DTC B2274-11: ACC Circuit Short to Ground [11/2021 - ]: Procedure
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2025 Lexus NX 350, 2025 Lexus NX 250, 2024 Lexus NX 350, 2024 Lexus NX 250, and 2023 Lexus NX 350. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - POWER DISTRIBUTION BOX ASSEMBLY - BODY GROUND)
Pre-procedure1
- Disconnect the D58 certification ECU (smart key ECU assembly) connector.
- Disconnect the 9B power distribution box assembly connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition D58-21 (ACCD) - 9B-38 Always Below 1 Ω 9B-36 - Body ground Always Below 1 Ω D58-21 (ACCD) or 9B-38 - Other terminals and body ground Always 10 kΩ or higher Result
Proceed to OK NG Post-procedure1
- None
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR. Refer to REMOVAL [11/2021 - ]
Result:
OK
See step 2
- CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
- Measure the voltage according to the value(s) in the table below.
*a Component with harness connected
(Certification ECU (Smart Key ECU Assembly))Standard Voltage
Tester Connection Condition Specified Condition D58-21 (ACCD) - Body ground Ignition switch off 1 V or less D58-21 (ACCD) - Body ground Ignition switch ACC 8.5 V or higher Result
Proceed to OK NG
Result:
OK
REPLACE POWER DISTRIBUTION BOX ASSEMBLY. Refer to REMOVAL [11/2021 - ]
Result:
NG
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to REMOVAL [11/2021 - ]
- Measure the voltage according to the value(s) in the table below.