AWD Warning does not Come ON [10/2022 - ]: Procedure
WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK HARNESS AND CONNECTOR
- Check that there is no looseness at the locking and connecting parts of the 4WD ECU assembly connector.
OK
No looseness at the locking and connecting parts
- Disconnect the H14 and H15 4WD ECU assembly connectors.
- Check the connector case and the terminal for deformation and corrosion.
OK
No deformation or corrosion
- Connect the H14 and H15 4WD ECU assembly connectors.
Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 2
- Check that there is no looseness at the locking and connecting parts of the 4WD ECU assembly connector.
- CHECK AWD WARNING MESSAGE
- According to the display on the GTS, perform the Active Test and check the Data List "AWD Warning Light" turns ON/OFF.
Chassis > Four Wheel Drive > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note 4WD Warning Light AWD warning (multi-information display) OFF / ON OFF: Warning off
ON: Warning on- Chassis > Four Wheel Drive > Active Test
Tester Display Measurement Item Control Range Diagnostic Note 4WD Warning Light AWD warning (multi-information display) Warning ON/OFF Observe combination meter assembly Chassis > Four Wheel Drive > Active Test
Active Test Display 4WD Warning Light Data List Display 4WD Warning Light Result
Result Proceed to Data List display does not switch ON/OFF A Data List display switches ON/OFF B
Result:
A
REPLACE 4WD ECU ASSEMBLY. Refer to REMOVAL [10/2022 - ]
Result:
B
GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ]
- According to the display on the GTS, perform the Active Test and check the Data List "AWD Warning Light" turns ON/OFF.