DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK PERSONAL LIGHT (OPERATION)
PERFORM ACTIVE TEST BY INTELLIGENT TESTER
INSPECT REAR DOME LIGHT ASSEMBLY (REAR SEAT ILLUMINATION)
CHECK HARNESS AND CONNECTOR (OVERHEAD J/B - REAR DOME LIGHT ASSEMBLY)
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - OVERHEAD J/B)
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - OVERHEAD J/B)
CHECK HARNESS AND CONNECTOR (POWER SOURCE)
LIGHTING SYSTEM - Seat Illumination Circuit
DESCRIPTION
The seat illumination can be canceled using the overhead J/B switch.
The turning on and off of the seat illumination is controlled by the main body ECU LH based on various signals received through BEAN communication.
The main body ECU LH includes a MOS-FET (Metal Oxide Semiconductor - Field Effect Transistor) circuit that fades the seat illumination in and out by duty control.
This MOS-FET circuit has an overheat protection function as a fail-safe. If the main body ECU LH becomes excessively hot, the seat illumination turns off and remains off.
Normal operation will resume when the conditions required to turn on the seat illumination are met again.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.CHECK PERSONAL LIGHT (OPERATION) |
- The personal lights and seat illumination share the same power source circuit. Therefore, if none of them come on, inspect the power source circuit first.
Push the personal light switches.
Check that the personal lights come on.
- OK:
- Personal lights come on.
| 2.PERFORM ACTIVE TEST BY INTELLIGENT TESTER |
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the intelligent tester main switch on.
Select the item(s) below in the ACTIVE TEST, and check the operation.
ACTIVE TEST: Body No. 3 (Main Body ECU LH)| Item | Test Details | Diagnostic Note |
| Interior Light (Dim) Operation | Front and rear seat illumination ON / OFF | - |
- OK:
- Front and rear seat illumination comes on.
- Result:
| Result | Proceed to |
| Front seat illumination does not come on | A |
| Rear seat illumination does not come on | B |
| Neither front nor rear seat illumination comes on | C |
| OK | D |
- If the rear seat illumination comes on normally, but the front seat illumination does not come on, there is an open circuit in the overhead J/B.
| D | |
| |
| PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 3.INSPECT REAR DOME LIGHT ASSEMBLY (REAR SEAT ILLUMINATION) |
Remove the rear dome light assembly.
Connect the (+) lead from the battery to terminal 2 and the (-) lead to terminal 5, and then check that the seat illumination comes on.
- OK:
- Seat illumination comes on.
| OK | |
| |
| REPLACE MAIN BODY ECU LH (COWL SIDE J/B LH) |
|
| 6.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - OVERHEAD J/B) |
Disconnect the Q3 main body ECU LH connector.
Disconnect the R5 overhead J/B connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Condition |
| Q3-3 (LGCY) - R5-12 (CTY) | Always | Below 1 Ω |
| Q3-3 (LGCY) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 7.CHECK HARNESS AND CONNECTOR (POWER SOURCE) |
Disconnect the R5 overhead J/B connector.
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
| Tester Connection | Condition | Specified Condition |
| R5-1 (+B1) - Body ground | Always | 10 to 14 V |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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