DESCRIPTION
The front occupant classification sensor LH circuit consists of the occupant detection ECU and front occupant classification sensor LH (separate type front seat cushion spring assembly RH).
DTC B1780 is stored when a malfunction is detected in the front occupant classification sensor LH circuit.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B1780 | Front Occupant Classification Sensor LH Circuit Malfunction | The occupant detection ECU detects a line short, short to ground or B+, or an open in the front occupant classification sensor LH circuit. Front occupant classification sensor LH malfunction Occupant detection ECU malfunction | Front seat wire RH Front occupant classification sensor LH (Separate type front seat cushion spring assembly RH) Occupant detection ECU |
Scheme 36
The rear occupant classification sensor LH circuit consists of the occupant detection ECU and rear occupant classification sensor LH (separate type front seat cushion spring assembly RH).
DTC B1782 is stored when a malfunction is detected in the rear occupant classification sensor LH circuit.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B1782 | Rear Occupant Classification Sensor LH Circuit Malfunction | The occupant detection ECU detects a line short, short to ground or B+, or an open in the rear occupant classification sensor LH circuit. Rear occupant classification sensor LH malfunction Occupant detection ECU malfunction | Front seat wire RH Rear occupant classification sensor LH (Separate type front seat cushion spring assembly RH) Occupant detection ECU |
Scheme 37
DTC B1785 is stored when the occupant detection 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 did not occur.
If the vehicle was not in a collision, but the occupant detection ECU receives a collision detection signal and stores DTC B1785, the DTC can be cleared by performing Zero Point Calibration and Sensitivity Check.
Therefore, if DTC B1785 is output, first perform Zero Point Calibration and Sensitivity Check.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B1785 | Front Occupant Classification Sensor LH Collision Detection | Front occupant classification sensor LH sensed large load. Separate type front seat cushion spring assembly RH malfunction | Front occupant classification sensor LH (Separate type front seat cushion spring assembly RH) |
In sleep mode, the occupant detection ECU reads the condition of each sensor while the engine switch is off.
In this mode, if the occupant detection ECU detects an internal malfunction, DTC B1796 is stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B1796 | Sleep Operation Failure of Occupant Classification ECU | Occupant detection ECU malfunction | Occupant detection ECU |
DTC B1795 is stored when a malfunction is detected in the occupant detection ECU.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B1795 | Occupant Classification ECU Malfunction | Occupant detection ECU malfunction | Occupant detection ECU |
DTC B1794 is stored when a malfunction is detected in the occupant detection ECU battery positive line.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B1794 | Open in Occupant Classification ECU Battery Positive Line | The occupant detection ECU receives an open circuit signal in the occupant detection ECU battery positive line. Occupant detection ECU malfunction | Battery Wire harness Occupant detection ECU |
Scheme 38
DTC B1787 is stored when the occupant detection 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 did not occur.
If the vehicle was not in a collision, but the occupant detection ECU receives a collision detection signal and stores DTC B1787, the DTC can be cleared by performing Zero Point Calibration and Sensitivity Check.
Therefore, if DTC B1787 is output, first perform Zero Point Calibration and Sensitivity Check.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B1787 | Rear Occupant Classification Sensor LH Collision Detection | Rear occupant classification sensor LH sensed large load. Separate type front seat cushion spring assembly RH malfunction | Rear occupant classification sensor LH (Separate type front seat cushion spring assembly RH) |
The airbag sensor assembly communication circuit consists of the occupant detection ECU and airbag sensor assembly.
DTC B1790 is stored when a malfunction is detected in the airbag sensor assembly communication circuit.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B1790 | Center Airbag Sensor Assembly Communication Circuit Malfunction | The occupant detection ECU detects a line short, short to ground or B+, or an open in the center airbag sensor assembly communication circuit. Occupant detection ECU malfunction Airbag sensor assembly malfunction | Floor wire Front seat wire RH Occupant detection ECU Airbag sensor assembly |
Scheme 39
The occupant classification sensor power supply circuit consists of the occupant detection ECU, front occupant classification sensor LH* and rear occupant classification sensor LH*.
DTC B1793 is stored when a malfunction is detected in the occupant classification sensor power supply circuit.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B1793 | Occupant Classification Sensor Power Supply Circuit Malfunction | The occupant detection ECU detects a line short, short to ground or B+ in the occupant classification sensor power supply circuit. Front occupant classification sensor LH malfunction Rear occupant classification sensor LH malfunction Occupant detection ECU malfunction | Front seat wire RH Front occupant classification sensor LH* Rear occupant classification sensor LH* Occupant detection ECU |
HINT
*: The front occupant classification sensor LH and rear occupant classification sensor LH are built into the separate type front seat cushion spring assembly RH.
Scheme 40
The passenger side buckle switch circuit consists of the occupant detection ECU and passenger side buckle switch (front seat inner belt assembly RH).
DTC B1771 is stored when a malfunction is detected in the passenger side buckle switch circuit.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B1771 | Passenger Side Buckle Switch Circuit Malfunction | The occupant detection ECU detects a line short, short to ground or B+, or an open in the passenger side buckle switch circuit. Passenger side buckle switch malfunction Occupant detection ECU malfunction | Front seat wire RH Passenger side buckle switch (Front seat inner belt assembly RH) Occupant detection ECU |
Scheme 41
The occupant classification system detects the front passenger seat condition. It then displays the instrument panel passenger airbag assembly and lower No. 2 instrument panel airbag assembly condition (activated/not activated) using 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 | ON | OFF |
| Adult is seated | ON | OFF | OFF |
| Child is seated | OFF | ON | OFF |
| Child restraint system is installed | |||
| Occupant classification system failure | OFF | ON | ON |