Tire Pressure Monitor ECU Communication Stop Mode [11/2021 - ]: Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2025 Lexus NX 350, 2025 Lexus NX 250, 2024 Lexus NX 350, 2024 Lexus NX 250, and 2023 Lexus NX 350. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR OPEN IN CAN BUS LINES (TIRE PRESSURE WARNING ECU AND RECEIVER BRANCH LINE)

Disconnect the cable from the negative (-) battery terminal.
Disconnect the G90 tire pressure warning ECU and receiver connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
G90-9 (CANH) - G90-10 (CANL)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

Result

Result
OK
NG

Result:

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER)

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
G90-12 (GND) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

Result

Result
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

Result:

See step 3

CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

Reconnect the cable to the negative (-) battery terminal.

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

Standard Voltage

Tester Connection	Condition	Specified Condition
G90-1 (IG) - Body ground	Ignition switch ON	10.5 to 16 V
G90-7 (+B) - Body ground	Ignition switch ON	10.5 to 16 V

Result

Result
OK
NG

Result:

REPLACE PRESSURE WARNING ECU AND RECEIVER. Refer to REMOVAL [11/2021 - ]

Result:

GO TO STOP AND START SYSTEM (FOR BACKUP BOOST CONVERTER CIRCUIT). Refer to Backup Boost Converter Circuit [11/2021 - 03/2023] , or refer to Backup Boost Converter Circuit [03/2023 - ]