DESCRIPTION
The passenger side buckle switch circuit consists of the occupant classification ECU and front seat inner belt assembly RH.
DTC B1771 is recorded when a malfunction is detected in the passenger side buckle switch circuit.
Troubleshoot DTC B1771 first if DTCs B1771 and B1795 are output simultaneously.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1771 | The occupant classification ECU receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the passenger side buckle switch circuit for 2 seconds. Passenger side buckle switch malfunction Occupant classification ECU malfunction | Front seat inner belt assembly RH (Passenger side buckle switch) Occupant classification ECU Front seat wire RH (for Power seat) No. 2 Floor wire (for Manual seat) |
HINT
When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1771 is output, perform troubleshooting for the DTC.
Scheme 59
The front occupant classification sensor LH circuit consists of the occupant classification ECU and front occupant classification sensor LH.
DTC B1780 is recorded when a malfunction is detected in the front occupant classification sensor LH circuit.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1780 | The occupant classification ECU receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the front occupant classification sensor LH circuit for 2 seconds. Front occupant classification sensor LH malfunction Occupant classification ECU malfunction | Front seat assembly RH (Front occupant classification sensor LH) Occupant classification ECU Front seat wire RH |
HINT
When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1780 is output, perform troubleshooting for the DTC.
Scheme 60
The front occupant classification sensor RH circuit consists of the occupant classification ECU and front occupant classification sensor RH.
DTC B1781 is recorded when a malfunction is detected in the front occupant classification sensor RH circuit.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1781 | The occupant classification ECU receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the front occupant classification sensor RH circuit for 2 seconds. Front occupant classification sensor RH malfunction Occupant classification ECU malfunction | Front seat assembly RH (Front occupant classification sensor RH) Occupant classification ECU Front seat wire RH |
HINT
When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1781 is output, perform troubleshooting for the DTC.
Scheme 61
The rear occupant classification sensor LH circuit consists of the occupant classification ECU and rear occupant classification sensor LH.
DTC B1782 is recorded when a malfunction is detected in the rear occupant classification sensor LH circuit.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1782 | The occupant classification ECU receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the rear occupant classification sensor LH circuit for 2 seconds. Rear occupant classification sensor LH malfunction Occupant classification ECU malfunction | Front seat assembly RH (Rear occupant classification sensor LH) Front seat wire RH Occupant classification ECU |
HINT
When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1782 is output, perform troubleshooting for the DTC.
Scheme 62
The rear occupant classification sensor RH circuit consists of the occupant classification ECU and rear occupant classification sensor RH.
DTC B1783 is recorded when a malfunction is detected in the rear occupant classification sensor RH circuit.
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|---|---|
| B1783 | The occupant classification ECU receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the rear occupant classification sensor RH circuit for 2 seconds. Rear occupant classification sensor RH malfunction Occupant classification ECU malfunction | Front seat assembly RH (Rear occupant classification sensor RH) Occupant classification ECU Front seat wire RH |
HINT
When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1783 is output, perform troubleshooting for the DTC.
Scheme 63
DTC B1785 is output when the occupant classification ECU receives a collision detection signal sent by the front occupant classification sensor LH if an accident occurs.
DTC B1785 is also output when the front seat assembly RH is subjected to a strong impact, even if an actual accident does not occur.
However, when the occupant classification ECU outputs a collision detection signal, even if the vehicle is not in a collision, DTC B1785 can be cleared by Zero Point Calibration and Sensitivity Check.
Therefore, if DTC B1785 is output, first perform Zero Point Calibration and Sensitivity Check.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1785 | Front seat assembly RH malfunction Occupant classification ECU malfunction Front occupant classification sensor LH sensed large load | Front seat assembly RH (Front occupant classification sensor LH) Occupant classification ECU |
HINT
When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1785 is output, perform troubleshooting for the DTC.
DTC B1786 is output when the occupant classification ECU receives a collision detection signal sent by the front occupant classification sensor RH if an accident occurs.
DTC B1786 is also output when the front seat assembly RH is subjected to a strong impact, even if an actual accident does not occur.
However, when the occupant classification ECU outputs a collision detection signal, even if the vehicle is not in a collision, DTC B1786 can be cleared by Zero Point Calibration and Sensitivity Check.
Therefore, if DTC B1786 is output, first perform Zero Point Calibration and Sensitivity Check.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1786 | Front seat assembly RH malfunction Occupant classification ECU malfunction Front occupant classification sensor RH sensed large load | Front seat assembly RH (Front occupant classification sensor RH) Occupant classification ECU |
HINT
When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1786 is output, perform troubleshooting for the DTC.
DTC B1787 is output when the occupant classification ECU receives a collision detection signal sent by the rear occupant classification sensor LH if an accident occurs.
DTC B1787 is also output when the front seat assembly RH is subjected to a strong impact, even if an actual accident does not occur.
However, when the occupant classification ECU outputs a collision detection signal, even if the vehicle is not in a collision, DTC B1787 can be cleared by Zero Point Calibration and Sensitivity Check.
Therefore, if DTC B1787 is output, first perform Zero Point Calibration and Sensitivity Check.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1787 | Front seat assembly RH malfunction Occupant classification ECU malfunction Rear occupant classification sensor LH sensed large load | Front seat assembly RH (Rear occupant classification sensor LH) Occupant classification ECU |
HINT
When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1787 is output, perform troubleshooting for the DTC.
DTC B1788 is output when the occupant classification ECU receives a collision detection signal sent by the rear occupant classification sensor RH if an accident occurs.
DTC B1788 is also output when the front seat assembly RH is subjected to a strong impact, even if an actual accident does not occur.
However, when the occupant classification ECU outputs a collision detection signal, even if the vehicle is not in a collision, DTC B1788 can be cleared by Zero Point Calibration and Sensitivity Check.
Therefore, if DTC B1788 is output, first perform Zero Point Calibration and Sensitivity Check.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1788 | Front seat assembly RH malfunction Occupant classification ECU malfunction Rear occupant classification sensor RH sensed large load | Front seat assembly RH (Rear occupant classification sensor RH) Occupant classification ECU |
HINT
When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1788 is output, perform troubleshooting for the DTC.
The center airbag sensor assembly communication circuit consists of the occupant classification ECU and center airbag sensor assembly.
DTC B1790 is recorded when a malfunction is detected in the center airbag sensor assembly communication circuit.
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|---|---|
| B1790 | The occupant classification ECU receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the center airbag sensor assembly communication circuit. Occupant classification ECU malfunction Center airbag sensor assembly malfunction | Occupant classification ECU Center airbag sensor assembly Front seat wire RH (for Power seat) Floor wire No. 2 Junction connector |
Scheme 64
The occupant classification sensor power supply circuit consists of the occupant classification ECU and occupant classification sensors.
DTC B1793 is recorded when a malfunction is detected in the occupant classification sensor power supply circuit.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1793 | The occupant classification ECU receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the occupant classification sensor power supply circuit for 2 seconds. Occupant classification ECU malfunction | Front seat assembly RH (Occupant classification sensors) Occupant classification ECU Front seat wire RH |
HINT
When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1793 is output, perform troubleshooting for the DTC.
Scheme 65
This circuit consists of the occupant classification ECU and power source circuit (battery, fuse and wire harness).
DTC B1794 is recorded when a malfunction is detected in the occupant classification ECU or power source circuit.
HINT
If DTC B1794 is output after turning the ignition switch from off to ON and to off 50 times in a row when a malfunction occurs in the power circuit for the occupant classification system.
This DTC is output if a malfunction is detected even after being cleared unless the normal system code is input.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1794 | The ignition switch is turned from off to ON, hold for 10 seconds or more, and turned off again 50 times in a row when a malfunction occurs in the power circuit for the occupant classification system. Occupant classification ECU malfunction | Battery ECU-B fuse Wire harness Occupant classification ECU |
When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1794 is output, perform troubleshooting for the DTC.
Scheme 66
DTC B1795 is recorded when a malfunction is detected in the occupant classification ECU.
Troubleshoot DTC B1771 first if DTCs B1771 and B1795 are output simultaneously.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1795 | Front seat inner belt assembly RH malfunction Occupant classification ECU malfunction | Front seat inner belt assembly RH Occupant classification ECU |
HINT
When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1795 is output, perform troubleshooting for the DTC.
In sleep mode, the occupant classification ECU reads the condition of each sensor while the ignition switch is off.
In this mode, if occupant classification ECU detects an internal malfunction, DTC B1796 is output.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1796 | Occupant classification ECU malfunction | Occupant classification ECU |
HINT
When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1796 is output, perform troubleshooting for the DTC.
The occupant classification system detects the front passenger seat condition. It then informs a passenger of the front passenger airbag assembly and front seat side airbag assembly RH condition (activated/not activated) with the passenger airbag ON/OFF indicator.
HINT
Approximately 6 seconds after the ignition switch is turned to ON, the passenger airbag ON/OFF indicator will be ON/OFF depending on the conditions listed below.
| Front Passenger Seat Condition | Passenger Airbag ON/OFF Indicator | SRS Warning Light | |
|---|---|---|---|
| ON Indicator | OFF Indicator | ||
| Vacant | OFF | OFF | OFF |
| Adult is seated. | ON | OFF | OFF |
| Child is seated. | OFF | ON | OFF |
| Child restraint system is set. | OFF | ON | OFF |
| Occupant classification system failure | OFF | ON | ON |