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Home >> Lexus >> 2009 >> RX 350 FWD >> Repair and Diagnosis >> Suspension >> Rear Suspension >> Air Suspension System (Diagnostic Codes & Circuit Tests) >> Air Suspension System >> DTC C1711: Front Height Control Sensor RH Circuit Malfunction; DTC C1712: Front Height Control Sensor LH Circuit Malfunction; DTC C1713: Rear Height Control Sensor RH Circuit Malfunction; DTC C1714: Rear Height Control Sensor LH Circuit Malfunction >> Procedure

DTC C1711: Front Height Control Sensor RH Circuit Malfunction; DTC C1712: Front Height Control Sensor LH Circuit Malfunction; DTC C1713: Rear Height Control Sensor RH Circuit Malfunction; DTC C1714: Rear Height Control Sensor LH Circuit Malfunction: Procedure

  1. RECONFIRM DTC 
    1. Check DTCs. Refer to DTC CHECK / CLEAR .
      1. Confirm if DTC C1761/61 and/or C1774/74 is recorded.

        OK

        DTC C1761/61 and/or C1774/74 is not output.

        HINT: 

        If either DTCC1761/61 (ECU malfunction) or C1774/74 (power source circuit) is displayed, carry out the necessary inspection. If they are output at the same time, carry out the necessary inspection for DTC C1774/74 first.

    NG → REPAIR CIRCUIT INDICATED BY OUTPUT CODE 

    OK: Go to next step 

  2. READ VALUE USING TECHSTREAM 

    HINT: 

    When not using the Techstream, go to step  3.

    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to the ON position, and push the Techstream main switch ON.
    3. Select the item below in the DATA LIST, and read its value displayed on the Techstream.

      Air suspension

      Item Normal Condition
      FR Height Control Sensor Min.: -80 mm (-3.15 in.)
      Max.: 80 mm (3.15 in.)
      FL Height Control Sensor Min.: -80 mm (-3.15 in.)
      Max.: 80 mm (3.15 in.)
      RR Height Control Sensor Min.: -80 mm (-3.15 in.)
      Max.: 80 mm (3.15 in.)
      RL Height Control Sensor Min.: -80 mm (-3.15 in.)
      Max.: 80 mm (3.15 in.)
    4. Check the vehicle height value of each sensor while pressing the height control switch "UP" and "DOWN".

      OK

      Vehicle height value changes

    NG → Go to next step 

    OK → REPLACE SUSPENSION CONTROL ECU 

  3. CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL SENSOR SUB-ASSEMBLY POWER SOURCE) 
    1. Disconnect the height control sensor sub-assembly connector.
      Fig 1: Identifying Height Control Sensor Sub-Assembly Connector Terminals (1 Of 2)
      GTY154805Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 2: Identifying Height Control Sensor Sub-Assembly Connector Terminals (2 Of 2)
      GTY127775Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch ON.
    3. Measure the voltage according to the values in the table below.

      Standard voltage (Front RH): (C1711/11)

      Tester Connection Specified Condition
      H13-1 (SHB) - H13-3 (SHG) 4.75 to 5.25 V

      Standard voltage: (Front LH): (C1712/12)

      Tester Connection Specified Condition
      H12-1 (SHG) - H12-3 (SHB) 4.75 to 5.25 V

      Standard voltage: (Rear RH): (C1713/13)

      Tester Connection Specified Condition
      H26-1 (SHG) - H26-3 (SHB) 4.75 to 5.25 V

      Standard voltage: (Rear LH): (C1714/14)

      Tester Connection Specified Condition
      H25-1 (SHB) - H25-3 (SHG) 4.75 to 5.25 V

    NG → See step   6 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - HEIGHT CONTROL SENSOR SUB-ASSEMBLY) 
    1. Disconnect the suspension control ECU S16 or S14 connector.
      Fig 3: Identifying Suspension Control ECU S16 Or S14 Connector
      GTY154807Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the values in the table below.

      Standard resistance (Front RH): (C1711/11)

      Tester Connection Specified Condition
      S16-27 (SHFR) - H13-2 (SHFR) Below 1 Ω
      S16-27 (SHFR) - Body ground 10 kΩ or higher

      Standard resistance: (Front LH): (C1712/12)

      Tester Connection Specified Condition
      S16-28 (SHFL) - H12-2 (SHFL) Below 1 Ω
      S16-28 (SHFL) - Body ground 10 kΩ or higher

      Standard resistance: (Rear RH): (C1713/13)

      Tester Connection Specified Condition
      S14-24 (SHRR) - H26-2 (SHRR) Below 1 Ω
      S14-24 (SHRR) - Body ground 10 kΩ or higher

      Standard resistance: (Rear LH): (C1714/14)

      Tester Connection Specified Condition
      S14-23 (SHRL) - H25-2 (SHRL) Below 1 Ω
      S14-23 (SHRL) - Body ground 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. INSPECT HEIGHT CONTROL SENSOR SUB-ASSEMBLY 
    1. HEIGHT CONTROL SENSOR FRONT RH: (C1711/11)
      Fig 4: Identifying Height Control Sensor Sub-Assembly Front RH Connector Terminals
      GTY155207Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the values in the table below.

        Standard resistance

        Tester Connection Specified Condition
        1 (SHB) - 3 (SHG) 4.3 +- 1.3 kΩ
        1 (SHB) - 2 (SHFR) Repeat about 0.4 to 3.9 kΩ

        Result

        Result Proceed to
        OK A
        NG B
    2. HEIGHT CONTROL SENSOR FRONT LH: (C1712/12)
      Fig 5: Identifying Height Control Sensor Front LH Connector Terminals
      GTY155208Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the values in the table below.

        Standard resistance

        Tester Connection Specified Condition
        1 (SHG) - 3 (SHB) 4.3 +- 1.3 kΩ
        2 (SHFL) - 3 (SHB) Repeat about 0.4 to 3.9 kΩ

        Result

        Result Proceed to
        OK A
        NG C
    3. HEIGHT CONTROL SENSOR REAR RH: (C1713/13)
      Fig 6: Identifying Height Control Sensor Rear RH Connector Terminals
      GTY138076Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the values in the table below.

        Standard resistance

        Tester Connection Specified Condition
        1 (SHG) - 3 (SHB) 4.3 +- 1.3 kΩ
        2 (SHRR) - 3 (SHB) Repeat about 0.4 to 3.9 kΩ

        Result

        Result Proceed to
        OK A
        NG D
    4. HEIGHT CONTROL SENSOR REAR LH: (C1714/14)
      Fig 7: Identifying Height Control Sensor Rear RH Connector Terminals
      GTY155209Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the values in the table below.

        Standard resistance

        Tester Connection Specified Condition
        1 (SHB) - 3 (SHG) 4.3 +- 1.3 kΩ
        1 (SHB) - 2 (SHRL) Repeat about 0.4 to 3.9 kΩ

        Result

        Result Proceed to
        OK A
        NG E

    E → REPLACE HEIGHT CONTROL SENSOR SUB-ASSEMBLY REAR LH 

    D → REPLACE HEIGHT CONTROL SENSOR SUB-ASSEMBLY REAR RH 

    C → REPLACE HEIGHT CONTROL SENSOR SUB-ASSEMBLY FRONT LH 

    B → REPLACE HEIGHT CONTROL SENSOR SUB-ASSEMBLY FRONT RH 

    A → REPLACE SUSPENSION CONTROL ECU 

  6. CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU- HEIGHT CONTROL SENSOR SUB-ASSEMBLY) 
    1. Disconnect the suspension control ECU connectors.
      Fig 8: Identifying Suspension Control ECU Connector Terminals
      GTY155991Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the values in the table below.

      Standard resistance (Front RH): (C1711/11)

      Tester Connection Specified Condition
      S15-18 (SBR1) - H13-1 (SHB) Below 1 Ω
      S15-22 (SGR1) - H13-3 (SHG) Below 1 Ω
      S15-18 (SBR1) - Body ground 10 kΩ or higher
      S15-22 (SGR1) - Body ground 10 kΩ or higher

      Standard resistance: (Front LH): (C1712/12)

      Tester Connection Specified Condition
      S15-21 (SBL1) - H12-3 (SHB) Below 1 Ω
      S16-25 (SGL1) - H12-1 (SHG) Below 1 Ω
      S15-21 (SBL1) - Body ground 10 kΩ or higher
      S16-25 (SGL1) - Body ground 10 kΩ or higher

      Standard resistance: (Rear RH): (C1713/13)

      Tester Connection Specified Condition
      S14-19 (SGR2) - H26-1 (SHG) Below 1 Ω
      S14-20 (SBR2) - H26-3 (SHB) Below 1 Ω
      S14-19 (SGR2) - Body ground 10 kΩ or higher
      S14-20 (SBR2) - Body ground 10 kΩ or higher

      Standard resistance: (Rear LH): (C1714/14)

      Tester Connection Specified Condition
      S14-21 (SGL2) - H25-3 (SHG) Below 1 Ω
      S14-22 (SBL2) - H25-1 (SHB) Below 1 Ω
      S14-21 (SGL2) - Body ground 10 kΩ or higher
      S14-22 (SBL2) - Body ground 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - HEIGHT CONTROL SENSOR SUB-ASSEMBLY) 
    1. Disconnect the suspension control ECU S16 or S14 connector.
      Fig 9: Identifying Suspension Control ECU S16 Or S14 Connector
      GTY130323Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the values in the table below.

      Standard resistance (Front RH): (C1711/11)

      Tester Connection Specified Condition
      S16-27 (SHFR) - H13-2 (SHFR) Below 1 Ω
      S16-27 (SHFR) - Body ground 10 kΩ or higher

      Standard resistance: (Front LH): (C1712/12)

      Tester Connection Specified Condition
      S16-28 (SHFL) - H12-2 (SHFL) Below 1 Ω
      S16-28 (SHFL) - Body ground 10 kΩ or higher

      Standard resistance: (Rear RH): (C1713/13)

      Tester Connection Specified Condition
      S14-24 (SHRR) - H26-2 (SHRR) Below 1 Ω
      S14-24 (SHRR) - Body ground 10 kΩ or higher

      Standard resistance: (Rear LH): (C1714/14)

      Tester Connection Specified Condition
      S14-23 (SHRL) - H25-2 (SHRL) Below 1 Ω
      S14-23 (SHRL) - Body ground 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  8. CHECK HEIGHT CONTROL SENSOR SUB-ASSEMBLY 
    1. HEIGHT CONTROL SENSOR FRONT RH: (C1711/11)
      Fig 10: Identifying Height Control Sensor Sub-Assembly Front RH Connector Terminals
      GTY155207Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the values in the table below.

        Standard resistance

        Tester Connection Specified Condition
        1 (SHB) - 3 (SHG) 4.3 +- 1.3 kΩ
        1 (SHB) - 2 (SHFR) Repeat about 0.4 to 3.9 kΩ

        Result

        Result Proceed to
        OK A
        NG B
    2. HEIGHT CONTROL SENSOR FRONT LH: (C1712/12)
      Fig 11: Identifying Height Control Sensor Front LH Connector Terminals
      GTY155208Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the values in the table below.

        Standard resistance

        Tester Connection Specified Condition
        1 (SHG) - 3 (SHB) 4.3 +- 1.3 kΩ
        2 (SHFL) - 3 (SHB) Repeat about 0.4 to 3.9 kΩ

        Result

        Result Proceed to
        OK A
        NG C
    3. HEIGHT CONTROL SENSOR REAR RH: (C1713/13)
      Fig 12: Identifying Height Control Sensor Rear RH Connector Terminals
      GTY138076Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the values in the table below.

        Standard resistance

        Tester Connection Specified Condition
        1 (SHG) - 3 (SHB) 4.3 +- 1.3 kΩ
        2 (SHRR) - 3 (SHB) Repeat about 0.4 to 3.9 kΩ

        Result

        Result Proceed to
        OK A
        NG D
    4. HEIGHT CONTROL SENSOR REAR LH: (C1714/14)
      Fig 13: Identifying Height Control Sensor Rear RH Connector Terminals
      GTY155209Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the values in the table below.

        Standard resistance

        Tester Connection Specified Condition
        1 (SHB) - 3 (SHG) 4.3 +- 1.3 kΩ
        1 (SHB) - 2 (SHRL) Repeat about 0.4 to 3.9 kΩ

        Result

        Result Proceed to
        OK A
        NG E

    E → REPLACE HEIGHT CONTROL SENSOR SUB-ASSEMBLY REAR LH 

    D → REPLACE HEIGHT CONTROL SENSOR SUB-ASSEMBLY REAR RH 

    C → REPLACE HEIGHT CONTROL SENSOR SUB-ASSEMBLY FRONT LH 

    B → REPLACE HEIGHT CONTROL SENSOR SUB-ASSEMBLY FRONT RH 

    A → REPLACE SUSPENSION CONTROL ECU 

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