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Home >> Lexus >> 2005 >> GX 470 >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Key Reminder Warning System - Diagnostics >> Key Reminder Buzzer Does Not Sound >> Inspection Procedure >> When Using Hand-Held Tester:

When Using Hand-Held Tester:

  1. READ VALUE OF HAND-HELD TESTER (COURTESY LAMP SWITCH) 
    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch ON and push the hand-held tester main switch ON.
    3. Select the item "D DOR CTY SW" in the DATA LIST and read its value displayed on the hand-held tester.

      Standard: 

      • ON: Driver side door is open 
      • OFF: Driver side door is closed 
    1. OK: Go to step   4 . 
    2. NG: Go to next step. 
  2. INSPECT FRONT DOOR COURTESY LAMP SWITCH ASSY (DRIVER SIDE) 
    1. Remove the courtesy lamp switch.
    2. Check the switch continuity.

      Standard: 

      FRONT DOOR COURTESY LAMP SWITCH ASSY (DRIVER SIDE)

      Terminal No. Condition Specified Condition
      1 <=> Body ground Switch Free Continuity
      1 <=> Body ground Switch Pushed No continuity
      Fig 1: Inspecting Front Door Courtesy Lamp Switch Assy (Driver Side)
      G02965183Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE FRONT DOOR COURTESY LAMP SWITCH ASSY 
    2. OK: Go to next step. 
  3. CHECK WIRE HARNESS (INSTRUMENT PANEL JUNCTION BLOCK ASSY (BODY ECU) <->COURTESY LAMP SWITCH) 
    1. Disconnect the B4 J/B connector.
    2. Disconnect the D12 courtesy lamp switch connector.
    3. Check the continuity between the wire harness side connectors.

      Standard: 

      INSTRUMENT PANEL JUNCTION BLOCK ASSY (BODY ECU) <->COURTESY LAMP SWITCH

      Symbols (Terminal No.) Specified Condition
      DCTY (B4-23) <=> + (D12-1) Continuity
      Fig 2: Checking Wire Harness (Instrument Panel Junction Block Assy (Body ECU <-> Courtesy Lamp Switch)
      G02965184Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: Go to next step. 
  4. CHECK BUZZER (COMBINATION METER) (SEE  PROBLEM SYMPTOMS TABLE  ) 
    1. NG: GO TO COMBINATION METER SYSTEM (SEE  PROBLEM SYMPTOMS TABLE  ) 
    2. OK: Go to next step. 
  5. READ VALUE OF HAND-HELD TESTER (KEY UNLOCK WARNING SWITCH) 
    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch ON and push the hand-held tester main switch ON.
    3. Select the item "KEY UNLK WRN SW" in the DATA LIST and read its value displayed on the hand-held tester.

      Standard: 

      • ON: The key is in the ignition key cylinder 
      • OFF: No key is in the ignition key cylinder 
    1. OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSY 
    2. NG: Go to next step. 
  6. INSPECT UNLOCK WARNING SWITCH ASSY 
    1. Remove the unlock warning switch assy.
    2. Check the switch continuity.

      Standard: 

      UNLOCK WARNING SWITCH ASSY

      Terminal No. Condition Specified Condition
      1 <=> 2 Free No continuity
      1 <=> 2 Pushed Continuity
      Fig 3: Inspecting Unlock Warning Switch Assy
      G02965185Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE UNLOCK WARNING SWITCH ASSY 
    2. OK: Go to next step. 
  7. CHECK WIRE HARNESS (INSTRUMENT PANEL JUNCTION BLOCK ASSY (BODY ECU) <=> UNLOCK WARNING SWITCH ASSY) (UNLOCK WARNING SWITCH <=> BODY GROUND) 
    1. Disconnect the B5 J/B connector.
    2. Disconnect the K3 warning switch connector.
    3. Check the continuity between the wire harness side connectors.

      Standard: 

      INSTRUMENT PANEL JUNCTION BLOCK ASSY (BODY ECU) <=> UNLOCK WARNING SWITCH ASSY

      Symbols (Terminal No.) Specified Condition
      KSW (B5-14) <=> + (K3-2) Continuity
    4. Check the continuity between the K3 warning switch connector and body ground.

      Standard: 

      UNLOCK WARNING SWITCH <=> BODY GROUND

      Terminal No. Specified Condition
      K3-1 <=> Body ground Continuity
      Fig 4: Checking Wire Harness (Instrument Panel Junction Block Assy (Body ECU) <-> Unlock Warning Switch Assy) (Unlock Warning Switch <-> Body Ground)
      G02965186Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSY 
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