Tire Pressure Monitor ECU Communication Stop Mode [10/2022 - ]: Procedure
WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 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 H110 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 H110-9 (CANH) - H110-10 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER)
Result:
OK
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 H110-12 (GND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
Result:
OK
See step 3
- Measure the resistance according to the value(s) in the table below.
- 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 H110-1 (IG) - Body ground Ignition switch ON 10.5 to 16 V H110-7 (+B) - Body ground Ignition switch ON 10.5 to 16 V Result
Proceed to OK NG
Result:
OK
REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER. Refer to REMOVAL [10/2022 - 08/2023] , or refer to REMOVAL [08/2023 - ]
Result:
NG
GO TO STOP AND START SYSTEM (FOR BACKUP BOOST CONVERTER CIRCUIT). Refer to Backup Boost Converter Circuit [10/2022 - ]