Headlamp Dipped Beam

Headlamp Dipped Beam Components:

Headlamp Dipped Beam Diagrams:

Locations of components

7 Earthing point
On the radiator cross-member

8 Lighting relay
In the electrical distribution box in the engine compartment, on the left-hand wheel housing

10 Light switch
On the left-hand side of the facia

12 Dipped beam
In the left-hand and right-hand headlamps

20 Ignition switch
On the centre console between the front seats

22 Fuse box
In the electrical distribution box in the engine compartment, on the left-hand wheel housing

58 12-pole connector
On the angle bracket, under the facia on the left-hand side (behind the knee shield)

152A 29-pole white connector
152B 29-pole red connector
In the electrical distribution box in the engine compartment, on the left-hand wheel housing. The connectors are accessible from the interior of the car

158 Negative distribution terminal
In the electrical distribution box in the engine compartment, on the left-hand wheel housing

215 Dip switch
On the left-hand side of the steering column

Operation
To enable the headlamps to be switched to dipped beam, ignition switch 20 must be in the parked or drive position. Current will then flow to terminal X of light switch 10.

When the light switch is in position 2, the supply will be taken from terminal 56 to the "upper" coil in lighting relay 8, via the 29-pole red connector 152B. The relay coil will be energized and the contacts will beset in their "left-hand" position. Dipped beam lamps 12 are supplied (+30) via the contacts of the "lower" coil and terminal 56B, across fuses 16 and 17.

The "lower" coil is used for switching between full beam and dipped beam. Each time the coil is energized by operation of dip switch 215, the contacts change position and remain there until the dip switch is operated again.

Parking lights
When the headlamps are on dipped beam, parking lights 13 (which also include rear lights 14 and number plate illumination 15) will also be alight. (On certain markets, driving lights 81 and and side marker lights 234 are also included.)

When the dipped beams are switched on, the supply to the parking lights is taken from light switch 10 in position 2 via terminals X and 58. The parking lights are discussed in a separate section.

Fault-tracing hints
The dipped beams will be operative when ignition switch 20 is in the parked or drive position and when light switch 10 is in position 2.

1. Check fuses 16 and 17 and check that the sup- ply to them is live.

2. Check the bulbs and check that the supply to them is live. Check the earthing at each lamp.

3. Check the light switch, the lighting relay and the dip switch.

4. Check the connectors, cable harnesses and earth connections.