DESCRIPTION
The passenger side buckle switch circuit consists of the occupant classification ECU and the front seat inner belt assembly RH.
DTC B1771 is recorded when a malfunction is detected in the passenger side buckle switch circuit.
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|---|---|
| B1771 | The occupant classification ECU receives a line short circuit signal, and open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in passenger side buckle switch circuit for 2 seconds Passenger side buckle switch malfunction Occupant classification ECU malfunction | Front seat wire RH Front seat inner belt assembly RH (Passenger side buckle switch) 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 B1771 is output, perform troubleshooting for the DTC.
Scheme 399
The seat belt tension sensor circuit consists of the occupant classification ECU and the seat belt tension sensor.
The seat belt tension sensor sends the seat belt tension signal to the occupant classification ECU.
DTC B1773 and B1776 are recorded when a malfunction is detected in the seat belt tension sensor circuit.
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|---|---|
| B1773 B1776 | The occupant classification ECU receives line short circuit signal, and open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the seat belt tension sensor circuit for 2 seconds. Seat belt tension sensor malfunction Occupant classification ECU malfunction | Front seat wire RH Front seat outer belt assembly RH (Seat belt tension sensor) 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 B1773 and B1776 are output, perform troubleshooting for the DTC.
Scheme 400
The pressure sensor circuit consists of the occupant classification ECU and the occupant classification sensor.
The occupant classification sensor sends the pressure signal to the occupant classification ECU.
DTC B1774 and B1775 are recorded when a malfunction is detected in the pressure sensor circuit.
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|---|---|
| B1774 B1775 | The occupant classification ECU receives a line short circuit signal, and open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the pressure sensor circuit for 2 seconds. Occupant classification sensor malfunction Occupant classification ECU malfunction | Front seat wire RH Occupant classification sensor 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 B1774 and B1775 are output, perform troubleshooting for the DTC.
Scheme 401
The center airbag sensor assembly communication circuit consists of the occupant classification ECU and the 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 for 2 seconds. Center airbag sensor assembly malfunction Occupant classification ECU malfunction | Floor wire No. 2 Front seat wire RH Occupant classification ECU Center airbag sensor assembly |
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 402
DTC B1795 is recorded when a malfunction is detected in the occupant classification ECU.
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|---|---|
| B1795 | 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 B1795 is output, perform troubleshooting for the DTC.
DTC B1797 is output when the following condition is met
- Zero point calibration is performed when the conditions for the calibration are not satisfied.
- Zero point calibration has failed.
| Item | Condition |
|---|---|
| DTC | Not recorded |
| Front passenger seat occupant | Vacant |
| Front passenger side buckle switch | OFF (The seat belt is not fastened) |
| ECU temperature | 0 to 46°C (32 to 114.8°F) |
| Filtered pressure | 38 to 75 count |
CONDITION FOR THE ZERO POINT CALIBRATION
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|---|---|
| B1797 | Zero point calibration is performed when the conditions for the calibration are not satisfied. Zero point calibration has failed. | There is no malfunction if this DTC is not output again after performing occupant classification system zero point calibration. Occupant classification sensor 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 B1797 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 condition (activated/not activated) by 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 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 | ||
| Adult is seated | ON | OFF | OFF |
| Child is seated | OFF | ON | OFF |
| Vacant | OFF | OFF | OFF |
| Occupant classification system failure | OFF | ON | ON |