Headlamps

��XHeadlamps:

WIRING DIAGRAM

Headlamps - Component Location:

COMPONENT LOCATIONS
8 Main beam relay on main relay board in the engine bay.
8A Dipswitch relay on main relay board in the engine bay.
10 Lights switch on dashboard between steering wheel and driver's door.
11 Main beam in LH and RH headlamps.
12 Dipped beam in LH and RH headlamps.
22A Main fuse board in the dashboard.
47G Main beam indicator lamp in the main instrument display panel.
47V Lights on indicator lamp in the main instrument display panel.
215 Dipswitch on the left of the steering column.
228B Filament monitor, headlamps, on main relay board in the engine bay.
342A Main fuse board in the engine bay.
500 ICE control module
LHD: above main relay board in dashboard
RHD: behind main relay board in dashboard
521 "DEFECTIVE LAMP" indicator lamp in main instrument display panel 1.
540 Main instrument display panel on the dashboard.
541 SID unit on the dashboard.
544 Information lamp "INFO DISPL" in main instrument display panel 2.

10-pin connector
H10-2 On the bracket below the left-hand A pillar.

33-pin connector
H33-2 Black connector on bracket below the left-hand A pillar.

Grounding Points
G30 Grounding point, left-hand structural member behind the battery.
G31 Grounding point, right-hand structural member, in the engine bay on the right-hand side.
G33S Grounding point, connector bracket (Signal) below the left-hand A pillar.

DESCRIPTION OF OPERATION
When the headlamps are switched ON, the parking lights, which also include the rear lights and number plate lighting, will also light up. The parking lights are dealt with separately.

Main Beam
Before the main beams can be switched ON, ignition switch 20 must be in the X position. Current is then supplied to lights switch 10, terminal X.

Dipswitch 215 is spring-loaded.

When the lights switch is in position 2, current goes to pin 40 of Integrated Central Electronics (ICE) control module 500 and when dipswitch 215 is pressed, pin 8 of the ICE control module will ground dipswitch relay 8A.

Current (+30 circuit) is supplied via lighting relay 8 and dipswitch relay 8A to the main beam filaments via filament monitor 228B and fuses 8 and 9 (main beam indicator lamp 47G in the main instrument display panel is also supplied with current via fuse 8).

When the main beams are switched ON, current for the parking lights is taken from light switch position 2 via pin 58.

Headlamp Flasher
Main beams can be switched on regardless of the positions of the ignition switch and lights switch. By keeping the dipswitch pressed, current is supplied directly to the main beam filaments via filament monitor 228B and fuses 8 and 9.

Dipped Beam
When the lights switch is in position 2, current will be supplied to pin 40 of ICE control module 500 and pin 33 of the control module will ground lighting relay 8. Current is then supplied via the dipswitch relay to the filament monitor and then to fuses 6 and 7 and dipped beam filaments 12.

If a main or dipped beam filament should fail, the relay in the filament monitor will operate and terminal C2 will be grounded.

Since pin 4 of the SID unit is grounded, the SID unit lights up "DEFECTIVE LAMP" indicator lamp 521 (main instrument display panel 1) or the INFO DISPLAY lamp and a message is displayed at the same time on the SID unit (main instrument display panel 2).

Safety Circuit
When lights switch 10 is in position 2, current (+X circuit) is applied to lighting relay 8 from pin 56 of the lights switch to terminal 87A of the relay and then to the dipped beam filaments via dipswitch relay 8A and filament monitor 228B.

It is not possible to switch between main beam and dipped beam.

Indicator Lamp, Lights ON, 47V
The main instrument display panel incorporates indicator lamp 47 Voltswhich shows when the headlamps are switched ON. The indicator lamp is supplied with current from pin 58 of lights switch 10 via fuse 30.


FAULT DIAGNOSIS HINTS
The headlamps will be switched ON when ignition switch 20 is in position X and lights switch 10 in position 2.
1. Check that fuses 8 and 9 (main beam) and 6 and 7 (dipped beam) are intact and supplied with current.
2. Check fuse 27 if the headlamp flasher does not work.
3. Check that the bulbs are OK and supplied with current.
4. Check the grounding of each lamp.
5. Check connectors, wiring and ground connections.

IMPORTANT:
When fitting a replacement bulb, always make sure that it is of the correct rating.
If it is not, the "DEFECTIVE LAMP" or "INFO DISPL" lamp in the main instrument display panel will light up due to imbalance in the filament monitor.
The car's wiring and headlamp reflectors are not designed for higher ratings.