Toyota Tundra Service Manual: Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART

HINT:

  • When DTC B1650/32 is detected 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 DTC 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 (Passenger side buckle switch)

- Front seat wire RH

- Occupant classification ECU

ON

B1780

Front Occupant Classification Sensor LH Circuit Malfunction

- Front seat frame with adjuster RH (Front occupant detection sensor LH)

- Front seat wire RH

- Occupant classification ECU

ON

B1781

Front Occupant Classification Sensor RH Circuit Malfunction

- Front seat frame with adjuster RH (Front occupant detection sensor RH)

- Front seat wire RH

- Occupant classification ECU

ON

B1782

Rear Occupant Classification Sensor LH Circuit Malfunction

- Front seat frame with adjuster RH (Rear occupant detection sensor LH)

- Front seat wire RH

- Occupant classification ECU

ON

B1783

Rear Occupant Classification Sensor RH Circuit Malfunction

- Front seat frame with adjuster RH (Rear occupant detection sensor RH)

- Front seat wire RH

- Occupant classification ECU

ON

B1785

Front Occupant Classification Sensor LH Collision Detection

- Front seat frame with adjuster RH (Front occupant detection sensor LH)

- Occupant classification ECU

ON

B1786

Front Occupant Classification Sensor RH Collision Detection

- Front seat frame with adjuster RH (Front occupant detection sensor LH)

- Occupant classification ECU

ON

B1787

Rear Occupant Classification Sensor LH Collision Detection

- Front seat frame with adjuster RH (Rear occupant detection sensor LH)

- Occupant classification ECU

ON

B1788

Rear Occupant Classification Sensor RH Collision Detection

- Front seat frame with adjuster RH (Rear occupant detection sensor RH)

- Occupant classification ECU

ON

B1790

Center Airbag Sensor Assembly Communication Circuit Malfunction

- No. 2 floor wire

- Front seat wire RH

- Occupant classification ECU

- Center airbag sensor

ON

B1793

Occupant Classification Sensor Power Supply Circuit Malfunction

- Front seat frame with adjuster RH (Occupant detection sensors)

- Front seat wire RH

- Occupant classification ECU

ON

B1794

Open in Occupant Classification ECU Battery Positive Line

- Harness and 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

    Diagnosis System

    Dtc Check / Clear

    See More:

    Toyota Tundra Service Manual > Can Communication System: Check Bus 1 Lines for Short Circuit
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