DESCRIPTION
The passenger side buckle switch circuit consists of the occupant classification ECU and the front seat inner belt RH.
DTC B1771 is stored when a malfunction is detected in the passenger side buckle switch circuit.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1771 | When one of the following conditions is met: The occupant classification ECU receives a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the passenger side buckle switch circuit for 2 seconds. A passenger side buckle switch malfunction. An occupant classification ECU malfunction. | Front seat wire RH Front seat inner belt assembly RH (passenger side buckle switch) No. 1 seat cushion assembly (occupant classification ECU) |
HINT
When DTC B1650 is stored 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 it first.
Scheme 377
The seat position sensor circuit consists of the occupant classification ECU and the seat position sensor.
The seat position sensor sends the seat position signal to the occupant classification ECU to control the dual stage deployment of the front passenger airbag.
DTC B1772 is stored when a malfunction is detected in the seat position sensor circuit.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1772 | When one of the following conditions is met: The occupant classification ECU receives a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the seat position sensor circuit for 2 seconds. A seat position sensor malfunction. An occupant classification ECU malfunction. | Front seat wire RH Seat position sensor No. 1 seat cushion assembly (occupant classification ECU) |
HINT
- When DTC B1650 is output as a result of troubleshooting for the "Airbag System", check the DTCs stored in the occupant classification ECU, and perform troubleshooting for those DTCs first.
- Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTC cannot be read.
Scheme 378
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 stored when a malfunction is detected in the seat belt tension sensor circuit.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1773 B1776 | When one of the following conditions is met: The occupant classification ECU receives a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the seat belt tension sensor circuit for 2 seconds. A seat belt tension sensor malfunction. An occupant classification ECU malfunction. | Front seat wire RH Front seat outer belt assembly RH (seat belt tension sensor) No. 1 seat cushion assembly (occupant classification ECU) |
HINT
When DTC B1650 is stored 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 those DTCs first.
Scheme 379
The pressure sensor circuit consists of the occupant classification ECU and the occupant detection sensor.
The occupant detection sensor sends the pressure signal to the occupant classification ECU.
DTC B1774 and B1775 are stored when a malfunction is detected in the pressure sensor circuit.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1774 B1775 | When one of the following conditions is met: The occupant classification ECU receives a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the occupant detection sensor circuit for 2 seconds. An occupant detection sensor malfunction. An occupant classification ECU malfunction. | Front seat wire RH No. 1 seat cushion assembly (occupant classification ECU and occupant detection sensor) |
HINT
When DTC B1650 is stored 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 those DTCs first.
Scheme 380
The center airbag sensor communication circuit consists of the occupant classification ECU and the center airbag sensor.
DTC B1790 is stored when a malfunction is detected in the center airbag sensor communication circuit.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1790 | When one of the following conditions is met: The occupant classification ECU receives a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the center airbag sensor circuit for 2 seconds. A center airbag sensor malfunction. An occupant classification ECU malfunction. | No. 2 floor wire Front seat wire RH No. 1 seat cushion assembly (occupant classification ECU) Center airbag sensor assembly |
HINT
When DTC B1650 is stored 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 it first.
Scheme 381
DTC B1795 is stored when a malfunction is detected in the occupant classification ECU.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1795 | An occupant classification ECU malfunction. | No. 1 seat cushion assembly (occupant classification ECU) |
HINT
When DTC B1650 is stored 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 it first.
DTC B1797 is output when one of the following conditions 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 115°F) |
| Filtered pressure | 38 to 75 count |
CONDITION FOR THE ZERO POINT CALIBRATION
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1797 | One of the following conditions is met: Zero point calibration is performed when the conditions for 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 No. 1 seat cushion assembly (occupant detection sensor) |
HINT
When DTC B1650 is stored 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 it first.
The occupant classification system detects the front passenger seat condition. It then informs a passenger of the front passenger airbag and front seat airbag 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 |