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Courtesy Lamp: Description and Operation




INTERIOR LAMPS

DESCRIPTION

General
Operation of the interior lamps is controlled by the Body Control Unit (BCU) which is located beneath the front passenger seat.

The interior lamps have two modes of operation; automatic or manual. In the automatic mode the interior lamp functionality is controlled by the BCU on receipt of various input signals. In manual mode, the lamps can be switched on and off using the non-latching switch adjacent to the front interior lamp, or can be disabled completely using the same switch.

OPERATION

Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fuse 17, fuse 27 and fuse 53 of the passenger compartment fuse box (C0632) on an R wire. Fuse 17 is connected to the door lamp module, which is also located in the passenger compartment fuse box.

Fuse 27 (C0582) provides a constant battery feed to the Body Control Unit (BCU) (C0662) on an RP 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 42 of the passenger compartment fuse box (C0585) on a PB wire. Fuse 42 (C0586) provides an auxiliary ignition feed to the RH (C0736) and LH (C0737) vanity mirrors on a pair of PS wires.

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 provides an ignition feed to the door lamp module, which is also located in the passenger compartment fuse box.

Body Control Unit (BCU)
The BCU (C0662) monitors the condition of all four doors and provides feeds to the following lamps via the passenger compartment fuse box on RU wires if any are opened:
- The RH front footwell lamp (C0076)
- The LH front footwell lamp (C0077)
- The RH front sill lamp (C1794)
- The LH front sill lamp (C1795)
- The LH rear puddle lamp (C2212)
- The RH front puddle lamp (C2211)
- The RH rear puddle lamp (C2212)
- The LH front puddle lamp (C2210)
- The front interior lamp (C0355)
- The rear interior lamp (C0357).

All are earthed on N wires.


NOTE: The LH rear and RH rear puddle lamps have the same connector number as they utilise the same harness.


Approach Lamps
When the BCU receives a valid unlocking signal from the remote handset, it will illuminate the approach lamps via the door lamp module. The door lamp module (C0587) is located in the passenger compartment fuse box and provides a feed to the LH (C2291) and RH (C2291) approach lamps on a pair of RG then K wires. Both lamps are earthed on Y then N wires.


NOTE: The LH and RH approach lamps have the same connector numbers they utilise the same harness.


Luggage Compartment Lamps
The BCU (C0662) provides a feed to the LH (C0120) and RH (C0119) upper tail door lamps, and the luggage Compartment lamp (C2047) on RY wires. The earth path for the lamps is controlled by the tail door tail door motor (C0383).

Map Reading Lamps
The front and rear interior lamps both contain 2 map reading lamps. The BCU (C0662) provides a feed to the front (C0355) and rear (C0357) map reading lamps on a pair of RY wires. When any of the map reading lamp switches are pressed, the switch contacts close allowing current to flow to earth on an N wire to illuminate the lamp.

Glove Box Lamp
The BCU (C0662) monitors the condition of the glove box switch (C0227) by providing afeed on a RY wire. When the glove box is opened, the switch contacts close creating a path to earth on an N wire.

Automatic Mode
When the interior lamps are in automatic mode and any of the doors are opened, the BCU (C0662) provides a feed to all the interior lamps listed in the Body Control Unit (BCU) section previously. Current flows across the lamps to earth on N wires. When all the doors are closed, the BCU withdraws the feed to the interior lamps.

Manual Mode
When the switch located on the front interior lamp is pressed to enter the manual 'continuously on' mode, current flows across the front interior lamp to the BCU (C0660) on a WN wire. Sensing this, the BCU illuminates all the interior lamps listed in the Body Control Unit (BCU) section irrespective of door status.