STEERING COLUMN SWITCH UNIT

INTRODUCTION

The drawings which follow illustrate the controls which can be used through the steering column switch unit. This applies to both the versions with non Adaptive Cruise Control and with Adaptive Cruise Control.

• A - Perspective view
• B - Front view
• 1 Steering column switch unit
• 2 Clock spring

COMPOSITION

The casing

The casing is the part of the steering column switch unit that contains the electrical circuits and the switching and automatic release mechanisms which return the left (direction) lever to the rest position, following the realignment of the steering wheel, after a manoeuvre has been carried out.

• 1 Front view
• 2 Rear view
• 3 Right lever with front wiper controls
• 4 Left lever with lighting/direction indicators/Cruise Control controls
• 5 Built in electronic module
• ABC - Connectors

The front section of the CASING houses the CLOCK SPRING which is the interface element with the steering wheel.

The ELECTRONIC MODULE is connected to the CASING, whilst the rear section of the CASING contains the housings for the electrical connectors.

Electronic module

This is the electronic control unit which controls the wiper functions and it is mechanically fastened to the CASING to which it is connected electrically by means of special terminals.

It controls the operation of the:

• windscreen wipers
• windscreen/headlamp washers
• rain sensor

Clock spring

It has two functions:

• to transmit the rotation of the steering wheel to the automatic release mechanism located inside the CASING,
• to transfer the electrical signal for the controls on the steering wheel (horn and other optional services) and to connect the Air Bag module.

• 1 Front view
• 2 Rear view
• 3 Air Bag connectors
• A - Connector joined to dashboard wiring (Steering angle)
• B - Connector joined to dashboard wiring (Air Bag)
• C - Steering wheel node connector

Connector A

Connector B

Connector C

Multifunction switch or left lever

This includes the lighting controls (main beam only), direction indicators and controls for the Cruise Control system (the latter varies depending on whether or not the adaptive Cruise Control system is fitted).

Multifunction switch or right lever

This includes the wiper controls. All the controls are activated by operating either the lever or the ring nut on the actual lever.

Steering column switch unit electronic module pin out

The diagram below illustrates the steering column switch unit module connectors

Connector A

Connector B

Connector C

Connector D

Follow me home

This function, which allows the dipped headlamps and the side lights to remain on after the vehicle has been switched off (KEY OFF) with the CLE (Exterior Lights Control Unit) in the PARK or "0" position for 30 seconds or multiples thereof, is activated using the headlamp flasher lever.

For further details see function F048.

(See subassembly ) 5505 INSTRUMENT/GAUGE ELECTRICAL CIRCUITS