DTC B2274-11: ACC Circuit Short to Ground [09/2023 - ]: Procedure
WARNING: This page is about a different car, the 2024 Lexus TX 550h+ and 2024 Lexus TX 500h. 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 D38 certification ECU (smart key ECU assembly) connector.
- Disconnect the D62 power distribution box assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition Result D38-21 (ACCD) - D62-38 Always Below 1 Ω Ω D62-36 - Body ground Always Below 1 Ω Ω D38-21 (ACCD) or D62-38 - Other terminals and body ground Always 10 kΩ or higher kΩ Result
Proceed to OK NG
Post-procedure1
- Connect the D38 certification ECU (smart key ECU assembly) connector.
- Connect the D62 power distribution box assembly connector.
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
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 Result D38-21 (ACCD) - Body ground Ignition switch off 1 V or less V D38-21 (ACCD) - Body ground Ignition switch ACC 8.5 V or higher V Result
Proceed to OK NG
Result:
OK
REPLACE POWER DISTRIBUTION BOX ASSEMBLY. Refer to REMOVAL [09/2023 - ]
Result:
NG
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to REMOVAL [09/2023 - 12/2023] , or refer to REMOVAL [12/2023 - ]
- Measure the voltage according to the value(s) in the table below.