DESCRIPTION AND OPERATION
4.30
DEFENDER 1999 MY
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.