EXTERIOR LAMPS - Headlamp Levelling

EXTERIOR LAMPS - Headlamp Levelling

DESCRIPTION

To prevent dazzling oncoming drivers, the headlamps can be adjusted to compensate for the effect of different loads on headlamp vertical alignment. Headlamp levelling is controlled by a four position switch mounted in the centre of the fascia, which operates a levelling motor on each headlamp. Nominal vehicle loads for each switch position are as follows:

• 0 - Driver or driver and front passenger only; no luggage.
• 1 - All seats occupied; no luggage.
• 2 - All seats occupied; full luggage compartment.
• 3 - Driver only; full luggage compartment.

Headlamp levelling operates while the side lamps or headlamps are on.

OPERATION

Feed from the battery positive terminal is connected to fusible link 6 of the engine compartment fuse box (C0632-1) by a brown wire. Fusible link 6 (C0571-3) is connected to the lighting switch (C0041-1) by a brown/blue wire.

With the lighting switch in either the side or main beam positions, current flows from the switch (C0041-2) to fuse 12 of the passenger compartment fuse box (C0581-1) on a red wire. Fuse 12 (C0581-4) supplies a feed to the LH headlamp levelling motor (C0071-3) and the RH headlamp levelling motor (C0070-3) on red/orange wires.

Fuse 12 (C0581-4) also supplies two feeds to the headlamp levelling switch on red/orange wires. One feed (C0093-5) is used to power the switch illumination bulb, which is earthed (C0093-3) on a black wire. The second feed (C0093-4) supplies current to the switch itself.