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Head, Side and Tail Lamps




HEAD, SIDE AND TAIL LAMPS

DESCRIPTION

General
Operation of the head, side, tail, and side marker (NAS vehicles only) is controlled by the Light Check Module (LCM). The LCM receives inputs from other systems via the I Bus.

Two headlamp systems are available; Halogen or bi-xenon. The two types of headlamps share a common lense.

NOTE: NAS vehicles are fitted with headlamp lenses marked with a Department of Transport (DOT) rating

The bi-xenon headlamps illuminate when an arc of electrical current is established between two electrodes within the bulb. The xenon gas sealed in the bulb reacts to the electrical exitation and the heat generated by the current flow. The causes the gas to produce a blue/white light.


WARNING: The bi-xenon system generates up to 28000 volts and contact with this voltage could lead to fatality. Ensure the headlamps are switched off before working on the system.


OPERATION

Halogen System

Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fuse 53, fusible link 3, and fusible link 4 on an R wire. All are located in the passenger compartment fuse box. Fusible link 3 (C0589) and fusible link 4 (C0590) provide constant battery feeds to the Light Check Module (LCM) (C0937 & C2039 respectively) on a pair of R wires. The LCM (C2039) is earthed on an N wire.

Fuse 53 (C0583) provides a constant battery feed to the ignition switch (C0028 on V8 vehicles) on an R wire. When the ignition switch is turned to the 'auxiliary' position, current flows across the switch (C0028 on V8 vehicles) to fuse 9 of the passenger compartment fuse box (C0585) on a PB wire. Fuse 9 (C0587) provides an auxiliary ignition feed to the LCM (C2040) on a PY wire.

When the ignition switch is turned to the 'ignition' position, current flows across the switch (C0028 on V8 vehicles) to fuse 4 of the passenger compartment fuse box (C0585) on a G wire. Fuse 4 (C0587) provides an ignition feed to the LCM (C2040) on a GS wire.

Light Check Module
The LCM (C2040) is located at the base of the RH 'A' post, and monitors the condition of the fascia mounted rotary lighting switch (C0041) by providing a feed on an NB wire. The LCM can determine the position of the switch by sensing if a feed is returned on a Y (side lamps) or a B (headlamps) wire. The LCM also monitors the condition of the column mounted main/ dipped beam switch (C1832) via a U wire.

Side Lamps
If the LCM detects that side lamps have been selected, it provides a feed to the following:
- To the RH side lamp (C0537) on an SU wire
- To the LH side lamp (C0538) on an SG wire
- To the RH tail lamp (C0125) on an SW wire
- To the LH tail lamp (C0121) on an SP wire
- The rear number plate lamp (C1495) on an SN and an SB wire
- To the RH front side marker lamp (C0916) on an SU wire (NAS vehicles only)
- To the RH rear side marker lamp (C0918) on an SU wire (NAS vehicles only)
- To the LH front side marker lamp (C0917) on an SG wire (NAS vehicles only)
- To the LH rear side marker lamp (C0919) on an SG wire (NAS vehicles only).

All are earthed on N wires.

Headlamp Dipped Beam
In addition to the lamps outlined in the side lamps section, the LCM will provide feeds to the following lamps if it detects that headlamp dipped beam has been selected:

- To the RH headlamp dipped beam bulb (C0011) on a YU wire
- To the LH headlamp dipped beam bulb (C0009) on a WG wire.

Both are earthed on N wires.

Headlamp Main Beam
In addition to the lamps outlined in the side lamps and headlamp dipped beam sections, the LCM will provide feeds to the following lamps if it detects that headlamp main beam has been selected:
- To the RH headlamp main beam bulb (C0011) on a WU wire
- To the LH headlamp main beam bulb (C0009) on a YG wire.

Both are earthed on N wires.

Bi-Xenon System
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fuse 53, fusible link 3, and fusible link 4 on an R wire. All are located in the passenger compartment fuse box. Fusible link 3 (C0589) and fusible link 4 (C0590) provide constant battery feeds to the Light Check Module (LCM) (C0937 R C2039 respectively) on a pair of R wires. The LCM (C2039) is
earthed on an N wire.

Fuse 53 (C0583) provides a constant battery feed to the ignition switch (C0028 on V8 vehicles) on an R wire. When the ignition switch is turned to the 'auxiliary' position, current flows across the switch (C0028 on V8 vehicles) to fuse 9 of the passenger compartment fuse box (C0585) on a PB wire. Fuse 9 (C0587) provides an auxiliary ignition feed to the LCM (C2040) on a PY wire.

When the ignition switch is turned to the 'ignition' position, current flows across the switch (C0028 on V8 vehicles) to fuse 4 and fuse 32 of the passenger compartment fuse box (C0585) on a G wire. Fuse 4 (C0587) provides an ignition feed to the LCM (C2040) on a GS wire.

Fuse 32 of the passenger compartment fuse box (C0585) provides an ignition feed to LH bi-xenon headlamp (C0009) on a GR wire. Fuse 32 (C0587) also provides an ignition feed to the RH bi-xenon headlamp (C0011) on a GR wire.

Light Check Module
The LCM (C2040) is located at the base of the RH 'A' post, and monitors the condition of the fascia mounted rotary lighting switch (C0041) by providing a feed on an NB wire. The LCM can determine the position of the switch by sensing if a feed is returned on a Y (side lamps) or a B (headlamps) wire. The LCM also monitors the condition of the column mounted main/dipped beam switch (C1832) via a U wire.

Side Lamps
If the LCM detects that side lamps have been selected, it provides a feed to the following:
- To the RH side lamp (C0537) on an SU wire
- To the LH side lamp (C0538) on an SG wire
- To the RH tail lamp (C0125) on an SW wire
- To the LH tail lamp (C0121) on an SP wire
- The rear number plate lamp (C1495) on an SN and an SB wire
- To the RH front side marker lamp (C0916) on an SU wire (NAS vehicles only)
- To the RH rear side marker lamp (C0918) on an SU wire (NAS vehicles only)
- To the LH front side marker lamp (C0917) on an SG wire (NAS vehicles only)
- To the LH rear side marker lamp (C0919) on an SG wire (NAS vehicles only).

All are earthed on N wires.

Headlamp Dipped Beam
In addition to the lamps outlined in the side lamps section, the LCM will provide feeds to the following lamps if it detects that headlamp dipped beam has been selected:
- To the RH headlamp dipped beam bulb (C0011) on a YU wire
- To the LH headlamp dipped beam bulb (C0009) on a WG wire.

Both are earthed on N wires.

Headlamp Main Beam
In addition to the lamps outlined in the side lamps and headlamp dipped beam sections, the LCM will provide feeds to the following lamps if it detects that headlamp main beam has been selected:
- To the RH headlamp bi-xenon unit (C0011) on a WU and a WB wire
- To the LH headlamp bi-xenon unit (C0009) on a YG and a WB wire.

Both are earthed on N wires.

Diagnostic Socket
The bi-xenon headlamp system can be interrogated using TestBook or T4 via the diagnostic socket. The diagnostic socket (C0040) is connected to the RH (C0011) and LH (C0009) bi-xenon units via a pair of WP wires.
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