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DTC B1771 Passenger Side Buckle Switch Circuit Malfunction: Description

The passenger side buckle switch circuit consists of the occupant classification ECU and the front seat inner belt assembly RH.

DTC B1771 is recorded when a malfunction is detected in the passenger side buckle switch circuit. Troubleshoot DTC B1771 first when DTCs B1771 and B1795 are output simultaneously.

DTC DETECTION CONDITION CHART

DTC No. DTC Detecting Condition Trouble Area
B1771
  • The occupant classification ECU 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 passenger side buckle switch circuit for 2 seconds.
  • Passenger side buckle switch malfunction
  • Occupant classification ECU malfunction
  • Front seat inner belt assembly RH (Back switch RH)
  • Occupant classification ECU
  • Floor wire ((1))
  • Instrument panel wire No. 3 ((2))
(1) w/ Side and curtain shield airbag
(2) w/o Side and curtain shield airbag
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