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Variable Gear Ratio Steering System: Calibration

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use this procedure to center the steering wheel if:
  • The steering actuator (power steering gear assembly) has been replaced.
  • The steering control ECU has been replaced.
  • The steering column or steering intermediate shaft has been disconnected.
  • The steering wheel is still off-center after completing the steering angle sensor initialization.
  1. VGRS SYSTEM CALIBRATION PROCEDURE (USING SST CHECK WIRE) 
    1. FACE TIRES STRAIGHT AHEAD 
      NOTE: Drive the vehicle to confirm that the steering wheel is centered.
    2. CHECK DTC 
      1. Check for DTCs (see DTC CHECK / CLEAR  )

        Result 

        RESULT CHART

        Result Proceed to
        DTC C1591/51 is not output A
        DTC C1591/51 is output B

      B:  Go to step  4

      A: Go to Next Step 

    3. PERFORM ACTUATOR ANGLE INITIALIZATION 
      NOTE: If the procedures from *1 to *2 are not completed within 1 minute, or if errors are made during these procedures, perform the initialization again from the beginning.
      1. Turn the power switch ON (READY)
      2. Center the steering wheel
      3. Using SST, connect terminals 12 (TS) and 4 (CG), and 13 (TC) and 4 (CG) of the DLC3 (*1)

        SST 09843-18040 

      4. Disconnect SST from terminal 12 (TS) of the DLC3, and turn the steering wheel to the left 180° or more
      5. Connect SST to terminal 12 (TS) of the DLC3
      6. Disconnect SST from terminal 13 (TC) of the DLC3, and turn the steering wheel to the right 180° or more
        Fig 1: Identifying DLC3 Connector Terminals
        G04944114Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      7. Connect SST to terminal 13 (TC) of the DLC3. (*2)

        HINT.

        When the master warning light comes on, DTC C1591/51 is memorized

      8. Disconnect SST from the DLC3.
      9. Turn the power switch OFF
    4. FACE TIRES STRAIGHT AHEAD 
      1. Confirm that the steering wheel is centered when facing the tires straight ahead.
        NOTE: Drive the vehicle to confirm that the steering wheel is centered.

        Result 

        RESULT CHART

        Result Proceed to
        Steering wheel is off-center A
        Steering wheel is centered B

      B:  Go to step  8

      A: Go to Next Step 

    5. UNLOCK STEERING ACTUATOR 
      NOTE: Do not turn the power switch ON (READY).
      1. Turn the power switch OFF.
      2. Disconnect the negative (-) terminal cable from the auxiliary battery.
      3. Disconnect the z16 connector from the steering actuator.
      4. Connect a jumper wire from terminal LV to the positive (+) 12 V battery terminal and another jumper wire from terminal LG to the negative (-) 12 V battery terminal.
        NOTE: Do not apply voltage for more than 3 minutes.
        Fig 2: Identifying Steering Actuator Harness Connector Z16
        G05782328Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. STEERING CENTER ADJUSTMENT 
      1. Center the steering wheel.
        NOTE: If the centering of the spiral cable was not confirmed when the steering wheel was installed, confirm the centering of the spiral cable (see INSTALLATION ).
    7. LOCK STEERING ACTUATOR 
      1. Disconnect the positive (+) and negative (-) 12 V battery terminal cables from the steering actuator.
      2. Connect the z16 connector to the steering actuator
      3. Connect the negative (-) terminal cable to the auxiliary battery
      4. Turn the steering wheel approximately 3° to the left and right Confirm that the reaction force can be felt
        NOTE:
        • If the above procedures are not followed correctly, a DTC will be detected. If a DTC is detected, perform the above procedures again and then check for DTCs.
        • Perform these procedures with the power switch OFF.
    8. ADJUST ACTUATOR ANGLE 

      HINT

      Activating and ending test mode will complete actuator angle adjustment.

      1. Make sure the power switch is OFF
        NOTE: Do not touch the steering wheel during these procedures.
      2. Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3

        SST 09843-18040 

      3. Turn the power switch ON (IG).
      4. Confirm that the "VGRS TEST MODE" is displayed on the multi-information display when test mode is activated

        HINT.

        Wait approximately 5 seconds

      5. Turn the power switch OFF
      6. Disconnect SST from terminals 12 (TS) and 4 (CG) of the DLC3
      7. Turn the power switch ON (IG) again
        Fig 3: Identifying DLC3 Connector Terminals
        G04944107Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    9. CHECK MASTER WARNING LIGHT 
      1. Confirm that the master warning light is off
      2. Turn the power switch OFF, then ON (IG)
      3. Confirm that the master warning light is operating normally
    10. CHECK STEERING WHEEL OPERATION 
      1. Turn the power switch ON (READY).
      2. Perform the steering angle sensor initialization (see INITIALIZATION  )
      3. Turn the steering wheel from lock to lock and check that it rotates approximately 2.7 turns.
      4. Drive the vehicle and confirm that the steering wheel is centered

      NEXT: END 

  2. VGRS SYSTEM CALIBRATION PROCEDURE (USING INTELLIGENT TESTER) 
    1. FACE TIRES STRAIGHT AHEAD 
      NOTE: Drive the vehicle to confirm that the steering wheel is centered.
    2. PERFORM VGRS SYSTEM CALIBRATION 
      1. Connect the Intelligent tester to the DLC3.
      2. Turn the power switch ON (IG).
      3. Turn the tester on.
      4. Enter the menu items in this order: DIAGNOSIS / OBD/ MOBD / CHASSIS / VGRS Then, select the "STEER ANGLE ADJ" item, and press "ENTER" to move to next screen
      5. "NOTICE" screen is displayed. Then, press "ENTER"
        NOTE: Press the "ENTER" key even if DTC C15B4/71 is output.
      6. "NOTICE" screen is displayed. Then, press "ENTER"
        NOTE: Ensure that the power switch is OFF.
        Fig 4: Screen Display - STEER ANGLE ADJ
        G04950174Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      7. "STEERING ANGLE ADJ" screen is displayed. Then, press "YES".
      8. "STEERING ANGLE ADJ" screen is displayed. Then, press "ENTER"
        NOTE: If the centering of the spiral cable was not confirmed when the steering wheel was installed, confirm the centering of the spiral cable (see INSTALLATION ).
      9. "NOTICE" screen is displayed. Then, press "ENTER".
        NOTE: Do not touch the steering wheel during these procedures.
      10. "NOTICE" screen is displayed. Then, press "ENTER".
      11. "NOTICE" screen is displayed. Then, press "ENTER".
        NOTE: Do not touch the steering wheel during these procedures.
      12. The remaining time is displayed and the display switches automatically to the next screen
        NOTE: Do not touch the steering wheel during these procedures.
      13. Check that the VGRS system calibration is completed normally.
      14. Select "ENTER" to return the display to the "MENU" screen.
        Fig 5: Screen Display - STEER ANGLE ADJ ECU VGRS
        G04950175Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. CHECK MASTER WARNING LIGHT 
      1. Confirm that the master warning light is off.
      2. Turn the power switch OFF.
      3. Disconnect the Intelligent tester from the DLC3.
      4. Turn the power switch ON (IG).
      5. Confirm that the master warning light is operating normally.
    4. CHECK STEERING WHEEL OPERATION 
      1. Turn the power switch ON (READY).
      2. Perform the steering angle sensor initialization (see INITIALIZATION  ).
      3. Turn the steering wheel from lock to lock and check that it rotates approximately 2.7 turns
      4. Drive the vehicle and confirm that the steering wheel is centered.

      NEXT: END 

  3. VGRS SYSTEM CALIBRATION PROCEDURE (USING TECHSTREAM) 
    1. FACE TIRES STRAIGHT AHEAD 
      NOTE: Drive the vehicle to confirm that the steering wheel is centered.
    2. PERFORM VGRS SYSTEM CALIBRATION 
      1. Connect Techstream to the DLC3.
      2. Turn the power switch ON (IG)
      3. Turn the tester on
      4. Enter the menu items in this order. Chassis / VGRS / Utility / Steering Angle Adjust
      5. Perform the following procedures displayed on the tester
    3. CHECK MASTER WARNING LIGHT 
      1. Confirm that the master warning light is off
      2. Turn the power switch OFF
      3. Disconnect Techstream from the DLC3
      4. Turn the power switch ON (IG).
      5. Confirm that master warning light is operating normally.
    4. CHECK STEERING WHEEL OPERATION 
      1. Turn the power switch ON (READY)
      2. Perform the steering angle sensor initialization (see INITIALIZATION  )
      3. Turn the steering wheel from lock to lock and check that it rotates approximately 2.7 turns.
      4. Drive the vehicle and confirm that the steering wheel is centered.

      NEXT: END 

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