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Home >> Lexus >> 2011 >> LX 570 >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System (Diagnostic Codes (B1000/31 - B1662/45)) >> Airbag System >> DTC B1642/81: Lost Communication with Side Satellite Sensor Bus RH; DTC B1647/82: Lost Communication with Side Satellite Sensor Bus LH (08/2011 - ) >> Description

DTC B1642/81: Lost Communication with Side Satellite Sensor Bus RH; DTC B1647/82: Lost Communication with Side Satellite Sensor Bus LH (08/2011 - ): Description

The circuit for the side collision sensor LH or RH (to determine deployment of the front seat airbag LH or RH, rear seat side airbag LH or RH, and curtain shield airbag LH or RH) is composed of the center airbag sensor, side airbag sensor LH or RH, and rear airbag sensor LH or RH.

The side airbag sensor LH or RH, and rear airbag sensor LH or RH detect impacts to the vehicle and send signals to the center airbag sensor to determine if the airbag should be deployed.

DTC B1642/81 or B1647/82 is stored when a malfunction is detected in the circuit for the side collision sensor LH or RH (to determine deployment of the front seat airbag LH or RH, rear seat side airbag LH or RH and curtain shield airbag LH or RH).

DTC Code DTC Detection Condition Trouble Area
B1642/81 When one of the following conditions is met:
  • The center airbag sensor receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the circuit for the side collision sensor RH (to determine deployment of the front seat airbag RH and curtain shield airbag RH) for 2 seconds.
  • A side airbag sensor RH malfunction.
  • A rear airbag sensor RH malfunction.
  • A center airbag sensor malfunction.
  • No. 2 floor wire
  • Front door wire RH
  • Side airbag sensor RH
  • Rear airbag sensor RH
  • Center airbag sensor assembly
B1647/82 When one of the following conditions is met:
  • The center airbag sensor receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the circuit for the side collision sensor LH (to determine deployment of the front seat airbag LH and curtain shield airbag LH) for 2 seconds.
  • A side airbag sensor LH malfunction.
  • A rear airbag sensor LH malfunction.
  • A center airbag sensor malfunction.
  • Floor wire
  • Front door wire LH
  • Side airbag sensor LH
  • Rear airbag sensor LH
  • Center airbag sensor assembly
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