ACC Low Pressure (X21A9) [11/2021 - ]: Procedure
WARNING: This page is about a different car, the 2025 Lexus NX 350h, 2024 Lexus NX 350h, 2023 Lexus NX 350h, and 2022 Lexus NX 350h. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK DTC (HEALTH CHECK)
- Perform the Health Check using the GTS.
Result
Result Proceed to DTCs are not output. A DTCs are output. B
Result:
B
GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2021 - 03/2024] , or refer to DIAGNOSTIC TROUBLE CODE CHART [03/2024 - ]
Result:
A
See step 2
- Perform the Health Check using the GTS.
- CLEAR VEHICLE CONTROL HISTORY (RoB)
- Using the GTS, clear the Vehicle Control History (RoB).
Chassis > Brake Booster > Utility
Tester Display Vehicle Control History (RoB) Result
Proceed to NEXT
Result:
NEXT
See step 3
- Using the GTS, clear the Vehicle Control History (RoB).
- CHECK VEHICLE CONTROL HISTORY (RoB)
- Based on the Freeze Frame Data and interview with the customer, attempt to reproduce the conditions when the malfunction occurred.
- Using the GTS, check for Vehicle Control History (RoB).
Chassis > Brake Booster > Utility
Tester Display Vehicle Control History (RoB) Result
Result Proceed to X21A9 is not output. A X21A9 is output. B
Result:
A
END
Result:
B
GO TO BRAKE SYSTEM ON-VEHICLE INSPECTION. Refer to PROCEDURE - Step 4