DTC B2274: ACC Monitor Malfunction [08/2019 - ]: Procedure
WARNING: This page is about a different car, the 2022 Toyota Sequoia, 2021 Toyota Sequoia, and 2020 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) AND BODY GROUND)
- Disconnect the 3J and 3I cowl side junction block LH connectors.
- Disconnect the H199 certification ECU (smart key ECU assembly) connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition H199-9 (ACCD) - 3J-30 Always Below 1 Ω 3I-3 - Body ground Always Below 1 Ω H199-9 (ACCD) or 3J-30 - Other terminals and body ground Always 10 kΩ or higher Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 2
- CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
- Reconnect the certification ECU (smart key ECU assembly) connector.
*a Component with harness connected
(Certification ECU (Smart Key ECU Assembly)) - Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Switch Condition Specified Condition H199-9 (ACCD) - Body ground Engine switch off → Engine switch on (ACC) 1 V or less → 8.5 V or higher Result
Proceed to OK NG
Result:
OK
REPLACE COWL SIDE JUNCTION BLOCK LH. Refer to REMOVAL [08/2019 - ]
Result:
NG
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to REMOVAL [08/2019 - ]
- Reconnect the certification ECU (smart key ECU assembly) connector.