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Home >> Lexus >> 2007 >> RX 400h AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 320 (Supplemental Restraint System) >> Occupant Classification System >> DTC B1781 Front Occupant Classification Sensor RH Circuit Malfunction >> Description
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DTC B1781 Front Occupant Classification Sensor RH Circuit Malfunction: Description

WARNING: This page is about a different car, the 2008 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

The front occupant classification sensor RH circuit consists of the occupant classification ECU and the front occupant classification sensor RH.

DTC B1781 is recorded when a malfunction is detected in the front occupant classification sensor RH circuit.

DTC TROUBLE DETECTION CONDITION

DTC No. DTC Detection Condition Trouble Area
B1781 When one of following conditions is met:
  • Occupant classification ECU detects line short signal, open signal, short to ground signal or short to B+ signal in the front occupant classification sensor RH circuit for 2 seconds
  • Front occupant classification sensor RH malfunction
  • Occupant classification ECU malfunction
  • Front seat wire RH
  • Front seat RH (Front occupant classification sensor RH)
  • Occupant classification ECU