Lexus GS: rotate, replace, initialize
SUBJECT VEHICLE: 2006-11 Lexus GS Series.
RELEARN PROCEDURE? Yes.
SPECIAL TOOLS NEEDED? Yes. If the tire pressure sensor and/or tire pressure monitor ECU are replaced, the transmitter ID needs to be registered using the Toyota intelligent tester or Techstream.
The tire pressure monitoring system (TPMS) on the 2006-11 Lexus GS Series has a TPMS valve sub-assembly (equipped with a tire pressure sensor and a transmitter) installed in each tire and wheel assembly. A tire pressure warning selector switch is located at the base of the instrument panel on the passenger’s side (see Figure 2). The system allows two sets of ID codes to be registered. The code of the tires originally installed on the vehicle is registered on the switch at “MAIN.” When a new set of tires is installed, the tires can be registered in the “2nd” position.
NOTE: The system will need to be initialized when tires are rotated; tires are replaced with tires of different pressures; tire pressure sensor and/or tire pressure monitor ECU are replaced. Set tire pressure within the specified range before initializing. See Initializing TPMS. When a tire pressure sensor and/or tire pressure monitor ECU is replaced, the sensor ID must be memorized by the tire pressure monitor ECU prior to system initialization.
1. Set the tire pressure of all wheels to the pressure specified on the tire and loading information label.
2. With the vehicle stopped and parking brake applied, turn the engine switch on (IG). NOTE: Do not turn the engine off during initialization (the initialization process takes about 20 minutes). Initialization will be complete if signals are received from all four wheels. Initialization will be canceled if the engine switch is turned off during initialization.
3. Press and hold the tire pressure warning reset switch until the tire pressure warning light blinks three times at one-second intervals and “PRESSURE INITIAL” is shown on the multi-information display. See Figure 1.
4. Confirm initialization is complete using the intelligent tester or Techstream. Check that the pressure for each tire is displayed in “INIT THRESHOLD 1 to 4.”
Register transmitter ID
1. Set the tire pressure of all wheels to a pressure specified on the tire and loading information label.
2. Connect the intelligent tester or Techstream to DLC3 (located under the steering column).
3. With the parking brake applied, turn the engine switch on (IG).
4. Read and record the transmitter IDs (ID1 to ID4) by using the DATA LIST.
5. Select the “REGIST TIRE” mode.
6. Select the “MAIN” registration mode (or select “2nd” when registering in second). See Figure 2.
7. Input the transmitter IDs (ID1 to ID4) using the intelligent tester or Techstream and transmit it to the tire pressure monitor ECU.
8. Set the ID transmission condition to “SUCCEEDED.”
9. Disconnect the intelligent tester or Techstream with the engine switch in the “Off” position.
Confirm transmitter ID registration
1. Set the tire pressure of all wheels to the specified value.
2. Connect the intelligent tester or the Techstream to the DLC3.
3. With the vehicle stopped and the parking brake applied, turn the engine switch on (IG).
4. Select the “SIGNAL CHECK” mode on the intelligent tester or Techstream.
5. Forcibly transmit the transmitter IDs for all wheels by rapidly reducing tire air pressure (above 20 kPa/15 sec.). When rapidly reducing the pressure, remove the valve core. Perform this step to all tires.
6. Check that test mode DTCs C2181/81, C2182/82, C2183/83 and C2184/84 are all erased. The transmitter ID registration is complete when the test mode DTCs are erased. If they haven’t been erased, reset the tire pressure to the specified value and rotate the tire 90 to 270 degrees. Then forcibly transmit the transmitter IDs of all wheels. If they are still output, register the transmitter IDs.
7. Set the tire pressure of all wheels to the specified value.
Next you must determine the installed wheel’s transmitter ID status (“MAIN” or “2nd”) (except 2007 GS 430 and 2008 GS 460).
1. With the vehicle stopped and parking brake applied, turn the engine switch on (IG). NOTE: The tire pressure warning selector switch is located at the base of the instrument panel on the passenger’s side.
2. Set the tire pressure warning selector switch to the “MAIN” position. See Figure 2.
3. Set the tire pressure of all wheels to the specified value.
4. Rapidly reduce the pressure of any tire to 17 psi (120 kPa).
5. Check for the following items. If both of them are true, the transmitter ID of the currently installed wheel is registered in the “MAIN.”
• The tire pressure warning light comes on.
• The tire pressure of any tire is 17 psi (120 kPa) when measured with the intelligent tester or Techstream.
6. If either of the above conditions is not true, switch the tire pressure warning selector switch to “2nd.” Perform steps 3-5. If both conditions are now true, the transmitter ID of the currently installed wheel is registered in “2nd.”
CAUTION: Do not try to install a tire pressure sensor in a steel wheel or aftermarket wheel. Use only in original style factory wheels. CAUTION: The use of tire sealants is strictly prohibited for vehicles equipped with TPMS. Tire sealants can clog tire pressure sensors.
1. When replacing a wheel or tire, tire pressure sensors must be set up in one of the following ways:
• Remove the sensor from the old wheel and install it to the new wheel.
• Keep the same wheel with the sensor; replace only the tire.
• Use a new wheel and sensor (the new sensor must be registered after installation).
2. Remove wheel. Remove the valve core and cap, and release air from the tire. NOTE: Keep the removed cap, valve core, nut and washer.
3. After ensuring that air is sufficiently released, remove the nut and washer that is used to fix the tire pressure monitor valve sub-assembly and drop the sensor inside the tire. NOTE: Be careful not to damage the tire pressure monitor valve sub-assembly due to interference between the sensor and tire bead.
4. After dropping the tire pressure monitor valve sub-assembly into the tire, disengage the bead using the shoe of the tire remover. See Figure 3.
5. Remove the bead on the upper side in the usual operation.
6. Take out the sensor from the tire, and remove the bead on the lower side as in usual operation. NOTE: Check that no cracks or damage is identified on the grommet. If so, replace the grommet together with the washer and nut. NOTE: The tire pressure sensor is powered by a lithium battery. When disposing of the sensor, remove the battery and dispose of properly.
7. Remove the inner grommet from the tire pressure monitor valve subassembly.
1. Insert the tire pressure monitor valve into the valve installation hole. Insert from the inside of the rim so that the print surface can be seen. Check for the following:
• No visible deformation, damage or other abnormalities on the transmitter.
• No foreign matter on the inner grommet and around the rim hole.
• If installed in the reverse direction, the tire pressure monitor valve may be damaged or fail to transmit signals when running at high speed.
• If installing a new tire pressure monitor valve, write down the ID number before installation. It is necessary to register an ID in the ECU after installation.
2. Install the washer on the tire pressure monitor valve from the rim side (see Figure 4), and tighten the nut to 35 in.-lbs. (4 N.m). Check for the following:
• Ensure there is no foreign matter on the washer and nut.
• If the tire pressure monitor valve was removed, check that there is no damage or cuts, and no foreign matter such as mud, dirt or sand attached to the grommet. Replace the grommet with a new one if any of these defects are found.
• Check that there is no oil, water or lubricant around the rim hole, tire pressure monitor valve, washer and nut. Failing to do so may result in improper installation.
3. After the tire is inflated, the valve nut may be loose. Retighten the nut to the specified torque, and then check for air leaks with soapy water. CAUTION: If the sensor is positioned outside this area, it generates interference with the tire bead, causing possible damage to the sensor.
4. Set the wheel disc to the mounting machine, and install the lower tire bead.
5. Make sure the tire bead and tool do not interfere with the main body of the sensor and that the sensor is not clamped by the bead; install the upper bead.
6. When putting air into the tire, first install the tire pressure valve straight on the stem of the tire pressure warning valve and transmitter.
7. Install tire and wheel assembly.
8. When a new sensor is installed, the ID code will need to be registered. See Reset procedures. Up to two sets of codes can be registered. Since one ID for the originally installed sensor is registered at “MAIN” of the selector switch, use the “2nd” position to register an ID for the new sensor.
9. For any other type of replacement, the sensor ID code will not need to be re-registered. If using the originally installed tires, put the selector switch at “MAIN.” If using tires purchased later, put the switch at “2nd.”
10. After completing the operation, remove the valve core to rapidly release the air in the tire. Ensure the tire pressure warning light comes on. If the warning light does not come on, refer to appropriate manufacturer service information.
11. If there is an air leakage, tighten the nut to a force of 35 in.-lbs. (4 N.m), and push the valve core two to three times to remove any dirt attached to the valve core. If air continues to leak, replace the grommet, washer and nut. ■
Information for this column comes from Mitchell 1’s ”Tire Pressure Monitoring Systems Guide” for domestic and import vehicles through 2012. Headquartered in Poway, Calif., Mitchell 1 has provided quality repair information solutions to the automotive industry for more than 80 years. For more information, visit www.mitchell1.com.
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