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Home >> Lexus >> 2010 >> RX 350 FWD >> Repair and Diagnosis >> Suspension >> Electronic Suspension >> Air Suspension (Diagnostic Codes) >> 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 (FROM 08/2009) >> 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 (FROM 08/2009): Procedure

  1. INSPECT HEIGHT CONTROL SENSOR 
    1. Check the front height control sensor:
      1. Disconnect the height control sensor front RH connector or height control sensor front LH connector.
        NOTE:

        Do not drop the height control sensor. If it is dropped, replace it with a new one.

        Fig 1: Identifying Height Control Sensor Front
        GTY263398Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Connect 3 1.5 V dry cell batteries in series.
      3. Connect a positive (+) lead from the battery to terminal 3 (SHB) of the height control sensor and a negative (-) lead to terminal 1 (SHG). While applying 4.5 V, slowly moving the sensor's link up and down, and measure the voltage between terminal 2 (SHFR*1 or SHFL*2) and terminal 1 (SHG).

        HINT: 

        *1: for RH

        *2: for LH

        Standard voltage

        FOR RH

        Tester Connection Condition Specified Condition
        2 (SHFR) - 1 (SHG) Max. HI 3.95 to 4.15 V
        Normal 2.15 to 2.35 V
        Min. LO 0.35 to 0.55 V
        FOR LH

        Tester Connection Condition Specified Condition
        2 (SHFL) - 1 (SHG) Max. HI 3.95 to 4.15 V
        Normal 2.15 to 2.35 V
        Min. LO 0.35 to 0.55 V
        TEXT IN ILLUSTRATION

        *1 Component without harness connected
        (Height Control Sensor Front)
        NOTE:

        Do not apply a voltage of more than 6 V.

    2. Check the rear height control sensor:
      1. Disconnect the height control sensor rear RH connector or height control sensor rear LH connector.
        NOTE:

        Do not drop the height control sensor. If it is dropped, replace it with a new one.

        Fig 2: Identifying Rear Height Control Sensor
        GTY277971Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Connect 3 1.5 V dry cell batteries in series.
      3. Connect a positive (+) lead from the battery to terminal 3 (SHB) of the height control sensor and a negative (-) lead to terminal 1 (SHG). While applying 4.5 V, slowly moving the sensor's link up and down, and measure the voltage between terminal 2 (SHRR*1 or SHRL*2) and terminal 1 (SHG).

        HINT: 

        *1: for RH

        *2: for LH

        Standard voltage

        FOR RH

        Tester Connection Condition Specified Condition
        2 (SHRR) - 1 (SHG) Max. HI 3.95 to 4.15 V
        Normal 2.15 to 2.35 V
        Min. LO 0.35 to 0.55 V
        FOR LH

        Tester Connection Condition Specified Condition
        2 (SHRL) - 1 (SHG) Max. HI 3.95 to 4.15 V
        Normal 2.15 to 2.35 V
        Min. LO 0.35 to 0.55 V
        TEXT IN ILLUSTRATION

        *1 Component without harness connected
        (Height Control Sensor Rear)
        NOTE:

        Do not apply a voltage of more than 6 V.

      Result

      Condition Proceed to
      OK A
      Height control sensor front RH malfunction B
      Height control sensor front LH malfunction C
      Height control sensor rear RH malfunction D
      Height control sensor rear LH malfunction E

    E → See step   7 

    D → See step   6 

    C → See step   5 

    B → See step   4 

    A: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL SENSOR - SUSPENSION CONTROL ECU) 
    1. Check the height control sensor front RH side: (C1711)
      1. Turn the engine switch off.
      2. Disconnect the A55 ECU connectors.
      3. Disconnect the A39 sensor connector.
      4. Measure the resistance according to the value(s) in the table below.
        Fig 3: Identifying A55 ECU And A39 Sensor Connectors
        GTY268279Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard resistance

        Tester Connection Condition Specified Condition
        A39-1 (SHG) - A55-12 (SHG1) Always Below 1 Ω
        A39-2 (SHFR) - A55-20 (SHFR) Always Below 1 Ω
        A39-3 (SHB) - A55-13 (SHB1) Always Below 1 Ω
        A55-12 (SHG1) - Body ground Always 10 kΩ or higher
        A55-20 (SHFR) - Body ground Always 10 kΩ or higher
        A55-13 (SHB1) - Body ground Always 10 kΩ or higher
        TEXT IN ILLUSTRATION

        *1 Front view of wire harness connector
        (to Height Control Sensor Front RH)
        *2 Rear view of wire harness connector
        (to Suspension Control ECU)
    2. Check the height control sensor front LH side: (C1712)
      1. Turn the engine switch off.
      2. Disconnect the A55 ECU connectors.
      3. Disconnect the A38 sensor connector.
      4. Measure the resistance according to the value(s) in the table below.
        Fig 4: A55 ECU And A38 Sensor Connector
        GTY284754Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard resistance

        Tester Connection Condition Specified Condition
        A38-1 (SHG) - A55-11 (SHG2) Always Below 1 Ω
        A38-2 (SHFL) - A55-24 (SHFL) Always Below 1 Ω
        A38-3 (SHB) - A55-14 (SHB2) Always Below 1 Ω
        A55-11 (SHG2) - Body ground Always 10 kΩ or higher
        A55-24 (SHFL) - Body ground Always 10 kΩ or higher
        A55-14 (SHB2) - Body ground Always 10 kΩ or higher
        TEXT IN ILLUSTRATION

        *1 Front view of wire harness connector
        (to Height Control Sensor Front LH)
        *2 Rear view of wire harness connector
        (to Suspension Control ECU)
    3. Check the height control sensor rear RH side: (C1713)
      1. Turn the engine switch off.
      2. Disconnect the A54 ECU connector.
      3. Disconnect the R4 sensor connector.
      4. Measure the resistance according to the value(s) in the table below.
        Fig 5: Identifying A54 ECU And R4 Sensor Connector
        GTY282981Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard resistance

        Tester Connection Condition Specified Condition
        R4-1 (SHG) - A54-15 (SHG3) Always Below 1 Ω
        R4-2 (SHRR) - A54-24 (SHRR) Always Below 1 Ω
        R4-3 (SHB) - A54-14 (SHB3) Always Below 1 Ω
        A54-15 (SHG3) - Body ground Always 10 kΩ or higher
        A54-24 (SHRR) - Body ground Always 10 kΩ or higher
        A54-14 (SHB3) - Body ground Always 10 kΩ or higher
        TEXT IN ILLUSTRATION

        *1 Front view of wire harness connector
        (to Height Control Sensor Rear RH)
        *2 Rear view of wire harness connector
        (to Suspension Control ECU)
    4. Check the height control sensor rear LH side: (C1714)
      1. Turn the engine switch off.
      2. Disconnect the A54 ECU connector.
      3. Disconnect the R2 sensor connector.
      4. Measure the resistance according to the value(s) in the table below.
        Fig 6: Identifying A54 ECU And R2 Sensor Connector
        GTY260628Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard resistance

        Tester Connection Condition Specified Condition
        R2-1 (SHG) - A54-16 (SHG4) Always Below 1 Ω
        R2-2 (SHRL) - A54-26 (SHRL) Always Below 1 Ω
        R2-3 (SHB) - A54-13 (SHB4) Always Below 1 Ω
        A54-16 (SHG4) - Body ground Always 10 kΩ or higher
        A54-26 (SHRL) - Body ground Always 10 kΩ or higher
        A54-13 (SHB4) - Body ground Always 10 kΩ or higher
        TEXT IN ILLUSTRATION

        *1 Front view of wire harness connector
        (to Height Control Sensor Rear LH)
        *2 Rear view of wire harness connector
        (to Suspension Control ECU)

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   3 

  3. REPLACE SUSPENSION CONTROL ECU. Refer to  REMOVAL 
  4. REPLACE HEIGHT CONTROL SENSOR FRONT RH. Refer to  REMOVAL 
  5. REPLACE HEIGHT CONTROL SENSOR FRONT LH. Refer to  REMOVAL 
  6. REPLACE HEIGHT CONTROL SENSOR REAR RH. Refer to  REMOVAL 
  7. REPLACE HEIGHT CONTROL SENSOR REAR LH. Refer to  REMOVAL 
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