125000395 - INTRODUCTION - SCREEN WASHERS AND HEADLAMP WASH/WIPE
SPECIFICATIONS
INTRODUCTION
The vehicle is equipped with a system that cleans and washes the front windscreen. The vehicle may be fitted as an option with a pressurised liquid washing system for the front headlamps.
RESERVOIR
The reservoir is located in the right side of the wheel arch compartment and it allows the screen washer system pump to supply the water-antifreeze mixture required to clean the front window. If the vehicle is equipped with the relevant option, it also supplies the headlamp washer system via a special pump.The reservoir capacity ensures a minimum of 25 washing cycles and it ranges in size from a minimum of 5 litres for the version without a headlamp washer to up to 6 litres if equipped with a headlamp washer.The reservoir is made out of plastic and contains external housings for the pump that supplies the windscreen washer and headlamp washers (if fitted).
WINDSCREEN WASH/WIPE
The windscreen wash/wipe assembly cleans and washes the windscreen.Two types are supplied, depending on the vehicle specification level (basic and deluxe). These differ essentially in the presence (as an option) on the deluxe version of an electronic detection device that identifies the presence of water drops on the windscreen (rain sensor).The innovative features of the windscreen washer assembly are essentially:
- The electronic control system is separate from the control motor whereas both units were contained in a single component on the previous wipers.
- The smart wash operating strategy applied for the windscreen wiper.
- The presence (optional) of a rain sensor
Due to the electronic control system and according to the position of the right steering wheel stalk switch, the system manages operation of the direct current wiper motor by means of two windings, i.e. at two rotating speeds.
- Low speed: 45 ± 5 rpm
- High speed: 65 ± 7 rpm
Composition and operation
The front winscreen wiper assembly consists essentially of the following components:
- two wiper arms with blades. The wiper arms come in two types: profiled arms with low parking position (for ECE areas), conventional arms without low parking position (for SAE areas), blades used in the conventional system with parallel, synchronous movement.
- a d.c. electric motor that allows arm movement and is equipped with a cam (consisting essentially of an active switch with earth) that notifies the electronic control system of motor lock. A motor with rated or 12V voltage can operate at voltages between 9-16V. It is equipped with a thermal protection switch and electromagnetic interference circuits for long, medium, short and ultrashort wavelengths on both vehicles.
- a pump driven by the right steering wheel stalk switch takes up washer fluid from the reservoir and feeds the jets on the bonnet lid through pipes.
Multifunction switch or right lever
This includes the wiper controls.All the controls are activated by operating either the stalk or the wheel control on the actual lever.A button on the end of the stalk switch also controls trip computer functions.Below is a list of the right stalk lever controls:
This is operated by moving the stalk lever in the same plane as the steering wheel. The control can be operated to 5 different positions:
- Pos. 1= No circuit activated (STABILE) [POS. REST];
- Pos. 2 = Panic function (UNSTABLE) [ANTICLOCKWISE];
- Pos. 3 = Intermittent / Automatic(STABLE) [CLOCKWISE];
- Pos. 4= Continuous 1st SPEED (STABLE) [CLOCKWISE];
- Pos. 4= Continuous 2nd SPEED (STABLE) [CLOCKWISE];
The control is located at the end of the stalk and operated by turning a wheel control clockwise to 4 stable positions corresponding to:
- BASIC SPECIFICATION: Pos. 1 - Pos. 4 = Increasing sweep frequency;
- HIGH SPECIFICATION: Pos. 1 - Pos. 4 = Increasing rain sensor sensitivity;
Electronic module (built into steering wheel stalk unit)
This control unit controls the operation of the electric motors, front and rear wipers and the smart washer functions. It is secured mechanically to the CASE to which it is connected electrically by means of terminals.In particular, it controls the operation of:
- Winscreen wiper (Sweep rate for all specifications);
- Screen washer function (Smart washing on all specifications);
- Rain sensor (Manages signal from the sensor, high specification).
| Mode | Tpause [s] | Beats per minute |
|---|---|---|
| 1 | 4.7 ± 0.2 | 10 |
| 2 | 2.7 ± 0.1 | 15 |
| 3 | 1.7 ± 0.1 | 20 |
| 4 | 1.1 ± 0.1 | 25 |
 | Where Tpause is the interval between the end of one windscreen wiper beat at the beginning of the next. |
Windscreen washer function:
Control operation simultaneously operates the winscreen wiper at 1st speed in smart wash mode, i.e. it controls pump activation with a delay of 0.5 secs, three wiper beats to allow washing and then wiping of the wet glass.After wipe functionAfter operation of the WINDSCREEN WASHER FUNCTION, this carries out one extra windscreen wiper beat (in 1st speed) after time T = 6 seconds to remove traces of fluid from the glass.This function is active only when the windscreen wiper is not on (windscreen wiper control stalk in position 1 - no circuit on).Automatic operation (with rain sensor)
When the right lever is moved to intermittent/automatic position A1, the rain sensor is activated.The frequency of the windscreen wiper strokes is automatically adjusted depending on the amount of water on the windscreen. the frequency varies continuously from nil (no stroke - windscreen dry) to wiping at the second continuous speed (heavy rain)Activation of the RAIN SENSOR drives the windscreen wiper arm through stroke as feedback to confirm that it has been switched on.It is also possible to alter the sensitivity of the RAIN SENSOR by operating wheel A1 at the end of the right stalk.If the panel is off (key-off), the RAIN SENSOR places the windscreen wiper system in stand-by when the stalk is left in AUTOMATIC position. Next time the ignition key is turned on, no wipe cycle is performed even if rain is present.To restore AUTOMATIC system operation, only of the following manoeuvres may be performed on the steering wheel stalk unit wiper stalk:
- the stalk may be moved from AUTOMATIC position to any other position and return to AUTOMATIC position;
- sensitivity may be adjusted by turning the WHEEL (increased or decreased).
Recovery function
When the rain sensor is supplied with power, it supplies at least six output pulses during the first 200 ms of operation as shown in the figure.If these six pulses are absent, one of the following situations is present:
- The sensor is operating incorrectly;
- The signal cable is disconnected;
- The signal cable is connected to earth;
- The signal cable is connected to the supply voltage.
The recovery function allows the presence of one of the malfunctions listed previously to be identified (but not which one) as follows:
- at key on and whenever the user moves the stalk to the intermittent position, the microcontroller supplies the rain sensor with power for 200 ms. If the six pulses are not received from the rain sensor, the wiper function control system ignores subsequent information from the sensor and operates as described under the heading "Windscreen wiper operation". Once an error situation occurs, the system continues to operate in manual mode until the ignition is turned off when the error status is reset.
- During normal rain sensor operation: if the signal from the sensor remains at the low logic level for longer than 2 seconds, the sensor management software module informs the windscreen wiper control software module that an anomalous situation is present. The windscreen wiper motor control system reacts to this information by making the windscreen wiper operate as described under the heading "Windscreen wiper operation"
Windscreen washer electric pump
The electric windscreen washer pump is activated through the right steering column switch unit lever.When the right steering wheel stalk is moved toward the driver (unstable position), the pump is supplied with electricity so that the front sprays may be supplied.Heated (and unheated) spray nozzles
The heated spray nozzles generally consist of a case that determines the external appearance. This contains a seat with an insert that produces the spray and a heating system that allows the jet to emerge even if the temperature is low.The insert is oriented so that the jet is prevented from strking surfaces other than the windscreen or headlamp surface.
The heated sprays are connected to the facia control unit under the same relay that supplies the electric door mirror and heated rear window heater circuit, they are therefore activated using the same operating strategy as these two circuits, i.e.:
- By pressing the heated rear window control button connected to the climate control node (NCL) and then sent as a status to the body computer node (NBC) by means of the CAN network.
- By pressing the MAX-DEF button (in the same way as above).
- Automatically once only as though it were a manual control if the ignition is turned on with outdoor temperature > 3°C.
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