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Home >> Lexus >> 2002 >> SC 430 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Gauges & Instrument Panels >> Combination Meter - Diagnosis >> Seat Belt Warning Lamp For Driver's Seat Does Not Operate >> Inspection Procedure

Inspection Procedure

  1. DO ACTIVE TEST OF OBD II SCAN TOOL OR LEXUS HAND-HELD TESTER 
    1. Check driver's seat belt warning operation.
      1. Connect the OBD II scan tool or LEXUS hand-held tester to DLC3.
      2. Turn the ignition switch ON and push the OBD II scan tool or LEXUS hand-held tester main switch ON.
      3. Select the ACTIVE TEST mode on the OBD II scan tool or LEXUS hand-held tester.
      4. Check that the driver's seat belt warning operation.
    1. NG: CHECK AND REPLACE COMBINATION METER ASSY 
    2. OK: GO TO NEXT STEP 
  2. READ VALUE OF OBD U SCAN TOOL OR LEXUS HAND-HELD TESTER 
    1. Check output valve of driver's side buckle switch.
      1. Connect the OBD II scan tool or LEXUS hand-held tester to DLC3.
      2. Turn the ignition switch ON and push the OBD II scan tool or LEXUS hand-held tester main switch ON.
      3. Select the DATA LIST mode on the OBD II scan tool or LEXUS hand-held tester.
      4. Check that the driver's side buckle switch using DATA LIST.
    1. OK: GO TO STEP   5 
    2. NG: GO TO NEXT STEP 
  3. INSPECT FRONT SEAT INNER BELT ASSY LH 
    1. Check continuity.
      1. Disconnect the connector of front seat belt inner belt LH.
      2. Check continuity between terminal 2 and 4 when buckle switch condition as shown in the chart below.
    CONTINUITY CHART

    Condition Continuity
    Seat belt unfastened Continuity
    Seat belt fastened No continuity
    Fig 1: Checking Continuity Between Terminal 2 & 4
    G03386933Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE FRONT SEAT INNER BELT ASSY LH 
    2. OK: GO TO NEXT STEP 
  4. CHECK HARNESS AND CONNECTOR 
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: CHECK AND REPLACE MULTIPLEX NETWORK BODY ECU 
  5. CHECK THAT MALFUNCTION DISAPPEAR A KNOWN GOOD COMBINATION METER IS INSTALLED 
    1. Check that malfunction disappear when a known good combination meter is installed.
    MALFUNCTION CHART

    A Malfunction does not disappear
    B Malfunction disappear
    1. B: CHECK AND REPLACE COMBINATION METER ASSY 
    2. A: CHECK AND REPLACE MULTIPLEX NETWORK BODY ECU 
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