DTC B1771: Passenger Side Buckle Switch Circuit Malfunction [09/2022 - 11/2022]: Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2025 Toyota GR Corolla, 2025 Toyota Corolla, 2024 Toyota GR Corolla, 2024 Toyota Corolla, and 2023 Toyota GR Corolla. However, it is still accessible from the selected car via links, so may be relevant.

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

DTC B1771 is stored when a malfunction is detected in the front passenger side buckle switch circuit.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B1771	Passenger Side Buckle Switch Circuit Malfunction	The occupant detection ECU detects a line short, short to ground or B+, or an open in the front passenger side buckle switch circuit. Front passenger side buckle switch malfunction Occupant detection ECU malfunction	Front seat wire RH Front passenger side buckle switch (Front seat inner belt assembly RH) Occupant detection ECU