Featured TPMS Tip: 2015-19 Lexus RC F, 2016-17 RC 200T, 2016-19 RC 300 and 2015-1 RC 350
Mitchell 1 provides TPMS information to Modern Tire Dealer, an award-winning publication that writes editorial content geared to independent tire dealers. We’re sharing this content in our blog, with a link to the Modern Tire Dealer website where you can read the article in full. The TPMS information in this article may also be accessed in either the TPMS or the reset procedures quick link in our ProDemand® auto repair information software, along with other important reset procedure data for the selected vehicle.
SUBJECT VEHICLES: Lexus RC F 2015-19, RC 200T 2016-17, RC 300 2016-19 and RC 350 2015-19.
SPECIAL TOOLS NEEDED? A Toyota Techstream must be used.
The tire pressure monitoring system (TPMS) in Toyota’s luxury line of Lexus vehicles is designed to provide warning when tire inflation pressure of one or more tires (including the spare tire) is low. A tire pressure monitoring valve sub-assembly equipped with a tire pressure sensor/transmitter is installed in each tire and wheel assembly.
The sensor measures the tire pressure and transmits the measured value and transmitter ID to the tire pressure monitoring receiver assembly on the body as radio waves, which are then sent to the tire pressure monitor engine control unit (ECU). If the transmitter ID has already been registered, the ECU compares the measured tire pressure value and the warning threshold pressure value.
When the value is less than the warning threshold pressure value registered in the tire pressure monitor ECU, the tire pressure warning light on the instrument cluster will turn on.
TIRE PRESSURE MONITOR WARNING LIGHT
NOTE: The tire pressure warning light may turn on due to natural causes such as natural air leaks or tire pressure changes caused by temperature. In this case, adjusting the tire pressure will turn off the warning light.
When the tire pressure warning light does not go off, or when it comes on during driving, check tire pressure (including spare tire) and adjust as necessary. The warning light should turn off a few minutes after air is put into a deflated tire. If the tire pressure warning light comes on after blinking for 1 minute frequently when the engine switch is turned to the “ON” position, there is a malfunction in the TPMS. See the appropriate manufacturer service information.
The spare tire is also equipped with the tire pressure warning valve and transmitter. The tire pressure warning light will turn on if the tire inflation pressure of the spare tire is low. If a tire goes flat, even though the flat tire is replaced with the spare tire, the tire pressure warning light does not turn off. Replace the spare tire with the repaired tire and adjust the proper tire inflation pressure. The tire pressure warning light will turn off after a few minutes.
TPMS RESET PROCEDURES
NOTE: If the tire pressure sensor and/or tire pressure monitor ECU are replaced, the transmitter ID needs to be registered in the tire pressure monitor ECU.
TIRE PRESSURE SENSOR REGISTRATION
NOTE: When a tire pressure sensor and/or tire pressure monitor ECU are replaced, all the tire sensors must be registered. To perform this procedure, a Toyota Techstream must be used.
NOTE: Initialization can be confirmed through the tire pressure warning light.
- The order in which the data is received is random. If the signals from all the tire pressure warning valve and transmitters are received, initialization is completed.
- Initialization is completed when the Data List “ID Tire Inflation Pressure” display shows the correct pressures.
- It may take a few minutes until the values are displayed. If the values are not displayed after a few minutes, perform troubleshooting according to the inspection procedure for DTCs C2121/21 to C2124/24.
- If initialization has not been completed successfully, DTC C2177/77 is stored after a vehicle speed of 23 mph (37 km/h) or more is detected for 20 minutes or more.
- During test mode (sensor check mode), the system will not change to initialization mode even if the tire pressure warning reset switch is pushed.
- Initialization can be terminated by connecting terminals 13 (TC) and 4 (CG) of the DLC3 (see Figure 1).
Figure 1: Identifying the data link connector terminals.
1) Set the tire pressure to the specified value.
2) Turn the engine switch on (IG).
3) Press and hold the tire pressure warning reset switch for 3 seconds or more until the tire pressure warning light blinks 3 times (see Figure 2).
4) Turn the engine switch off.
5) Connect the Techstream to the DLC3.
6) Turn the engine switch on (IG) and turn the Techstream on.
7) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.
8) Check that initialization has been completed.
9) Confirm that the tire pressure data of all tires is displayed on the Techstream screen.
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