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LH and RH headlamp
units contain individual bulbs for headlamp main and dipped beams,
and for the side lamps. Tail lamp bulbs are incorporated into the
tail lamp units. Rear number plate illumination is provided by two
lamps installed in the rear bumper. Operation of the headlamps and
side lamps is controlled by a lighting switch in the steering column
LH stalk.
A ’lights on’ alarm is installed to prevent the lights being inently
left on when the vehicle is parked.
How it should
operate:
Power supplies
Fuse 7 in the under bonnet fuse box supplies a permanent feed to the
multi function ECU (MFU) on a Purple-Brown wire.
Fusible link 1 in the under bonnet fuse box supplies two permanent
feeds to the lighting switch on brown wires. Fusible link 4 in the
under bonnet fuse box supplies a permanent feed to the ignition switch
on a Brown-Purple wire. When the ignition switch is turned to position
II, the feed is supplied to fuse 1 in the passenger compartment fuse
box on a Black-Yellow wire. Fuse 1 supplies the feed to the multi
function ECU (MFU) on a Green wire.
Side lamps
Turning the lighting switch to the side lamps position connects a
feed from the lighting switch to fuses 7 and 8 of the passenger compartment
fuse box on Red wires. Fuse 7 feeds the RH side lamp and the RH tail
lamp on Red-Orange wires. Fuse 8 feeds the LH side lamp, LH tail lamp,
LH rear number plate lamp and RH rear number plate lamp on Red-Black
wires.
All of the lamps are earthed on Black wires and illuminate.
Headlamps
Dipped beam
Turning the lighting switch to the headlamps position operates the
side lamps as detailed above and also connects a feed from the lighting
switch to fuses 10 and 11 of the passenger compartment fuse box on
a Blue-Pink wire. Fuse 10 feeds the LH headlamp dipped beam on a Blue-Pink
wire. Fuse 11 (C0585) feeds the RH headlamp dipped beam on a Blue-Black
wire. Both headlamp dipped beams are earthed on the same Black wires
as the side lamps and illuminate.
Main beam
Selecting main beam connects a feed from the lighting switch to fuses
21 and 22 of the satellite fuse box on a Blue-White wire. Fuse 21
feeds the RH headlamp main beam on a Blue-Green wire. Fuse 22 feeds
the LH headlamp main beam on a Blue-Slate wire. Both headlamp main
beams are earthed on the same Black wires as the
side lamps and illuminate.
Main beam flash
Operating the main beam flash bypasses the main beam contacts in the
lighting switch and operates the main beam circuits as detailed above.
When the switch is released the circuit is broken and the headlamp
main beams are extinguished.
Lights on alarm
The multi function ECU (MFU) operates an integral warning sounder
if the lights are on with the ignition off and the driver’s door open.
When the side lamps or headlamps are on, the multi function ECU receives
a feed from fuse 8 of the passenger compartment fuse box on a RB wire.
When the ignition switch is in position II, the multi function ECU
receives a feed from fuse 1 of the passenger compartment fuse box
on a Green wire. When the driver’s door opens, the Purple-White wire
(LHD models) or Purple-Slate wire (RHD models), between the multi
function ECU and the driver’s door lock motor, is connected to earth
on the Black wire between the driver’s door lock motor and an earth
point (on LHD models) or earth header (on RHD models). While the driver’s
door is open, if the side lamps or headlamps are on and the ignition
switch is not in position II, the multi function ECU switches the
warning sounder to earth on a Black wire connected to an earth header
and the warning sounder operates.
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