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Home >> Lexus >> 2003 >> ES 300 >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Key Unlock Warning System - Diagnosis >> Unlock Warning Switch Circuit >> Inspection Procedure

Inspection Procedure

  1. PERFORM ACTIVE TEST BY HAND-HELD TESTER 
    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch ON, driver's door close and push the hand-held tester main SW ON.
    3. Select the item "KEY REMND BUZZER" in the ACTIVE TEST, and operate the key reminder buzzer.

      OK: 

      Tuns Key reminder buzzer ON 

    1. NG : Go to step 6. 
    2. OK : Go to next step. 
  2. READ VALUE OF HAND-HELD TESTER 
    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch ON and push the hand-held tester main SW ON.
    3. Select the item "KEY UNLK WRN SW" in the DATA LIST and read its value displayed on the hand-held tester.

      OK: 

      ON: The key is in the IG key cylinder 

      OFF: The key is not in the IG key cylinder 

    1. OK : GO TO FLOWCHART (See  DOOR COURTESY SWITCH ASSY (FOR FRONT DOOR) CIRCUIT   ) 
    2. NG : Go to next step. 
  3. INSPECT UN-LOCK WARNING SWITCH ASSY 
    1. Remove the key unlock warning switch assy.
    2. Inspect the key unlock warning switch assy continuity.

      Standard: 

      TERMINAL CHART

      Terminal No. Condition Specified condition
      1 <=> 2 Free No continuity
      Push Continuity
      Fig 1: Inspecting Key Unlock Warning Switch Assy Continuity
      G03372918Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPLACE UN-LOCK WARNING SWITCH ASSY 
    2. OK : Go to next step. 
  4. CHECK WIRE HARNESS 
    1. Disconnect the B4 body ECU and U1 unlock warning switch connectors.
    2. Check the continuity between the body ECU wire harness side connector and unlock warning switch wire harness side connector.
      Fig 2: Checking Continuity Between Body ECU Wire Harness Side Connector And Unlock Warning Switch
      G03372919Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TERMINAL CHART

      Symbols (Terminal No.) (Body ECU <=> Unlock warning switch) Condition Specified condition
      KSW(B4-19)<=> (U1-2) Constant Continuity
    1. NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK : Go to next step. 
  5. CHECK WIRE HARNESS 
    1. Disconnect the U1 unlock warning switch connector.
    2. Check the continuity between terminal 1 and the body ground.

      Standard: 

      TERMINAL CHART

      Condition Specified condition
      Constant Continuity
      Fig 3: Identifying Wire Harness Side
      G03372920Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK : REPLACE DRIVER SIDE JUNCTION BLOCK ASSY 
    2. NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 
  6. CHECK WIRE HARNESS 
    1. Disconnect the B4 body ECU and C8 meter ECU connectors.
    2. Check the continuity between the body ECU wire harness side connector and the meter ECU wire harness side connector.
      Fig 4: Checking Continuity Between Body ECU Wire Harness Side Connector And Meter ECU Wire Harness Side Connector
      G03372921Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TERMINAL CHART

      Symbols (Terminal No.) (Body ECU <=> Meter ECU) Specified condition
      KW(B4-1) <=> KW(C8-15) Continuity
    1. NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK : GO TO METER AND GAUGE SYSTEM (See  BUZZER DOES NOT SOUND (KEY REMINDER WARNING, SEAT BELT WARNING )  ) 
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