DESCRIPTION
The passenger side buckle switch circuit consists of the occupant classification ECU and front seat inner belt assembly RH.
DTC B1771 is stored 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. 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 |
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 26
The passenger side buckle switch circuit consists of the occupant classification ECU and front seat inner belt assembly RH.
DTC B1771 is stored 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. 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 |
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.
The front occupant classification sensor LH circuit consists of the occupant classification ECU and front occupant classification sensor LH.
DTC B1780 is stored 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. 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 27
The front occupant classification sensor LH circuit consists of the occupant classification ECU and front occupant classification sensor LH.
DTC B1780 is stored 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. 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.
The front occupant classification sensor RH circuit consists of the occupant classification ECU and front occupant classification sensor RH.
DTC B1781 is stored 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. 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 28
The front occupant classification sensor RH circuit consists of the occupant classification ECU and front occupant classification sensor RH.
DTC B1781 is stored 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. 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.
The rear occupant classification sensor LH circuit consists of the occupant classification ECU and rear occupant classification sensor LH.
DTC B1782 is stored 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. 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 29
The rear occupant classification sensor LH circuit consists of the occupant classification ECU and rear occupant classification sensor LH.
DTC B1782 is stored 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. 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.
The rear occupant classification sensor RH circuit consists of the occupant classification ECU and rear occupant classification sensor RH.
DTC B1783 is stored 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. 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 30
The rear occupant classification sensor RH circuit consists of the occupant classification ECU and rear occupant classification sensor RH.
DTC B1783 is stored 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. 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.
DTC B1785 is stored 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 stored when the front seat assembly RH is subjected to a strong impact, even if an actual accident does not occur.
If the vehicle is not in a collision, but the occupant classification ECU outputs a collision detection signal and sets DTC B1785, the DTC can be cleared by performing the 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.
Scheme 31
DTC B1785 is stored 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 stored when the front seat assembly RH is subjected to a strong impact, even if an actual accident does not occur.
If the vehicle is not in a collision, but the occupant classification ECU outputs a collision detection signal and sets DTC B1785, the DTC can be cleared by performing the 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 stored 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 stored when the front seat assembly RH is subjected to a strong impact, even if an actual accident does not occur.
If the vehicle is not in a collision, but the occupant classification ECU outputs a collision detection signal and sets DTC B1786, the DTC can be cleared by performing the 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.
Scheme 32
DTC B1786 is stored 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 stored when the front seat assembly RH is subjected to a strong impact, even if an actual accident does not occur.
If the vehicle is not in a collision, but the occupant classification ECU outputs a collision detection signal and sets DTC B1786, the DTC can be cleared by performing the 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 stored 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 stored when the front seat assembly RH is subjected to a strong impact, even if an actual accident does not occur.
If the vehicle is not in a collision, but the occupant classification ECU outputs a collision detection signal and sets DTC B1787, the DTC can be cleared by performing the 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.
Scheme 33
DTC B1787 is stored 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 stored when the front seat assembly RH is subjected to a strong impact, even if an actual accident does not occur.
If the vehicle is not in a collision, but the occupant classification ECU outputs a collision detection signal and sets DTC B1787, the DTC can be cleared by performing the 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 stored 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 stored when the front seat assembly RH is subjected to a strong impact, even if an actual accident does not occur.
If the vehicle is not in a collision, but the occupant classification ECU outputs a collision detection signal and sets DTC B1788, the DTC can be cleared by performing the 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.
Scheme 34
DTC B1788 is stored 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 stored when the front seat assembly RH is subjected to a strong impact, even if an actual accident does not occur.
If the vehicle is not in a collision, but the occupant classification ECU outputs a collision detection signal and sets DTC B1788, the DTC can be cleared by performing the 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 stored when a malfunction is detected in the center airbag sensor assembly communication circuit.
| DTC No. | DTC Detection 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. Center airbag sensor assembly malfunction Occupant classification ECU malfunction | Occupant classification ECU Center airbag sensor assembly Floor wire 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 B1790 is output, perform troubleshooting for the DTC.
Scheme 35
The center airbag sensor assembly communication circuit consists of the occupant classification ECU and center airbag sensor assembly.
DTC B1790 is stored when a malfunction is detected in the center airbag sensor assembly communication circuit.
| DTC No. | DTC Detection 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. Center airbag sensor assembly malfunction Occupant classification ECU malfunction | Occupant classification ECU Center airbag sensor assembly Floor wire 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 B1790 is output, perform troubleshooting for the DTC.
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 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. 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 36
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 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. 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.
DTC B1794 is set when a malfunction is detected in the occupant classification ECU.
| DTC No. | DTC Detections Conditions | Trouble Areas |
|---|---|---|
| B1794 | Occupant classification ECU circuit malfunction Occupant classification ECU malfunction The occupant classification ECU receives a short circuit to ground signal in the passenger side buckle switch circuit for 2 seconds | Battery Wire harness Occupant classification ECU |
HINT
- When DTC B1650/32 is detected as a result of troubleshooting the supplemental restraint system, perform troubleshooting for DTC B1794 of the occupant classification system.
- Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTCs cannot be read.
Scheme 37
DTC B1794 is set when a malfunction is detected in the occupant classification ECU.
| DTC No. | DTC Detections Conditions | Trouble Areas |
|---|---|---|
| B1794 | Occupant classification ECU circuit malfunction Occupant classification ECU malfunction The occupant classification ECU receives a short circuit to ground signal in the passenger side buckle switch circuit for 2 seconds | Battery Wire harness Occupant classification ECU |
HINT
- When DTC B1650/32 is detected as a result of troubleshooting the supplemental restraint system, perform troubleshooting for DTC B1794 of the occupant classification system.
- Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTCs cannot be read.
DTC B1795 is stored 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.
DTC B1795 is stored 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 engine switch is off.
In this mode, if occupant classification ECU detects an internal malfunction, DTC B1796 is stored.
| 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.
In sleep mode, the occupant classification ECU reads the condition of each sensor while the engine switch is off.
In this mode, if occupant classification ECU detects an internal malfunction, DTC B1796 is stored.
| 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 passenger side knee airbag condition (activated/not activated) with the passenger airbag ON/OFF indicator.
HINT
Approximately 6 seconds after the engine switch is turned on (IG), the passenger airbag ON/OFF indicator will indicate 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 |
The occupant classification system detects the front passenger seat condition. It then informs a passenger of the front passenger airbag assembly and front passenger side knee airbag condition (activated/not activated) with the passenger airbag ON/OFF indicator.
HINT
Approximately 6 seconds after the engine switch is turned on (IG), the passenger airbag ON/OFF indicator will indicate 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 |
See also:
• REMOVAL