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Home >> Lexus >> 2008 >> IS 250 AWD >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication >> Can Communication System >> Seat Belt Control ECU Communication Stop Mode >> Inspection Procedure

Inspection Procedure

  1. CHECK OPEN IN CAN BUS WIRE (SEAT BELT CONTROL ECU BRANCH LINE) 
    1. Turn the engine switch off.
    2. Disconnect the seat belt control ECU connector (Q38).
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION CHART

      Tester Connection Condition Specified Value
      Q38-4 (CANH) - Q38-6 (CANL) Engine switch off 54 to 69 Ω
      Fig 1: Identifying Seat Belt Control ECU Connector Q38
      G05828584Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE SEAT BELT CONTROL ECU BRANCH WIRE OR CONNECTOR (CAN-H, CAN-L) 

      OK: Go to Next Step 

  2. CHECK WIRE HARNESS (IG1, PGND) 
    1. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION CHART

      Tester Connection Condition Specified Value
      Q38-18 (PGND) - Body ground Always Below 1 Ω
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFICATION CHART

      Tester Connection Condition Specified Value
      Q38-3 (IG1) - Body ground Engine switch on (IG) 10 to 14 V
      Fig 2: Identifying Seat Belt Control ECU Connector Q38 (IG1, PGND)
      G05828585Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: REPLACE SEAT BELT CONTROL ECU 

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