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.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Active Test.

(e) Check the operation.

Main Body (Main Body ECU)





OK:

Light comes on.

NG -- INSPECT FUSE (DOME)

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2. INSPECT FUSE (DOME)

(a) Remove the DOME fuse from the engine room No. 2 relay block.

(b) Measure the resistance of the fuse.

Standard resistance:

Below 1 Ohms

NG -- REPLACE FUSE
OK -- Continue to next step.

3. INSPECT ROOM LIGHT ASSEMBLY





(a) Remove the room light assembly.

(b) Measure the resistance of the room light switch base.

Standard resistance:





NG -- REPLACE ROOM LIGHT ASSEMBLY
OK -- Continue to next step.

4. INSPECT ROOM LIGHT BULB





(a) Remove the room light assembly.

(b) 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.

(c) 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.

NG -- REPLACE BULB
OK -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (BATTERY - ROOM LIGHT AND MAIN BODY ECU)





(a) Disconnect the IK instrument panel junction block connector.

(b) Measure the voltage of the wire harness side connector.

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

6. INSPECT MAP LIGHT BULB

(a) Remove the map light assembly.

(b) Connect the positive (+) lead from the battery to terminal 6 and the negative (-) lead to terminal 1, then check that the light comes on when the switch is in the DOOR position.





OK:

Light comes on.

(c) Connect the positive (+) lead from the battery to terminal 6 and the negative (-) lead to terminal 7, then check that the light comes on when the switch is in the ON position.





OK:

Light comes on.

Result





C -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK

B -- INSPECT IGNITION KEY CYLINDER LIGHT
A -- Continue to next step.

7. INSPECT MAP LIGHT





(a) Replace the map light bulb with a normally functioning one or a new one.

(b) Connect the positive (+) lead from the battery to terminal 6 and the negative (-) lead to terminal 1, then check that the light comes on when the switch is in the DOOR position.

OK:

Light comes on.

(c) Connect the positive (+) lead from the battery to terminal 6 and the negative (-) lead to terminal 7, then check that the light comes on when the switch is in the ON position.





OK:

Light comes on.

NG -- REPLACE MAP LIGHT ASSEMBLY

OK -- REPLACE MAP LIGHT BULB

8. INSPECT IGNITION KEY CYLINDER LIGHT

(a) Remove the transponder key amplifier (ignition key cylinder light).





(b) Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 6, then check that the light comes on.

OK:

Light comes on.

NG -- REPLACE IGNITION KEY CYLINDER LIGHT
OK -- Continue to next step.

9. CHECK WIRE HARNESS (BATTERY - MAIN BODY ECU)





(a) Disconnect the IE instrument panel junction block connector.

(b) Measure the voltage of the wire harness side connector.

:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR

OK -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK