Main Beam

Main Beam

When the lighting switch is turned to the headlamp position, and pulled back to the main beam position, current flows across the switch (C0041) to the main/dipped beam relay coil (C0587) on a UW wire. The main/dipped beam relay coil is located within the passenger compartment fuse box (C0587) and is earthed on a B wire.

The energised main/dipped beam relay allows a feed from fusible link 9 of the engine compartment fuse box (C0570) to provide a feed to fuse 18 and fuse 20 of the passenger compartment fuse box. Fuse 18 (C0584) provides a feed to the RH headlamp main beam bulb (C0011) on a UG wire. Fuse 18 (C0233) also provides a feed to the warning lamp located within the instrument pack (C0233) on a UG wire. Both are earthed on B wires.

Fuse 20 (C0587) provides a feed to the RH main beam bulb (C0009) on a US wire. The bulb (C0009) is earthed on a B wire.

Headlamp Flash

When the LH column switch is pulled back (but not past) spring pressure, the headlamps operate in exactly the same way as described in the 'Main Beam' section until the switch is released.

CCU When the lighting switch is turned to the main beam position, current flows across the switch (C0041) to the CCU (C0428) on an OU wire. The CCU also monitors the condition of the driver door switch, and the ignition switch. If the driver door switch is closed and the ignition switch in the 'off' position, the CCU will power its integral 2 KHz sounder.

For more information on the driver door switch, refer to the Anti-theft Alarm and Central Door Locking (CDL) section of this manual.  ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL).