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Home >> Lexus >> 2008 >> IS 350 >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting >> Lighting System >> DTC B2416 Height Control Sensor Malfunction >> Inspection Procedure

Inspection Procedure

  1. READ VALUE OF TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / AFS / Data List.
    5. Read the display on the Techstream.

      AFS (AFS ECU) 

      DIAGNOSTIC NOTE

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Fr Height Sens Front height sensor signal value / 0 to 5V Approx. 2.5 V -
      Rr Height Sens Rear height sensor signal value / 0 to 5V Approx. 2.5 V -

      OK: 

      Condition sign can be displayed. 

      Result 

      RESULT CHART

      Result Proceed to
      OK (When checking from PROBLEM SYMPTOMS TABLE) A
      OK (When checking from DIAGNOSTIC TROUBLE CODE CHART) B
      NG C

    B: REPLACE AFS ECU 

    C: Go to step 2 

    A: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

  2. CHECK HARNESS AND CONNECTOR (FRONT HEIGHT CONTROL SENSOR CIRCUIT) 
    1. Disconnect the A17 front height control sensor connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A17-1 (SHG) - A17-3 (SHB) Engine switch on (IG) 4.5 to 5.5 V
      3. Fig 1: Identifying A17 Front Height Control Sensor Connector
      G05832065Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  8

    OK: Go to Next Step 

  3. CHECK HARNESS AND CONNECTOR (REAR HEIGHT CONTROL SENSOR CIRCUIT) 
    1. Disconnect the Y2 rear height control sensor connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      Y2-1 (SHG) - Y2-3 (SHB) Engine switch on (IG) 4.5 to 5.5 V
      3. Fig 2: Identifying Y2 Rear Height Control Sensor Connector
      G05832066Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  9

    OK: Go to Next Step 

  4. CHECK HARNESS AND CONNECTOR (AFS ECU - FRONT HEIGHT CONTROL SENSOR) 
    1. Disconnect the A28 AFS ECU connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A28-2 (SHFL) -A17-2 (SHFL) Always Below 1 Ω
      A28-2 (SHFL) - Body ground Always 10 kΩ or higher
      3. Fig 3: Identifying Harness And Connector (AFS ECU - Front Height Control Sensor)
      G05832067Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  5. CHECK HARNESS AND CONNECTOR (AFS ECU - REAR HEIGHT CONTROL SENSOR) 
    1. Disconnect the Y2 sensor connector.
    2. Disconnect the A27 AFS ECU connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A27-9 (SHRL) - Y2-2 (SHRL) Always Below 1 Ω
      A27-9 (SHRL) - Body ground Always 10 kΩ or higher
      4. Fig 4: Identifying Harness And Connector (AFS ECU - Rear Height Control Sensor)
      G05832068Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  6. INSPECT HEIGHT CONTROL SENSOR (FRONT HEIGHT CONTROL SENSOR) 
    1. Connect 3 dry cell batteries (1.5 V) in series.
    2. Remove the height control sensor assembly front.
    3. Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead from the battery to terminal 1.
    4. Measure the voltage between terminals 2 and 1 while slowly moving the link up and down.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A17-2 (SHFL) - A17-1 (SHG) +45° Approx. 4.5 V
      A17-2 (SHFL) - A17-1 (SHG) 0° (Normal) Approx. 2.5 V
      A17-2 (SHFL) - A17-1 (SHG) -45° (Low) Approx. 0.5 V
      5. Fig 5: Identifying Height Control Sensor (Front Height Control Sensor)
      G05832069Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE HEIGHT CONTROL SENSOR (FRONT HEIGHT CONTROL SENSOR) 

    OK: Go to Next Step 

  7. INSPECT HEIGHT CONTROL SENSOR (REAR HEIGHT CONTROL SENSOR) 
    1. Connect 3 dry cell batteries (1.5 V) in series.
    2. Remove the height control sensor assembly rear.
    3. Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead from the battery to terminal 1.
    4. Measure the voltage between terminals 2 and 1 while slowly moving the link up and down.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      Y2-2 (SHRL) - Y2-1 (SHG) +45° Approx. 4.5 V
      Y2-2 (SHRL) - Y2-1 (SHG) 0° (Normal) Approx. 2.5 V
      Y2-2 (SHRL) - Y2-1 (SHG) -45° (Low) Approx. 0.5 V
      5. Fig 6: Identifying Height Control Sensor (Rear Height Control Sensor)
      G05832070Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE HEIGHT CONTROL SENSOR (REAR HEIGHT CONTROL SENSOR) 

    OK: REPLACE AFS ECU 

  8. CHECK HARNESS AND CONNECTOR (AFS ECU - FRONT HEIGHT CONTROL SENSOR) 
    1. Disconnect the A17 front height control sensor connector.
    2. Disconnect the A28 AFS ECU connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A28-1 (SBF) - A17-3 (SHB) Always Below 1 Ω
      A28-2 (SHFL) - A17-2 (SHFL) Always Below 1 Ω
      A28-17 (SGF) - A17-1 (SHG) Always Below 1 Ω
      A28-1 (SBF) - Body ground Always 10 kΩ or higher
      A28-2 (SHFL) - Body ground Always 10 kΩ or higher
      A28-17 (SGF) -Body ground Always 10 kΩ or higher
      4. Fig 7: Identifying Harness And Connector (AFS ECU - Front Height Control Sensor)
      G05832071Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (AFS ECU - FRONT HEIGHT CONTROL SENSOR) 

    OK: REPLACE AFS ECU 

  9. CHECK HARNESS AND CONNECTOR (AFS ECU - REAR HEIGHT CONTROL SENSOR) 
    1. Disconnect the Y2 sensor connector.
    2. Disconnect the A27 AFS ECU connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A27-10 (SBR) - Y2-3 (SHB) Always Below 1 Ω
      A27-9 (SHRL) - Y2-2 (SHRL) Always Below 1 Ω
      A27-20 (SGR) - Y2-1 (SHG) Always Below 1 Ω
      A27-10 (SBR) -Body ground Always 10 kΩ or higher
      A27-9 (SHRL) - Body ground Always 10 kΩ or higher
      A27-20 (SGR) - Body ground Always 10 kΩ or higher
      4. Fig 8: Identifying Harness And Connector (AFS ECU - Rear Height Control Sensor)
      G05832072Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (AFS ECU - REAR HEIGHT CONTROL SENSOR) 

    OK: REPLACE AFS ECU 

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