E3080 Headlamp geometry adjustment

Description

A device allows the headlamp beam to be adjusted, directly from the driver's seat, in accordance with the load. The headlamps are thus always aligned quickly and correctly.

The adjustment device consists of a motor mounted on each of the two headlamps which tilts them as appropriate, lowering the light beam if the car is heavily laden, and raising it if the load decreases.

A specific knob on the dashboard selects the four positions indicated:

• position 0 - one or two persons on the front seats, full fuel tank, car fully equipped and in running order;
• position 1 - five persons;
• position 2 - five persons with luggage compartment full (about 50 kg);
• position 3 - driver and 300 kg load, all stowed in boot.

The adjustment button is on the left of the actual instruments, together with the button for zeroing the mileometer and the instrument lighting dimmer switch; The control switches have symbols which are lit up when the side lights are on.

The device is enabled only when the dipped beam headlamps are on.

The headlamp adjustment circuit is protected by the same fuses as the dipped beam headlamps circuit, located in the junction unit.

Description of operation

The headlamp alignment device in H10 is supplied at pin 3 by a line coming from the circuit for the dipped beam headlamps, protected by fuse F5 of the junction unit B1; this line only supplies voltage to the regulator when the dipped beam headlamps are switched on. ( Wiring diagram E2011 DIPPED HEADLAMPS ) this line provides voltage to the regulator only when the dipped beams are on.

Pin 4 of device H10 is earthed, whilst pin 2 sends the signal to adjust the motors N30 (left) and N31 (right), through a resistive divider which alters the output voltage depending on which of the four positions has been selected.

Motors N30 and N31 contain a transducer that establishes actual motor travel on the basis of the voltage of an adjustment signal received by pin 2 from device H10. The motors are supplied through pins 3 from the line (part of the dipped beam circuit) that supplies device H10, while pins 1 are earthed.

The headlamp alignment device H10 is lit up (at pin 1) when the side lights are switched on by means of the line coming from the switch for the steering column switch unit H5 and protected by the controls illumination fuse B11 up to 2/99 or fuse F4 of the additional fuse box B98B from 2/99.

Wiring diagram

Components

Component location