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Home >> Lexus >> 2009 >> LX 570 >> Repair and Diagnosis (Single Page) >> Restraints >> Air Bag, SRS >> Occupant Classification System (Diagnostic Codes) >> Occupant Classification System >> DTC B1790: Center Airbag Sensor Assembly Communication Circuit Malfunction >> Description
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DTC B1790: Center Airbag Sensor Assembly Communication Circuit Malfunction: Description

The center airbag sensor communication circuit consists of the occupant classification ECU and the center airbag sensor.

DTC B1790 is stored when a malfunction is detected in the center airbag sensor communication circuit.

DTC Code DTC Detection Condition Trouble Area
B1790 When one of the following conditions is met:
  • The occupant classification ECU receives a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the center airbag sensor circuit for 2 seconds.
  • A center airbag sensor malfunction.
  • An occupant classification ECU malfunction.
  • No. 2 floor wire
  • Front seat wire RH
  • No. 1 seat cushion assembly (occupant classification ECU)
  • Center airbag sensor assembly

HINT: 

When DTC B1650 is stored as a result of troubleshooting for the "Airbag System", check the DTCs stored in the occupant classification ECU. When DTC B1790 is output, perform troubleshooting for it first.