Open in Bus 1 Main Bus Line [10/2018 - 08/2021]: Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus UX 250h, 2023 Lexus UX 250h, 2022 Lexus UX 250h, 2021 Lexus UX 250h, and 2020 Lexus UX 250h. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 2 CAN JUNCTION CONNECTOR)

Disconnect the cable from the negative (-) auxiliary battery terminal.
Disconnect the No. 2 CAN junction connector.

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to No. 2 CAN Junction Connector)	*b	to No. 8 CAN Junction Connector
*c	to Central Gateway ECU (Network Gateway ECU)	-	-

Standard Resistance

Tester Connection	Condition	Specified Condition	Connected to
F86-1 (CANH) - F86-7 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	No. 8 CAN Junction Connector
F86-2 (CANH) - F86-8 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	Central Gateway ECU (Network Gateway ECU)

Result

Result	Proceed to
OK	A
NG (Line to central gateway ECU (network gateway ECU))	B
NG (Line to No. 8 CAN junction connector)	C

Result:

REPLACE NO. 2 CAN JUNCTION CONNECTOR

Result:

See step 3

Result:

See step 2

CHECK FOR OPEN IN CAN MAIN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 2 CAN JUNCTION CONNECTOR)

Reconnect the F86 No. 2 CAN junction connector.
Disconnect the central gateway ECU (network gateway ECU) connector.

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to Central Gateway ECU (Network Gateway ECU))

Standard Resistance

Tester Connection	Condition	Specified Condition
F61-23 (CA1H) - F61-8 (CA1L)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

Result

Proceed to
OK
NG

Result:

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU). Refer to REMOVAL [10/2018 - 07/2022]

Result:

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 2 CAN JUNCTION CONNECTOR)

CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 8 CAN JUNCTION CONNECTOR)

Reconnect the F86 No. 2 CAN junction connector.
Disconnect the No. 8 CAN junction connector.

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to No. 8 CAN Junction Connector)	*b	to No. 2 CAN Junction Connector
*c	to No. 2 CAN Junction Terminal	-	-

Standard Resistance

Tester Connection	Condition	Specified Condition	Connected to
N111-1 (CANH) - N111-7 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	No. 2 CAN Junction Connector
N111-6 (CANH) - N111-12 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	No. 2 CAN Junction Terminal

Result

Result	Proceed to
OK	A
NG (Line to No. 2 CAN junction connector)	B
NG (Line to No. 2 CAN junction terminal)	C

Result:

REPLACE NO. 8 CAN JUNCTION CONNECTOR

Result:

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - NO. 8 CAN JUNCTION CONNECTOR)

Result:

See step 4

CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 2 CAN JUNCTION TERMINAL)

Reconnect the N111 No. 8 CAN junction connector.
Disconnect the No. 2 CAN junction terminal connector.

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

*a	Front view of wire harness connector (to No. 2 CAN Junction Terminal)

Standard Resistance

Tester Connection	Condition	Specified Condition
N96-3 (P) - N96-2 (N)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

Result

Proceed to
OK
NG

Result:

REPLACE NO. 2 CAN JUNCTION TERMINAL

Result:

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 2 CAN JUNCTION TERMINAL - NO. 8 CAN JUNCTION CONNECTOR)