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Home >> Lexus >> 2002 >> SC 430 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Gauges & Instrument Panels >> Combination Meter - Diagnosis >> Warning Buzzer Does Not Sound (Open Door Warning, WIETAL Top Operating Warning) >> Inspection Procedure

Inspection Procedure

  1. CHECK BUZZER (OPEN DOOR WARNING, METAL TOP OPERATING WARNING) 
    1. Check that the all of the warning buzzers sound.
    INSPECTION PROCEDURE

    A All buzzers do not sound
    B Open door warning buzzer does not sound (Driver side)
    C Open door warning buzzer does not sound (Passenger side)
    1. B: GO TO STEP 2 
    2. C: GO TO STEP   6 
    3. D: GO TO RETRACTABLE HARDTOP SYSTEM 
    4. A: REPLACE COMBINATION METER ASSY 
  2. INSPECT MULTIPLEX NETWORK DOOR ECU FRONT LH 
    1. Check voltage.
      1. Remove the driver door ECU with connector with still connected.
      2. Measure the voltage between terminal CTY of driver door ECU and body ground.

    Standard Voltage: 

    STANDARD VOLTAGE CHART

    Condition Voltage (V)
    Driver door is closed 10 - 14
    Driver door is opened Below 1.0
    Fig 1: Measuring Voltage Between Terminal CTY Of Driver Door ECU & Body Ground
    G03386930Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: GO TO STEP   5 
    2. OK: GO TO NEXT STEP 
  3. INSPECT FRONT DOOR COURTESY LAMP SWITCH ASSY 
    1. NG: REPLACE FRONT DOOR COURTESY LAMP SWITCH ASSY 
    2. OK: GO TO NEXT STEP 
  4. CHECK HARNESS AND CONNECTOR(BETWEEN DRIVER DOOR ECU AND DOOR COURTESY SWITCH LH) 
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: CHECK AND REPLACE MULTIPLEX NETWORK DOOR ECU FRONT LH 
  5. CHECK THAT MALFUNCTION DISAPPEAR A KNOWN GOOD COMBINATION METER IS INSTALLED 
    1. Check that malfunction disappear when a know 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 DOOR ECU FRONT LH 
  6. INSPECT MULTIPLEX NETWORK DOOR ECU FRONT RH 
    1. Check voltage.
      1. Remove the passenger door ECU with connected with still connected.
      2. Measure the voltage between terminal CTY of passenger door ECU and body ground.

    Standard Voltage: 

    STANDARD VOLTAGE CHART

    Condition Voltage (V)
    Passenger door is closed 10 - 14
    Passenger door is opened Below 1.0
    Fig 2: Measuring Voltage Between Terminal CTY Of Passenger Door ECU & Body Ground
    G03386931Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: Go to step   9 
    2. OK: Go to next step 
  7. INSPECT FRONT DOOR COURTESY LAMP SWITCH ASSY (PASSENGER SIDE) 
    1. NG: REPLACE FRONT DOOR COURTESY LAMP SWITCH ASSY 
    2. OK: GO TO NEXT STEP 
  8. CHECK HARNESS AND CONNECTOR (BETWEEN PASSENGER DOOR ECU AND DOOR COURTESY SWITCH RH) 
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: GO TO NEXT STEP 
  9. CHECK THAT MALFUNCTION DISAPPEAR A KNOWN GOOD COMBINATION METER IS INSTALLED 
    1. Check that malfunction disappear when a know 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 DOOR ECU FRONT RH 
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