Toyota 4Runner: Diagnostic Trouble Code Chart

Toyota 4Runner Service Manual / Vehicle Interior / Supplemental Restraint Systems / Occupant Classification System / Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART

HINT:

When DTC B1650/32 is stored as a result of troubleshooting for the airbag system, perform troubleshooting for the occupant classification system as shown in the chart below.
Use the Techstream to read and clear the DTCs of the occupant classification ECU, otherwise the DTCs cannot be read and cleared.

Occupant Classification System

DTC Code	Detection Item	Trouble Area	Passenger Airbag ON/OFF Indicator (OFF)
B1771	Passenger Side Buckle Switch Circuit Malfunction	- Front seat inner belt RH (Front passenger side buckle switch) - Front seat wire RH - Occupant classification ECU	On
B1780	Front Occupant Classification Sensor LH Circuit Malfunction	- Separate type front seat cushion spring RH (Front occupant classification sensor LH) - Front seat wire RH - Occupant classification ECU	On
B1781	Front Occupant Classification Sensor RH Circuit Malfunction	- Separate type front seat cushion spring RH (Front occupant classification sensor RH) - Front seat wire RH - Occupant classification ECU	On
B1782	Rear Occupant Classification Sensor LH Circuit Malfunction	- Separate type front seat cushion spring RH (Rear occupant classification sensor LH) - Front seat wire RH - Occupant classification ECU	On
B1783	Rear Occupant Classification Sensor RH Circuit Malfunction	- Separate type front seat cushion spring RH (Rear occupant classification sensor RH) - Front seat wire RH - Occupant classification ECU	On
B1785	Front Occupant Classification Sensor LH Collision Detection	- Separate type front seat cushion spring RH (Front occupant classification sensor LH) - Occupant classification ECU	On
B1786	Front Occupant Classification Sensor RH Collision Detection	- Separate type front seat cushion spring RH (Front occupant classification sensor RH) - Occupant classification ECU	On
B1787	Rear Occupant Classification Sensor LH Collision Detection	- Separate type front seat cushion spring RH (Rear occupant classification sensor LH) - Occupant classification ECU	On
B1788	Rear Occupant Classification Sensor RH Collision Detection	- Separate type front seat cushion spring RH (Rear occupant classification sensor RH) - Occupant classification ECU	On
B1790	Center Airbag Sensor Assembly Communication Circuit Malfunction	- Floor wire - Front seat wire RH - Occupant classification ECU - Center airbag sensor	On
B1793	Occupant Classification Sensor Power Supply Circuit Malfunction	- Separate type front seat cushion spring RH (Occupant classification sensors) - Front seat wire RH - Occupant classification ECU	On
B1794	Open in Occupant Classification ECU Battery Positive Line	- Harness or connector - Occupant classification ECU	On
B1795	Occupant Classification ECU Malfunction	Occupant classification ECU	On
B1796	Sleep Operation Failure of Occupant Classification ECU	Occupant classification ECU	On

Sleep Operation Failure of Occupant Classification ECU (B1796)

DESCRIPTION During sleep mode, the occupant classification ECU monitors the condition of each sensor while the ignition switch is off. In this mode, if the occupant classification ECU detects an ...

Occupant Classification Sensor Power Supply Circuit Malfunction (B1793)

DESCRIPTION The occupant classification sensor power supply circuit consists of the occupant classification ECU and occupant classification sensors. DTC B1793 is stored when a malfunction is detec ...

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