184000367 - INTRODUCTION - MANOEUVRING AND WARNING SIGNALS
INTRODUCTION
The steering column switch unit is illustrated in the diagram.
COMPOSITION
casing
It is a part of the steering column switch unit containing the electrical circuits and the switching and automatic release mechanisms which return the left lever to the rest position once the steering wheel has been realigned.
ELECTRONIC MODULE
This is the electronic control unit which controls the wiping functions and is mechanically secured to the casing to which it is electrically connected by means of special terminals.It controls the operation of:
- Windscreen wiper: sweep rate
- Rear wiper: sweep rate and controlled by reverse;
- Windscreen washer function: ''smart'' washing;
- Rearscreen washer function:''smart'' washing;
- Rain sensor (management of signal coming from sensor
CLOCK SPRING
.
It has two functions:
- to transmit the rotation of the steering wheel to the automatic release mechanism inside the casing.
- to transfer the electrical signal for the controls on the steering column (horn and other optional serves) and connect the AIR-BAG module.
LEFT LEVER
It includes the lighting and direction indicator controls.All the commands are activated via the lever or the ring nut at the end of the actual lever.
Main lights switch
This control is at the end of the lever and is activated by turning a special ring nut.There are 3 stable positions for the ring nut when it is rotated in an anti-clockwise direction:
- Pos. 1 = No circuit switched on
- Pos. 2 = Side lights
- Pos. 3 = Side lights + go ahead for dipped/main beam headlamps + rear fog lamp.
- Pos. 4 = Side light and low beam Auto function
There are two signals (earth) sent from the steering column switch to the Body Computer which manage both the side lights and the dipped beam headlamps, in manual mode or AUTO mode (automatically switched on by dusk sensor):
- The ''Light 1'' signal - is sent to pin 28 of connector G of the Body Computer from the steering column switch, pin 7 of connector C.
- The ''Light 2'' signal - is sent to pin 2 of connector I of the Body Computer from the steering column switch, pin 8 of connector C.
| lights selector position | ''Light 1'' signal | ''Light 2'' signal |
|---|---|---|
| 1 - OFF | 1 | 1 |
| 2 - Side lights | 0 | 1 |
| 3 - dipped beam headlamps | 0 | 0 |
| 4 - AUTO lights | 1 | 0 |
Dipped/main beam headlamps switch
The operation is achieved by moving the lever perpendicular to the steering column (in other words lever moved from the rest position towards the dashboard).The control has two positions, one unstable and one stable.It is only possible to switch the dipped / main beam headlamps with the main lights switch (A) in position 3.Control for flasher - main beam
This is operated by pulling the lever from the rest position towards the centre of the steering wheel, the action is unstable as a result of which when the lever is released it returns to the rest position.Direction indicators control
The direction indicators are operated by moving the lever on the steering wheel plane in two directions - clockwise and anti-clockwise.The automatic release device intervenes for each stable position of the direction indicators and has the function of returning the lever to the rest position after the steering wheel has been realigned.RIGHT LEVER
This includes the front and rear wiper controls. All the commands are activated via the lever or the ring nuts on the actual lever. There is also a button on the end of the lever which controls the Trip Computer functions Characteristic of working principle 5560 INSTRUMENTS.
Electronic module
This is the electronic control unit which controls the operation of the electric windscreen and rearscreen wiper motors and the washing functions.In particular, it controls the operation of the:
- Windscreen wiper (stroke frequency for all versions);
- Rear wiper (stroke frequency and control by reverse engagement);
- Windscreen washer function (''smart'' washing for all versions);
- Rearscreen washer function (''smart'' washing for all versions);
- Rain sensor (management of signal coming from sensor, if fitted)
Windscreen wiper operation
The operation is achieved by moving the lever on the steering wheel, there are 5 different positions:Pos. 1 = Single stroke (unstable)Pos. 2 = No circuit switched on (stable): rest positionPos. 3 = Intermittent/Automatic (stable)Pos. 4 = 1st speed continuous (stable)Pos. 5 = 2nd speed continuous (stable)Windscreen wiper intermittent function / rain sensor sensitivity adjustmentThis control is at the end of the lever and is operated by rotating a special ring nut in a clockwise direction in 4 stable positions corresponding to:
- LOW trim level: from Pos. 1 to Pos. 4 = Increasing wiping frequency;
- HIGH TRIM LEVEL: from Pos. 1 to Pos. 4 = Increasing rain sensor sensitivity;
Rear wiper control
This control is on the lever and is activated by turning a special ring nut.The control has 2 stable positions and is turned in a clockwise direction:
- Pos. 1 = No circuit switched on;
- Pos. 2 = Rearscreen wiper activated;
Rear washer control
It is operated by pushing the lever towards the dashboard, the operation is unstable as a result of which when the lever is released it returns to the rest position.The activation of the control involves the simultaneous operation of the rearscreen wiper with the ''smart washing'' function (windscreen washer function). | Composition and operation of windscreep and rear wiper functions Characteristic of working principle 5550 WARNING AND MANOEUVRING INDICATORS. |
STEERING COLUMN SWITCH UNIT ELECTRONIC MODULE PIN-OUT
Rear view
| PIN | Function |
|---|---|
| 1 | n.c. |
| 2 | A Bus serial line (signal from rain sensor) |
| 3 | Rearscreen wiper positive enablement signal from reverse |
| 4 | N.C. |
| 5 | Headlamp washer enablement positive signal |
| 6 | Negative signal from windscreen wiper motor cam |
| 7 | Power earth |
| 8 | Second windscreen wiper speed |
| 9 | First windscreen wiper speed |
| 10 | Two-way pump (rearscreen washer positive) |
| 11 | Rear wiper/pump power supply |
| 12 | Two-way pump (windscreen washer positive) |
| PIN | Function |
|---|---|
| 1 | Rearscreen wiper motor supply |
| 2 | Signal from rear wiper cam |
| 3 | Main beam headlamps negative control |
| 4 | Flasher negative control |
| 5 | Right direction indicators/parking light negative signal |
| 6 | Left direction indicators/parking light negative signal |
| 7 | ''Light 1'' negative analogue control |
| 8 | ''Light 2'' negative analogue control |
| 9 | Signal earth |
| 10 | N.C. |
| 11 | Trip Computer function negative signal from SET button |
| 12 | Rearscreen wiper supply |
SWITCH UNIT WITH CRUISE CONTROL VARIANT
The engine managment systems for petrol engines with motorized throttles and diesel engines with electronically controlled injection times include the Cruise Control function, i.e. a system which automatically maintains the cruising speed set by the driver.
The Cruise Control lever is integrated in the steering column switch unit, the third lever incorporates the following controls:
- a switch with a ring nut for activating/deactivating the Cruise Control;
- a switch with a ring nut with the function of memorizing the vehicle speed increase/decrease;
- a Resume button for recalling the memorised speed.
| Constitution and operation of Cruise Control functions Characteristic of working principle 5580 SPECIAL ACCESSORIES]. |