Alfa Romeo 159 2.2 JTS Da 01/06 – VDC – – VDC – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

WIRING DIAGRAM - VDC - Alfa Romeo 159 2.2 JTS Da 01/06

VDC - WIRING DIAGRAM Alfa Romeo 159 2.2 JTS Da 01/06

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COMPONENTS - VDC - Alfa Romeo 159 2.2 JTS Da 01/06

Component code	Description	Reference to the operation
B001	JUNCTION UNIT
B002	JUNCTION UNIT UNDER DASHBOARD
B099	MAXIFUSE BOX ON BATTERY
C010	LEFT FRONT EARTH	-
C012	ABS FRONT EARTH	-
C020	PASSENGER SIDE DASHBOARD EARTH	-
E050	INSTRUMENT PANEL
H035	TUNNEL SWITCHES
I030	BRAKE PEDAL SWITCH
K058	STEERING SENSOR
K070	LEFT FRONT WHEEL SENSOR FOR ABS
K071	RIGHT FRONT WHEEL SENSOR FOR ABS
K074	SLEWING SENSOR (VDC)
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 - VDC - Alfa Romeo 159 2.2 JTS Da 01/06

VDC - COMPONENT LOCATION Alfa Romeo 159 2.2 JTS Da 01/06

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Component code	Description	Reference to the operation
B001	JUNCTION UNIT
B002	JUNCTION UNIT UNDER DASHBOARD
B099	MAXIFUSE BOX ON BATTERY
C010	LEFT FRONT EARTH	-
C012	ABS FRONT EARTH	-
C020	PASSENGER SIDE DASHBOARD EARTH	-
E050	INSTRUMENT PANEL
H035	TUNNEL SWITCHES
I030	BRAKE PEDAL SWITCH
K058	STEERING SENSOR
K070	LEFT FRONT WHEEL SENSOR FOR ABS
K071	RIGHT FRONT WHEEL SENSOR FOR ABS
K074	SLEWING SENSOR (VDC)
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 - VDC - Alfa Romeo 159 2.2 JTS Da 01/06

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.On the most extensive version the ABS control unit also implements the VDC (Vehicle Dynamic Control), ASR (Anti-Slip Regulation) / MSR (Motor Slip Regulation) functions plus the HBA (Hydraulic Brake Assist) and HH (Hill Holder) functions.The VDC system intervenes on the engine and on the brakes producing a stabilizing torque when the ABS sensors detect conditions that could lead to the vehicle slipping.The VDC system components, in addition to those of the ABS system are:- a sensor that detects the position of the steering wheel (steering angle);- a sensor that detects the rotation of the vehicle around the vertical axis and lateral acceleration (centrifugal force) (yaw sensor);- if the Hill Holder function is present, a longitudinal acceleration sensor is incorporated in the lateral acceleration and yaw sensor;- a sensor which detects the pressure in the ABS hydraulic unit (integrated in the ABS control unit).The VDC system is always combined with the ASR system.The ASR system increases the active safety and stability of the vehicle controlling the slipping of the drive wheels: if slip is caused by the transmission of excessive power, the system cuts in, with the co-operation of the engine management control unit, to reduce engine power output MSR); if, on the other hand, slip is detected at one wheel only, the system cuts in to brake only the slipping wheel by means of the wheel''s modulating solenoid valve.The ASR comes on automatically whenever the engine is started: the system can be deactivated by means of an "ASR VDC" button on the control panel.When the system is off, a led on the button and a warning light on the control panel come on simultaneously. The VDC function, on the other hand, is switched on automatically each time the engine is started up and cannot be turned off.The Hill Holder system is designed to assist the driver when setting off on an incline.In effect the HH is capable of automatically providing sufficient braking torque to keep the vehicle stationary until the clutch is fully released and the engine toruqe is sufficient to start the vehicle comfortably.The HH is automatically activated when the brake pedal is pressed in conjunction with the following conditions: the vehicle speed equal to zero, the gradient more than 2% and the clutch pedal pressed; the moment the brake pedal is released, with all the other conditions being equal, the Hill Holder keeps the braking system pressurized for 1.5 seconds to allow the driver to move their foot from the brake pedal to the accelerator pedal without the vehicle slipping backwards and without using the parking brake.Once the accelerator is pressed, the Hill Holder continues to keep the vehicle still for a further 15 seconds or until the engine torque is sufficient to start the vehicle.The H.B.A. system aids the driver in emergency braking situations when the brake pedal is activated quickly and in poor load maintenance conditions; the system intervenes when the pressure gradient exceeds a certain level (fast application of brake pedal - emergency braking) multiplying the braking pressure at the wheels applied by the driver thereby producing the maximum deceleration that can be achieved.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.Similarly, for the VDC function: the ASR/VDC warning light: the warning light flashes when the system cuts in to notifiy the driver that the ASR has come on due to road grip conditions.When the control unit detects an error in the ASR or VDC function, it turns on the warning light in fixed mode.Lastly, when the control unit detects an error in the HH function, it sends a special message to the instrument panel display.As far as the ABS function only is concerned,For more detailsSee descriptions 3350

FUNCTIONAL DESCRIPTION - VDC - Alfa Romeo 159 2.2 JTS Da 01/06

The ABS-VDC electronic control unit M50 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 steering sensor K58 also receives an ignition-controlled power supply from the line protected by fuseF42 of the junction unit under the dashboard B2 and is connected via the CAN to control unit M50 and the other nodes.The yaw (and lateral and longitudinal acceleration) sensor K74 also receives an ignition-controlled power supply from the line protected by fuseF42 of the junction unit under the dashboard B2 and is connected via the CAN to control unit M50 and the other nodes.The "ASR VDC" control button in the controls H35 sends a deactivation signal to pin 3 of M50, whilst the signal that switches on the LED with the system turned off is sent from pin 4; switch H35 receives an ignition-controlled power supply from the line protected by fuse F35 of the junction unit under the dashboard B2.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.The ABS control unit M50 is connected, via the CAN - from pins 1 and 2 - to the engine management control unit M10, to the Body Computer M1 and to the instrument panel E50 to manage the various warning lights for the ABS.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.