Lighting System Room Light Circuit
Lighting. Lexus Gs430, Gs300. Uzs190 Grs190
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
PERFORM ACTIVE TEST BY INTELLIGENT TESTER
CHECK WIRE HARNESS (COWL SIDE JUNCTION BLOCK ECU LH - MAP LIGHT ASSEMBLY)
INSPECT FUSE (DOME, D/C CUT)
CHECK WIRE HARNESS (MAP LIGHT ASSEMBLY - BATTERY)
CHECK WIRE HARNESS (MAP LIGHT ASSEMBLY - BODY GROUND)
CHECK WIRE HARNESS (MAP LIGHT ASSEMBLY - ROOM LIGHT)
REPLACE ROOM LIGHT
LIGHTING SYSTEM - Room Light Circuit |
DESCRIPTION
The cowl side junction block ECU LH receives information regarding the door courtesy switch, door lock position switch, engine switch, and turns on the front room light.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.PERFORM ACTIVE TEST BY INTELLIGENT TESTER |
Select the Active Test, use the intelligent tester to generate a control command, and then check that the room light illuminates.
- Cowl side junction block ECU LH:
Item
| Test Details
| Diagnostic Note
|
Seat Light operation
| Seat light operation ON / OFF
| -
|
Shift Light operation
| Shift light operation ON / OFF
| -
|
| OK |
|
|
|
| PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 2.CHECK WIRE HARNESS (COWL SIDE JUNCTION BLOCK ECU LH - MAP LIGHT ASSEMBLY) |
Disconnect the W1 junction block connector.
Disconnect the Y6 overhead junction block connector.
Measure the resistance of the wire harness side connectors.
- Standard resistance:
Tester Connection
| Specified Condition
|
W1-3 (RCTY) - Y6-27 (SHFT)
| Below 1 Ω
|
W1-2 (ILE) - Y6-30 (CTY)
| Below 1 Ω
|
W1-3 (RCTY) or Y6-27 (SHFT) - Body ground
| 10 kΩ or higher
|
W1-2 (ILE) or Y6-30 (CTY) - Body ground
| 10 kΩ or higher
|
| | REPAIR OR REPLACE HARNESS AND CONNECTOR |
|
|
| 3.INSPECT FUSE (DOME, D/C CUT) |
Remove the DOME and D/C CUT fuses from the engine room No. 1 relay block.
Measure the resistance of the fuses.
- Standard resistance:
- Below 1 Ω
| 4.CHECK WIRE HARNESS (MAP LIGHT ASSEMBLY - BATTERY) |
Disconnect the Y6 map light connector.
Measure the voltage of the wire harness side connector.
- Standard voltage:
Tester Connection
| Specified Condition
|
Y6-1 (+B1) - Body ground
| 10 to 14 V
|
| | REPAIR OR REPLACE HARNESS AND CONNECTOR |
|
|
| 5.CHECK WIRE HARNESS (MAP LIGHT ASSEMBLY - BODY GROUND) |
Disconnect the Y6 map light connector.
Measure the resistance of the wire harness side connectors.
- Standard resistance:
Tester Connection
| Specified Condition
|
Y6-31 (GND3) - Body ground
| Below 1 Ω
|
| | REPAIR OR REPLACE HARNESS AND CONNECTOR |
|
|
| 6.CHECK WIRE HARNESS (MAP LIGHT ASSEMBLY - ROOM LIGHT) |
Disconnect the Y6 map light connector.
Disconnect the Y10 room light connector.
Measure the resistance of the wire harness side connectors.
- Standard resistance:
Tester Connection
| Specified Condition
|
Y6-32 (RGND) - Y10-6 (RGND)
| Below 1 Ω
|
Y6-8 (RLSW) - Y10-4 (RLSW)
| Below 1 Ω
|
Y6-25 (RRSW) - Y10-1 (RRSW)
| Below 1 Ω
|
Y6-7 (RLMP) - Y10-3 (RLMP)
| Below 1 Ω
|
Y6-24 (RRMP) - Y10-2 (RRMP)
| Below 1 Ω
|
Y6-23 (RILL) - Y10-7 (RILL)
| Below 1 Ω
|
Y6-22 (LILL) - Y10-8 (LILL)
| Below 1 Ω
|
Y6-6 (ILLB) - Y10-5 (ILLB)
| Below 1 Ω
|
Y6-32 (RGND) or Y10-6 (RGND) - Body ground
| 10 kΩ or higher
|
Y6-8 (RLSW) or Y10-4 (RLSW) - Body ground
| 10 kΩ or higher
|
Y6-25 (RRSW) or Y10-1 (RRSW) - Body ground
| 10 kΩ or higher
|
Y6-7 (RLMP) or Y10-3 (RLMP) - Body ground
| 10 kΩ or higher
|
Y6-24 (RRMP) or Y10-2 (RRMP) - Body ground
| 10 kΩ or higher
|
Y6-23 (RILL) or Y10-7 (RILL) - Body ground
| 10 kΩ or higher
|
Y6-22 (LILL) or Y10-8 (LILL) - Body ground
| 10 kΩ or higher
|
Y6-6 (ILLB) or Y10-5 (ILLB) - Body ground
| 10 kΩ or higher
|
| | REPAIR OR REPLACE HARNESS AND CONNECTOR |
|
|
Temporarily replace the room light with a new or normally functioning one.
Check that the light illuminates.
- OK:
- Room light illuminates.
| NG |
|
|
|
| PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
|
