LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2014 >> LX 570 >> Repair and Diagnosis (Single Page) >> Suspension >> Wheels & Tire System >> Tire Pressure Warning System (Diagnostic Codes & Circuit Tests) >> Tire Pressure Warning System >> DTC C2121/21: No Signal from Transmitter ID1 in Main Mode; DTC C2122/22: No Signal from Transmitter ID2 in Main Mode; DTC C2123/23: No Signal from Transmitter ID3 in Main Mode; DTC C2124/24: No Signal from Transmitter ID4 in Main Mode; DTC C2125/25: No Signal from Transmitter ID5 in Main Mode; DTC C2181/81: Transmitter ID1 not Received (Test Mode DTC); DTC C2182/82: Transmitter ID2 not Received (Test Mode DTC); DTC C2183/83: Transmitter ID3 not Received (Test Mode DTC); DTC C2184/84: Transmitter ID4 not Received (Test Mode DTC); DTC C2185/85: Transmitter ID5 not Received (Test Mode DTC) [08/2013 - ] >> Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC C2121/21: No Signal from Transmitter ID1 in Main Mode; DTC C2122/22: No Signal from Transmitter ID2 in Main Mode; DTC C2123/23: No Signal from Transmitter ID3 in Main Mode; DTC C2124/24: No Signal from Transmitter ID4 in Main Mode; DTC C2125/25: No Signal from Transmitter ID5 in Main Mode; DTC C2181/81: Transmitter ID1 not Received (Test Mode DTC); DTC C2182/82: Transmitter ID2 not Received (Test Mode DTC); DTC C2183/83: Transmitter ID3 not Received (Test Mode DTC); DTC C2184/84: Transmitter ID4 not Received (Test Mode DTC); DTC C2185/85: Transmitter ID5 not Received (Test Mode DTC) [08/2013 - ]: Procedure

  1. CHECK DTC OUTPUT (C2179/79) 
    1. Turn the engine switch off.
    2. Connect the Techstream to the DLC3.
    3. Turn the engine switch on (IG) and turn the Techstream on.
    4. Enter the following menus: Chassis / Tire Pressure Monitor / Trouble Codes.
    5. Read DTCs.
      RESULT

      Result  Proceed to
      DTC C2179/79 is not output A
      DTC C2179/79 is output B

    B → GO TO DTC CHART  DTC C2179/79: Tire Pressure Monitor ECU Communication Stop [08/2013 - ]  

    A: Go to next step 

  2. CHECK FREQUENCY RECEIVING CONDITION 
    1. Check for the following conditions described below:
      1. Facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle.

        HINT: 

        If the vehicle is located in areas described above, the tire pressure warning light may turn on only in a particular area.

      2. Devices using similar radio frequencies are used in the vehicle.

        OK

        Facilities or devices that use similar radio frequencies are not located in or around the vehicle.

        HINT: 

        Radio frequencies may be interrupted due to the surroundings, or devices installed by the user.

    NG → CHECK IF ANY DEVICE IS INSTALLED BY USER 

    OK: Go to next step 

  3. IDENTIFY TRANSMITTER CORRESPONDING TO DTC 
    1. Set the tire pressure of all tires to the specified value(s). Refer to PRECAUTION [08/2013 - ] .
    2. Turn the engine switch off.
    3. Connect the Techstream to the DLC3.
    4. Turn the engine switch on (IG) and turn the Techstream on.
    5. Enter the following menus: Chassis / Tire Pressure Monitor / Data List.
    6. Check the values by referring to the table below.
      TIRE PRESSURE MONITOR

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      ID 1 Tire Inflation Pressure ID1 tire inflation pressure/
      min.: Absolute pressure (abs) / 0.0 kPa (0 kgf/cm2 , 0 psi), Relative pressure (gauge) / -2.5 kPa (-0.02 kgf/cm2 , -0.3 psi)
      max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2 , 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2 , 78 psi)      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*
      ID 2 Tire Inflation Pressure ID2 tire inflation pressure/
      min.: Absolute pressure (abs) / 0.0 kPa (0 kgf/cm2 , 0 psi), Relative pressure (gauge) / -2.5 kPa (-0.02 kgf/cm2 , -0.3 psi)
      max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2 , 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2 , 78 psi)      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*
      ID 3 Tire Inflation Pressure ID3 tire inflation pressure/
      min.: Absolute pressure (abs) / 0.0 kPa (0 kgf/cm2 , 0 psi), Relative pressure (gauge) / -2.5 kPa (-0.02 kgf/cm2 , -0.3 psi)
      max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2 , 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2 , 78 psi)      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*
      ID 4 Tire Inflation Pressure ID4 tire inflation pressure/
      min.: Absolute pressure (abs) / 0.0 kPa (0 kgf/cm2 , 0 psi), Relative pressure (gauge) / -2.5 kPa (-0.02 kgf/cm2 , -0.3 psi)
      max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2 , 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2 , 78 psi)      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*
      ID 5 Tire Inflation Pressure ID5 tire inflation pressure/
      min.: Absolute pressure (abs) / 0.0 kPa (0 kgf/cm2 , 0 psi), Relative pressure (gauge) / -2.5 kPa (-0.02 kgf/cm2 , -0.3 psi)
      max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2 , 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2 , 78 psi)      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*

      HINT: 

      • *: It may take about 2 or 3 minutes until the values are displayed.
      • The tire pressure information reception condition can also be confirmed through the multi-information display tire pressure display screen.
    7. Rapidly reduce the tire pressure for each tire at least 40 kPa (0.4 kgf/cm2 , 5.8 psi) within 30 seconds.
    8. Check the Data List.
      NOTE:
      • It takes about 2 or 3 minutes to display the updated tire pressure data.
      • When no "ID Tire Inflation Pressure" data has changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270°. Then rapidly release the tire pressure and recheck it.
      • Record the "ID Tire Inflation Pressure" data transmitter ID that corresponds to each tire.
    9. After confirming that the "ID Tire Inflation Pressure" data for one tire (ID1 to ID5) has changed, repeat this procedure for each tire. Identify the transmitter that corresponds to the DTC.
      RESULT

      Condition Proceed to
      All abnormal A
      One or more transmitters abnormal B
      All normal C

    B → See step   5 

    C → END 

    A: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (ECU - RECEIVER) 
    1. Disconnect the L10 ECU connector.
      GTY152386Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the K8 receiver connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L10-9 (RDA) - K8-1 (RDA) Always Below 1 Ω
      L10-4 (GND2) - K8-4 (GND) Always Below 1 Ω
      L10-10 (RF5V) - K8-5 (+5V) Always Below 1 Ω
      L10-9 (RDA) or K8-1 (RDA) - Body ground Always 10 kΩ or higher
      L10-4 (GND2) or K8-4 (GND) - Body ground Always 10 kΩ or higher
      L10-10 (RF5V) or K8-5 (+5V) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. INSPECT TIRE PRESSURE WARNING ECU 
    1. Turn the engine switch off.
    2. Connect the Techstream to the DLC3.
    3. Turn the engine switch on (IG) and turn the Techstream on.
    4. Enter the following menus: Chassis / Tire Pressure Monitor / Data List.
    5. Check the values by referring to the table below.
      TIRE PRESSURE MONITOR

      Tester Display Measurement Item/Display Normal Condition Diagnostic Note
      Registered ID 1 Code Registered ID1 code/
      min.: 0
      max.: FFFFFFF*      		 ID No. registered in transmitter ID1 displayed *: Displayed only when the ID No. is not registered.
      Registered ID 2 Code Registered ID2 code/
      min.: 0
      max.: FFFFFFF*      		 ID No. registered in transmitter ID2 displayed *: Displayed only when the ID No. is not registered.
      Registered ID 3 Code Registered ID3 code/
      min.: 0
      max.: FFFFFFF*      		 ID No. registered in transmitter ID3 displayed *: Displayed only when the ID No. is not registered.
      Registered ID 4 Code Registered ID4 code/
      min.: 0
      max.: FFFFFFF*      		 ID No. registered in transmitter ID4 displayed *: Displayed only when the ID No. is not registered.
      Registered ID 5 Code Registered ID5 code/
      min.: 0
      max.: FFFFFFF*      		 ID No. registered in transmitter ID5 displayed *: Displayed only when the ID No. is not registered.
    6. Check the ID number on the identified transmitter by removing it from the tire and wheel.
      GTY136741Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. Confirm that the ID number on the transmitter and recorded transmitter ID match.
      RESULT

      Result Proceed to
      Match A
      Do not match B

    B → See step   7 

    A: Go to next step 

  6. REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER 
    1. Replace the tire pressure warning valve and transmitter. Refer to REMOVAL [08/2013 - ] .

    NEXT: Go to next step 

  7. PERFORM REGISTRATION OF TRANSMITTER ID 
    1. Perform registration. Refer to REGISTRATION [08/2013 - ] .

    NEXT: Go to next step 

  8. PERFORM INITIALIZATION 
    1. Perform initialization. Refer to INITIALIZATION [08/2013 - ] .

    NEXT: Go to next step 

  9. CONFIRM TIRE INFLATION PRESSURE (DATA LIST) 
    1. Turn the engine switch off.
    2. Connect the Techstream to the DLC3.
    3. Turn the engine switch on (IG) and turn the Techstream on.
    4. Enter the following menus: Chassis / Tire Pressure Monitor / Data List.
    5. Check the values by referring to the table below.
      TIRE PRESSURE MONITOR

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      ID 1 Tire Inflation Pressure ID1 tire inflation pressure/
      min.: Absolute pressure (abs) / 0.0 kPa (0 kgf/cm2 , 0 psi), Relative pressure (gauge) / -2.5 kPa (-0.02 kgf/cm2 , -0.3 psi)
      max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2 , 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2 , 78 psi)      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*
      ID 2 Tire Inflation Pressure ID2 tire inflation pressure/
      min.: Absolute pressure (abs) / 0.0 kPa (0 kgf/cm2 , 0 psi), Relative pressure (gauge) / -2.5 kPa (-0.02 kgf/cm2 , -0.3 psi)
      max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2 , 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2 , 78 psi)      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*
      ID 3 Tire Inflation Pressure ID3 tire inflation pressure/
      min.: Absolute pressure (abs) / 0.0 kPa (0 kgf/cm2 , 0 psi), Relative pressure (gauge) / -2.5 kPa (-0.02 kgf/cm2 , -0.3 psi)
      max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2 , 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2 , 78 psi)      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*
      ID 4 Tire Inflation Pressure ID4 tire inflation pressure/
      min.: Absolute pressure (abs) / 0.0 kPa (0 kgf/cm2 , 0 psi), Relative pressure (gauge) / -2.5 kPa (-0.02 kgf/cm2 , -0.3 psi)
      max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2 , 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2 , 78 psi)      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*
      ID 5 Tire Inflation Pressure ID5 tire inflation pressure/
      min.: Absolute pressure (abs) / 0.0 kPa (0 kgf/cm2 , 0 psi), Relative pressure (gauge) / -2.5 kPa (-0.02 kgf/cm2 , -0.3 psi)
      max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2 , 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2 , 78 psi)      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*

      HINT: 

      • *: It may take about 2 or 3 minutes until the values are displayed.
      • The tire pressure information reception condition can also be confirmed through the multi-information display tire pressure display screen.
      • When no "ID Tire Inflation Pressure" data has changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270°. Then rapidly release the tire pressure and recheck it.
      RESULT

      Result Proceed to
      Tire pressure values are not displayed. A
      All tire pressure readings are equal to specified values. B

    B → END 

    A: Go to next step 

  10. REPLACE TIRE PRESSURE WARNING ANTENNA AND RECEIVER 
    1. Replace the tire pressure warning antenna and receiver. Refer to REMOVAL [08/2013 - ] .

    NEXT: Go to next step 

  11. CONFIRM TIRE INFLATION PRESSURE (DATA LIST) 
    1. Turn the engine switch off.
    2. Connect the Techstream to the DLC3.
    3. Turn the engine switch on (IG) and turn the Techstream on.
    4. Enter the following menus: Chassis / Tire Pressure Monitor / Data List.
    5. Check the values by referring to the table below.
      TIRE PRESSURE MONITOR

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      ID 1 Tire Inflation Pressure ID1 tire inflation pressure/
      min.: Absolute pressure (abs) / 0.0 kPa (0 kgf/cm2 , 0 psi), Relative pressure (gauge) / -2.5 kPa (-0.02 kgf/cm2 , -0.3 psi)
      max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2 , 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2 , 78 psi)      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*
      ID 2 Tire Inflation Pressure ID2 tire inflation pressure/
      min.: Absolute pressure (abs) / 0.0 kPa (0 kgf/cm2 , 0 psi), Relative pressure (gauge) / -2.5 kPa (-0.02 kgf/cm2 , -0.3 psi)
      max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2 , 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2 , 78 psi)      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*
      ID 3 Tire Inflation Pressure ID3 tire inflation pressure/
      min.: Absolute pressure (abs) / 0.0 kPa (0 kgf/cm2 , 0 psi), Relative pressure (gauge) / -2.5 kPa (-0.02 kgf/cm2 , -0.3 psi)
      max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2 , 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2 , 78 psi)      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*
      ID 4 Tire Inflation Pressure ID4 tire inflation pressure/
      min.: Absolute pressure (abs) / 0.0 kPa (0 kgf/cm2 , 0 psi), Relative pressure (gauge) / -2.5 kPa (-0.02 kgf/cm2 , -0.3 psi)
      max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2 , 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2 , 78 psi)      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*
      ID 5 Tire Inflation Pressure ID5 tire inflation pressure/
      min.: Absolute pressure (abs) / 0.0 kPa (0 kgf/cm2 , 0 psi), Relative pressure (gauge) / -2.5 kPa (-0.02 kgf/cm2 , -0.3 psi)
      max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2 , 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2 , 78 psi)      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*

      HINT: 

      • *: It may take about 2 or 3 minutes until the values are displayed.
      • The tire pressure information reception condition can also be confirmed through the multi-information display tire pressure display screen.
      • When no "ID Tire Inflation Pressure" data has changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270°. Then rapidly release the tire pressure and recheck it.
      RESULT

      Result Proceed to
      Tire pressure values are not displayed. A
      All tire pressure readings are equal to specified values. B

    B → END 

    A → See step   12 

  12. REPLACE TIRE PRESSURE WARNING ECU. Refer to  REMOVAL [08/2013 - ] 
scientia non olet · About LEMON Manuals