Battery ECU Communication Stop Mode [11/2021 - ]: Procedure
WARNING: This page is about a different car, the 2025 Lexus NX 350h, 2024 Lexus NX 350h, 2023 Lexus NX 350h, and 2022 Lexus NX 350h. 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 z14 battery ECU assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition z14-29 (CA2H) - z14-28 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (BATTERY ECU ASSEMBLY)
Result:
OK
See step 2
- CHECK BATTERY ECU ASSEMBLY POWER SOURCE CIRCUIT
- Check the battery ECU assembly power source circuit.
Refer to ECU Power Source Circuit [11/2021 - ]
Result
Result OK NG
Result:
OK
REPLACE BATTERY ECU ASSEMBLY. Refer to REMOVAL [11/2021 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
- Check the battery ECU assembly power source circuit.