2004 Lexus GX 470FACTORY OEM SERVICE PROCEDURE

Center Diff. Lock System: Inspection

  1. INSPECT H4 (Differential lock "FREE") <--> H4 (Differential lock "LOCK") SHIFT 
    1. Start the engine, and the differential lock switch is in "OFF" position.
    2. Operate the transfer shift lever to "H4" position.
    3. Check that the center diff. lock indicator light comes on after pressing the differential lock switch for 2 seconds. Check that the center diff. lock indicator light goes off after pressing the differential lock switch for 2 seconds.
    Fig 1: Checking Center Diff Lock Indicator Light Comes On After Pressing Differential Lock Switch
    G00921368Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT L4 (Differential lock "FREE") <--> L4 (Differential lock "LOCK") SHIFT 
    1. Start the engine, and differential lock switch is in "OFF" position.
    2. Operate the transfer shift lever to "L4" position.
    3. Check that the center diff. lock indicator light comes on after pressing the differential lock switch for 2 seconds. Check that the center diff. lock indicator light goes off after pressing the differential lock switch for 2 seconds.
    Fig 2: Checking That Center Diff Lock Indicator Light Comes On After Pressing Differential Lock Switch
    G00921369Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT CENTER DIFFERENTIAL LOCK SWITCH CONTINUITY 
    1. Remove the instrument panel finish lower panel sub-assy.
    2. Remove the differential lock switch from the instrument panel finish lower sub-assy.
    3. Inspect the continuity between the each terminal.
      Fig 3: Continuity Check Table
      G00921370Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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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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