under the dashboard.

FUNCTIONAL DESCRIPTION - ABS - Alfa Romeo 159 3.2 JTS Fino a 12/05

The ABS electronic control unit receives a power supply (at pins 12 and 25) directly from the battery from the line protected by fuses F5 and F4 of the engine compartment junction unit B1.The ignition-controlled power supply (INT) arrives at pin 23 from the line protected by fuse F42 of the junction unit under the dashboard B2.The control unit is earthed at pins 11 and 24.The four sensors K70, K71, K75, K76 send wheel speed signals respectively to pins 19-20, 7-8, 21-22, 9-10 of control unit M50.The brake pedal switch I30 sends an enablement signal to pin 17 of the control unit M50: all intervention of the ABS is excluded unless the brake pedal is pressed (signal from N.A. contact); switch I30 receives an ignition-controlled power supply (INT) from fuse F37 of junction unit B2.The "discreet" speedometer signal sent by the Body Computer M1 leaves from pin 16 of M50; the same signal is replicated via the CAN.Via the CAN line, ABS control unit M50 is connected - from pins 1 and 2 - to the engine management control unit M10, the Body Computer M1 and the instrument panel E50, to manage the ABS warning light and, if the problems concern the EBD function, the low brake fluid level/handbrake applied warning light.The autodiagnostic data can be read by connecting to connector C of the Body Computer M1 - pin 1: it receives signals from pin 6 of control unit M50 via the special diagnostic line.