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.
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 |
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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 |
|
Test yourself
A quick Toyota 4Runner quiz: every answer comes with an explanation and a link to the manual page.