Illumination Circuit

LIGHTING: LIGHTING SYSTEM: Illumination Circuit

Illumination Circuit

DESCRIPTION

The main body ECU receives information regarding the door courtesy switch and door lock position switch, and turns on the room light assembly.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FUSE (DOME)
(a) Remove the DOME fuse from the engine room relay block.
(b) Measure the resistance.
Standard resistance:
Below 1 Ohms
(c) Reinstall the DOME fuse.
NG -- REPLACE FUSE
OK -- Continue to next step.
2. INSPECT ROOM LIGHT ASSEMBLY




(a) Inspect the room light assembly.
(1) Remove the room light assembly.
(2) Measure the resistance.
Standard resistance:






(3) Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 2, then check that the light comes on when the switch is in the DOOR position.
OK:
Light comes on.
(4) Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 3, then check that the light comes on when the switch is in the ON position.
OK:
Light comes on.
(5) Reinstall the room light assembly.
NG -- REPLACE ROOM LIGHT ASSEMBLY
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (BATTERY - ROOM LIGHT ASSEMBLY AND MAIN BODY ECU)




(a) Disconnect the 4K main body ECU connector.
(b) Measure the voltage.
Standard voltage:





(c) Reconnect the main body ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE