Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Lexus >> 2003 >> LS 430 >> Repair and Diagnosis >> External Pages >> Different car >> Section 489 (Key Reminder Warning System - Diagnostics) >> Key Reminder Buzzer Does Not Sound >> Inspection Procedure >> When using hand-held tester:

When using hand-held tester:

WARNING: This page is about a different car, the 2004 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
  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 

    OK: Go To Step   4 

    NG: Go To Next Step 

  2. INSPECT COURTESY LAMP SWITCH (DRIVER SIDE) 
    1. Remove the courtesy lamp switch.
    2. Check the switch continuity.
    Fig 1: Inspecting Courtesy Lamp Switch (Driver Side)
    G02835466Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 2: STANDARD
    G02835467Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE COURTESY LAMP SWITCH 

    OK: Go To Next Step 

  3. CHECK WIRE HARNESS (BODY ECU <=> COURTESY LAMP SWITCH) 
    1. Disconnect the D12 door courtesy lamp switch (driver side) and B5 ECU connectors.
      2. Fig 3: D12 door courtesy lamp switch (driver side) and B5 ECU connectors
      G02835468Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the continuity between the wire harness side connectors.
    STANDARD

    Symbols (Terminal No.) Specified Condition
    DCTY (B5-23)<=> (D12-1) Continuity

    NG: REPAIR OR REPLACE WIRE HARNESS 

    OK: Go To Next Step 

  4. CHECK BUZZER (COMBINATION METER) See  PROBLEM SYMPTOMS TABLE 

    NG: GO TO COMBINATION METER SYSTEM See  PROBLEM SYMPTOMS TABLE 

    OK: Go To Next Step 

  5. READ VALUE OF HAND-HELD TESTER (KEY UN-LOCK WARNING SW) 
    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 

    OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSY 

    NG: Go To Next Step 

  6. INSPECT UN-LOCK WARNING SWITCH ASSY 
    1. Remove the un-lock warning switch.
    2. Check the switch continuity.
    Fig 4: Inspecting Un-Lock Warning Switch Continuity
    G02835469Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 5: STANDARD
    G02835470Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE UN-LOCK WARNING SWITCH ASSY 

    OK: Go To Next Step 

  7. CHECK WIRE HARNESS (BODY ECU <=> UN-LOCK WARNING SWITCH ASSY) (UN-LOCK WARNING SWITCH <=> BODY GROUND) 
    1. Disconnect the B6 ECU connector.
      2. Fig 6: Identifying Connectors
      G02835471Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the K3 warning switch connector.
    3. Check the continuity between the wire harness side connectors.
      STANDARD

      Symbols (Terminal No.) Specified Condition
      KSW (B6-14)<=> (K3-2) continuity
    4. Check the continuity between the K3 warning switch connector and body ground.
    STANDARD

    Symbols (Terminal No.) Specified Condition
    K3-1 <=> Body ground continuity

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSY 

scientia non olet · About Mike's Workshop Manuals