Battery ECU Communication Stop Mode [08/2020 - 08/2021]: Procedure
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, 2021 Lexus ES 300h, and 2020 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK FOR OPEN IN CAN BUS LINES (BATTERY ECU ASSEMBLY BRANCH LINE)
- Disconnect the cable from the negative (-) auxiliary battery terminal.
- Disconnect the y16 battery ECU assembly connector.
- Measure the resistance according to the value(s) in the table below.
*a Front view of wire harness connector
(to Battery ECU Assembly)Standard Resistance
Tester Connection Condition Specified Condition y16-29(CA2H) - y16-28(CA2L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω Result
Result OK NG
Result:
NG
REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (BATTERY ECU ASSEMBLY)
Result:
OK
See step 2
- CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
- Check the battery ECU assembly power source circuit.
Refer to ECU Power Source Circuit [06/2018 - ]
Result
Result OK NG
Result:
OK
REPLACE BATTERY ECU ASSEMBLY. Refer to REMOVAL [08/2020 - 08/2021]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
- Check the battery ECU assembly power source circuit.