Certification ECU Communication Stop Mode [11/2018 - ]: Procedure

CHECK FOR OPEN IN CAN BUS WIRE (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] BRANCH WIRE)

Disconnect the certification ECU (smart key ECU assembly) connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to Certification ECU [Smart Key ECU Assembly])

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

Standard Resistance

Tester Connection	Condition	Specified Condition
G54-1 (CANH) - G54-2 (CANL)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR

Result:

See step 2

CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

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

Standard Resistance

Tester Connection	Condition	Specified Condition
G54-18 (E) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to Certification ECU [Smart Key ECU Assembly])

Reconnect the cable to the negative (-) battery terminal.
NOTE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

Refer to INITIALIZATION [11/2018 - 02/2019] , or refer to INITIALIZATION [02/2019 - 10/2019] , or refer to INITIALIZATION [10/2019 - 06/2020] , or refer to INITIALIZATION [06/2020 - 08/2020] , or refer to INITIALIZATION [08/2020 - 12/2021] , or refer to INITIALIZATION [12/2021 - 10/2022] , or refer to INITIALIZATION [10/2022 - 10/2023] , or refer to INITIALIZATION [10/2023 - ]

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

Standard Voltage

Tester Connection	Condition	Specified Condition
G54-4 (+B) - Body ground	Always	11 to 14 V
G54-15 (CUTB) - Body ground	Always	11 to 14 V

Result

Proceed to
OK
NG

Result:

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR