Hybrid Vehicle Control ECU Communication Stop Mode [08/2020 - ]: 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 (HYBRID VEHICLE CONTROL ECU BRANCH LINE)

Disconnect the cable from the negative (-) auxiliary battery terminal.
Disconnect the G60 hybrid vehicle control ECU connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
G60-25 (CA1H) - G60-24 (CA1L)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω
G60-31 (CA3P) - G60-30 (CA3N)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to Hybrid Vehicle Control ECU)

Result

Result
OK
NG

Result:

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (HYBRID VEHICLE CONTROL ECU)

Result:

See step 2

CHECK ECU POWER SOURCE CIRCUIT

Check the ECU power source circuit.

for Nickel Metal Hydride Battery
Refer to ECU Power Source Circuit [06/2018 - ]
for Lithium-ion Battery
Refer to ECU Power Source Circuit [08/2020 - ]

Result

Result
OK
NG

Result:

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to REMOVAL [06/2018 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)