General
Operation of the interior illumination LED's and lamps is controlled by the Light Check Module (LCM). The LCM is located at the base of the RH 'A' post, and powers the LED's and lamps when the ignition switch is in either the auxiliary or ignition position, and the lighting switch is in either the side or headlamp position.
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fusible link 3, fusible link 4, and fuse 53 of the passenger compartment fuse box (C0632) on an R wire. Fusible link 3 (C0589) and fusible link 4 (C0590) provide constant battery feeds to the LCM on R wires.
Fuse (C0583) provides a constant battery feed to the ignition switch (C0099 on Td6 vehicles, C0028 on V8 vehicles) on an R wire. When the ignition switch is turned to the 'auxiliary' position, current flows across the switch (C0099 on Td6 vehicles, 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 (C0099 on Td6 vehicles, 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.
Lighting Switch
The LCM (C2040) monitors the condition of the fascia mounted rotary lighting switch (C0041) by providing a feed on an NB wire. When the lighting switch is turned to the side lamp position, it returns a feed to the LCM (C2040) on a Y wire. When the lighting switch is turned to the headlamp position, it returns a feed to the LCM (C2040) on a B wire.