Illumination of the front and rear interior lamps is controlled by the door switches. When any of the side doors are opened, both lamps will illuminate. The lamps will extinguish when all side doors are closed. The interior lamps can be switched on or off manually by moving the three position switch located on the lamp assembly to the required position.
Operation
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fusible link 1 of the under seat fuse box (C0632) on an N wire. Fusible link 1 is connected in series with fusible link 2, which is also located in the under seat fuse box. Fusible link 2 (C0570) is connected to fuse 30 of the passenger compartment fuse box (C0595) by an NK wire. Fuse 30 (C0595) provides a constant battery feed to the following on PN wires:
- The front interior lamp (C0355)
- The rear interior lamp (C0356) – 90 models only
- The rear interior lamp (C0357) – 110 models only.
Front Interior Lamp
With the lamp switch in the central position, current flows across the bulb and switch contacts (C0355) to the following:
- To the RH front door switch (C0265) on a PW wire
- To the LH front door switch (C0106) on a PW wire
- To the RH rear door switch (C0108) on a PW then PU wire
- To the LH rear door switch (C0104) on a PW then PU wire.
When any of the doors are opened, the relevant door switch contacts close creating an earth path for the lamp.
With the lamp switch in the 'On' position, current flows across the bulb and switch contacts (C1210) to earth on a B wire.
With the lamp switch in the 'Off' position, current cannot flow across the open switch contacts.
Rear Interior Lamp – 90
Models With the lamp switch in the central position, current flows across the bulb and switch contacts (C0356) to the following:
- To the RH front door switch (C0265) on a PW wire
- To the LH front door switch (C0106) on a PW wire
- To the RH rear door switch (C0108) on a PW then PU wire
- To the LH rear door switch (C0104) on a PW then PU wire.
When any of the doors are opened, the relevant door switch contacts close creating an earth path for the lamp.
With the lamp switch in the 'On' position, current flows across the bulb and switch contacts (C1209) to earth on a B wire.
With the lamp switch in the 'Off' position, current cannot flow across the open switch contacts.
Rear Interior Lamp – 110
Models With the lamp switch in the central position, current flows across the bulb and switch contacts (C0357) to the following:
- To the RH front door switch (C0265) on a PW wire
- To the LH front door switch (C0106) on a PW wire
- To the RH rear door switch (C0108) on a PW then PU wire
- To the LH rear door switch (C0104) on a PW then PU wire.
When any of the doors are opened, the relevant door switch contacts close creating an earth path for the lamp.
With the lamp switch in the 'On' position, current flows across the bulb and switch contacts (C1991) to earth on a B wire.
With the lamp switch in the 'Off' position, current cannot flow across the open switch contacts.