323001431 - 5550 WARNING AND MANOEUVRE SIGNALS

STEERING COLUMN SWITCH UNIT MODULE

The steering column switch unit module includes the exterior lighting controls (on the lights lever on the left) and the windscreen/rearscreen washing and wiping controls (on the wiper lever on the right).The module also houses the Trip function button (right side) and the Cruise Control lever (optional).

Introduction

The steering column switch unit basically groups the following functions together:- Controls for exterior lights and direction indicators- Controls for windscreen washing and wiping functions- TRIP function button- Controls for Cruise Control

Operation

Left leverA - Lights selectorB - Lights flasher - main beam headlamps switchC - Direction indicatorsLight selectorThe selector is a ring nut with 3 stable positions located at the end of the lever and activated by turning it along the axis of the lever.- Pos. 1 = No circuit operated- Pos. 2 = Side lights- Pos. 3 = Dipped headlampsFlasher - main beam headlamps switchThe "light flasher" control is operated by pulling the stalk from rest position towards the steering wheel; the operation is unstable i.e. the stalk returns to the rest position when released.The "fixed main beam headlamps" command is produced by pulling the lever in the same way as for the flasher but making it complete a greater travel, as far as the second position ("main beam headlamps" contact).To switch the main beam headlamps off, the lever must be pulled to the main beam position in the same way as for switching them on.Direction indicators controlThe command is produced by moving the lever on the steering wheel plane in both directions, upwards for the right direction indicators and downwards for the left ones.The lever has two distinct activating modes: one unstable one known as "changing lane" and one stable one known as "changing direction".The unstable activation on the release of the lever reopens the electrical contact that has closed.The stable activation has an automatic release device that returns the lever to the rest position when the manoeuvre is completed (rotation of the steering wheel in the same direction as the lever).Right leverWindscreen wiper controlThe windscreen wiper is operated by moving the lever along the plane of the steering wheel. There are 5 different activation positions, from the bottom, in this order:- Antipanic (unstable A)- OFF- Intermittent / Automatic- Continuous 1st speed- Continuous 2nd speedWindscreen wiper intermittent selector (rain sensor sensitivity)The adjustment takes place by turning the ring nut into 4 stable positions.4 different pause times for the intermittent operation of the windscreen wiper correspond to these positions.If a rain sensor is fitted, the positions correspond to the 4 rain sensor settings.- MAX pause (MIN setting)- Medium - high pause (setting 2)- Medium - low pause (setting 3)- MIN pause (MAX setting)Windscreen washer controlThe control for activating the two-way pump for washing the front windscreen is produced by pulling the lever towards the steering wheel crown; the activation is unstable.TRIP buttonBy pressing the unstable TRIP button on the lever the relevant commands are sent to the instrument panel.Cruise control lever    See descriptions 5580A CRUISE CONTROL SYSTEM

Electrical connections

The steering column switch unit is connected to the vehicle wiring by means of a single connector.All the signals sent are the digital type so that multiple information is sent through a single connection.connector A steering column switch unitconnector B clock springSteering column switch unit pin out (connector a)The steering column switch unit, available in two versions depending on whether or not there is Cruise Control, has the following pin outs.STEERING COLUMN SWITCH UNIT, with Cruise Control (black, 18 pin)

Pin	Description
1	CRUISE ON
2	Ignition-controlled supply (INT from F51 junction unit under dashboard) Cruise control lever
3	Cruise button (RESUME)
4	Left/right direction indicators analogue signal to Body Computer
5	Main beam / flasher command signal to Body Computer
6	Side lights / dipped headlights analogue signal to Body Computer
7	Not connected
8	Screen washer pump analogue signal
9	Not connected
10	Cruise control lever (UP)
11	Cruise control lever (DOWN)
12	Not connected
13	Analogue sinal from screen wiper lever (OFF, intermittent / AUTO, 1st speed, 2nd speed, panic) to Body Computer
14	Horn relay coil control signal to Engine Compartment Junction Unit
15	Signal from Trip Computer functions control button to Instrument Panel
16	Stalk unit earth
17	Earth for horn relay coil operation
18	Not connected

STEERING COLUMN SWITCH UNIT, without Cruise Control (black, 12 pin)

Pin	Description
1	Left/right direction indicators analogue signal to Body Computer
2	Main beam / flasher command signal to Body Computer
3	Side lights / dipped headlights analogue signal to Body Computer
4	Not connected
5	Screen washer pump analogue signal
6	Not connected
7	Analogue sinal from screen wiper lever (OFF, intermittent / AUTO, 1st speed, 2nd speed, panic) to Body Computer
8	Horn relay coil control signal to Engine Compartment Junction Unit
9	Signal from Trip Computer functions control button to Instrument Panel
10	Stalk unit earth
11	Earth for horn relay coil operation
12	Not connected

Clock spring (connector b)The clock spring transfers the electrical signal to controls on the steering wheel (horn and other optional controls) and connects the airbag module without risk of breakage.

Pin	Description
1	Not connected
2	Not connected
3	Right radio control on steering wheel to Body Computer
4	Left radio control on steering wheel to Body Computer
5	Controls lighting power supply
6	Radio controls earth to Body Computer
7	Horn controls and lighting controls earth
8	Control on steering wheel for horns
9	Driver''s air bag - 2nd stage (+)
10	Driver''s air bag - 2nd stage (-)
11	Driver''s air bag - 1st stage (+)
12	Driver''s air bag - 1st stage (-)

For more details,    See descriptions 5570 ACCESSORIES     See descriptions 5580C AIR BAG SYSTEM