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Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR DTC (BLINKING PATTERN) 
    1. Turn the power switch from ON (IG) to OFF
    2. Turn the power switch ON (IG) and wait for 10 seconds.
    3. Check for the DTC again and wait for 20 seconds (see DTC CHECK / CLEAR ).

      OK: DTC 5-2 is not output. 

      NG:  Go to step  2

      OK: CLEAR HISTORIC DTC  (See DTC CHECK / CLEAR )

  2. CHECK SUPPLEMENTAL RESTRAINT SYSTEM 
    1. Check for DTC using the intelligent tester or Techstream (see DTC CHECK / CLEAR ).

    Result 

    RESULT CHART

    Result Proceed to
    DTC related to supplemental restraint system present A
    No DTC B

    A: GO TO SUPPLEMENTAL RESTRAINT SYSTEM  (See HOW TO PROCEED WITH TROUBLESHOOTING )

    B: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (MAYDAY ECU - CENTER AIRBAG SENSOR) 
    1. Disconnect the cable from the negative (-) battery terminal and wait for 90 seconds
      CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
      NOTE:
      • After the power switch is turned OFF, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the power switch OFF, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.
      • When disconnecting the cable, some systems need to be initialized after the cable is reconnected (see INITIALIZATION ).
    2. Disconnect the R24 ECU connector
    3. Disconnect the L73 airbag sensor connector.
    4. Measure the resistance according to the value(s) in the table below
    Fig 1: Checking Harness And Connector (Mayday ECU - Center Airbag Sensor)
    G05784493Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard resistance 

    TESTER CONNECTION SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    R24-16 (GSW) - L73-24 (GSW3) Always Below 1 Ω
    R24-16 (GSW) or L73-24 (GSW3) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR THEN CLEAR HISTORIC DTC 

    OK: REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION 

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