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Home >> Lexus >> 2008 >> IS 250 RWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 2 (Lighting (Exterior)) >> Lighting System >> DTC B2416: Height Control Sensor Malfunction >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
  1. READ VALUE USING 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) 

      DATA LIST - AFS (AFS ECU)

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Fr Height Sens Front height sensor signal value / 0 to 5V 0 5 to 4 5 V -
      Rr Height Sens Rear height sensor signal value / 0 to 5V 0 5 to 4 5 V -

      OK: Condition sign can be displayed. 

      Result 

      RESULT REFERENCE

      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  (See AFS ECU  )

    C: Go to step 2 

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

  2. CHECK HARNESS AND CONNECTOR (FRONT HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH CIRCUIT) 
    1. Disconnect the W2 front height control sensor sub-assembly LH connector
    2. Measure the voltage according to the value (s) in the table below

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Switch Condition Specified Condition
      W2-1 (SHG) - W2-3 (SHB) Engine switch on (IG) 4 5 to 5.5 V
      3. Fig 1: Identifying W2 Front Height Control Sensor Sub-Assembly LH Connector
      G05756406Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step  8

    OK: Go to next Step 

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

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Switch 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 Sub-Assembly LH Connector
      G05756407Courtesy 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 SUB-ASSEMBLY LH) 
    1. Disconnect the A28 AFS ECU connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      A28-2 (SHFL) - W2-2 (SHFL) Always Below 1 Ω
      A28-2 (SHFL) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 3: Identifying A28 AFS ECU Connector
    G05756408Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next Step 

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

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      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 A27 AFS ECU Connector
      G05756409Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next Step 

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

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      W2-2 (SHFL) - W2-1 (SHG) +45° Approx 4.5 V
      W2-2 (SHFL) - W2-1 (SHG) 0° (Normal) Approx 2 5V
      W2-2 (SHFL) - W2-1 (SHG) -45° (Low) Approx. 0.5 V
      5. Fig 5: Measuring Voltage Between Front Height Control Sensor Sub-Assembly Connector Terminal
      G05756410Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE FRONT HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH  (See HEIGHT CONTROL SENSOR  )

    OK: Go to next Step 

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

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION

      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: Measuring Voltage Between Rear Height Control Sensor Sub-Assembly Connector Terminal
      G05756411Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH  (See HEIGHT CONTROL SENSOR  )

    OK: REPLACE AFS ECU  (See AFS ECU  )

  8. CHECK HARNESS AND CONNECTOR (AFS ECU - FRONT HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH) 
    1. Disconnect the W2 front height control sensor sub-assembly connector.
    2. Disconnect the A28 AFS ECU connector.
    3. Measure the resistance according to the value (s) in the table below

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      A28-1 (SBF) - W2-3 (SHB) Always Below 1 Ω
      A28-2 (SHFL) - W2-2 (SHFL) Always Below 1 Ω
      A28-17 (SGF) - W2-1 (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 W2 Front Height Control Sensor Sub-Assembly Connector And A28 AFS ECU Connector
      G05756412Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: REPLACE AFS ECU  (See AFS ECU  )

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

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      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 A27 AFS ECU Connector
      G05756413Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: REPLACE AFS ECU  (See AFS ECU  )

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