Toyota 4Runner manuals

Toyota 4Runner: 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)

See page

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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