2002 Lexus LX 470FACTORY OEM SERVICE PROCEDURE

Motor Shift Control System: Inspection

  1. INSPECT SWITCH POSITION 
    1. Start the engine, and shift the transfer shift lever to the "H" position.
    2. Check that the center diff. indicator light comes on when the switch is in "ON" position. Check that the light goes off when the switch is in "OFF" position.
      Fig 1: Inspecting Switch Position
      G03322392Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT SHIFT LEVER POSITION 
    1. Start the engine, and turn the center diff. lock switch to OFF.
    2. Check that the center diff. indicator light comes on when the transfer shift lever is shifted to the "L" position. Check that the light goes off when the lever is shifted to the "N" or "H" position.
      Fig 2: Inspecting Shift Lever Position
      G03322393Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT CENTER DIFF. LOCK CONTROL RELAY 
      Fig 3: Identifying Center Diff Lock Control Relay
      G03322394Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Check that continuity exists between each terminal, as shown in the chart.
      CONTINUITY EXISTS TERMINAL CHART

      Tester connected terminal number Specified condition
      1 - 2 Continuity
      2 - 4 Continuity
      6 - 7 (1)
      (1) There is a diode between the terminals 6 and 7.

      If no continuity exists, check that continuity exists when changing the position of (+) probe for the position of negative (-) probe of tester.

    2. Apply battery positive voltage between each terminal and check that continuity exists between each terminal, as shown in the chart.
      CONTINUITY EXISTS TERMINAL CHART

      Battery voltage applied terminal Tester connected terminal number Specified condition
      6 (+) - 5 (-) 1 - 3
      1 - 2      		 Continuity
      No continuity
      7 (+) - 2 (-) 9 - 10 No continuity
      9 (+) - 10 (-) 3 - 4
      2 - 4      		 Continuity
      No continuity

      If continuity is not as specified, replace the relay.

  4. INSPECT ACTUATOR OPERATION 
    1. Raise up the front wheels, place the stopper under the rear wheels to block them, and pull up the parking brake.
    2. Disconnect the connector of the actuator and connect it to the relay using wire.
      Fig 4: Identifying Actuator Relay Wire Connection
      G03322395Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check that the front propeller shaft can be rotated by hand.
      INSPECTION CHART

      Inspection Item Standard
      Center Diff.
      Free --> Lock      		 Front propeller shaft cannot be rotated.
      Center Diff.
      Lock --> Free      		 Front propeller shaft can be rotated.
      NOTE: When inspecting the operation described above, use a heater main relay.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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