ECM Communication Stop Mode [08/2023 - ]: 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 FOR OPEN IN CAN BUS LINES (ECM MAIN LINE)
- Disconnect the cable from the negative (-) battery terminal.
- Disconnect the A16 ECM connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition A16-26 (CANH) - A16-25 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (ECM)
Result:
OK
See step 2
- CHECK ECM POWER SOURCE CIRCUIT
- Check the ECM power source circuit.
Refer to ECM Power Source Circuit [10/2022 - ]
Result
Proceed to OK NG
Result:
OK
REPLACE ECM. Refer to REMOVAL [10/2022 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
- Check the ECM power source circuit.