DESCRIPTION
The passenger side buckle switch circuit consists of the occupant classification ECU and the front seat inner belt RH.
DTC B1771 is recorded when a malfunction is detected in the passenger side buckle switch circuit.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1771 | One of following conditions is met: Occupant classification ECU receives line short circuit signal, and open circuit signal, short circuit to ground signal or 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 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 284
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 assembly.
DTC B1772 is recorded when a malfunction is detected in the seat position sensor circuit.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1772 | One of following conditions is met: Occupant classification ECU receives line short circuit signal, and open circuit signal, short circuit to ground signal or short circuit to B+ signal in seat position sensor circuit for 2 seconds Seat position sensor malfunction Occupant classification ECU malfunction | Front seat wire RH Seat position 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 B1772 is output, perform troubleshooting for the DTC.
Scheme 285
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.
DTCs B1773 and B1776 are recorded when a malfunction is detected in the seat belt tension sensor circuit.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1773 B1776 | One of following conditions is met: Occupant classification ECU receives line short circuit signal, and open circuit signal, short circuit to ground signal or short circuit to B+ signal in seat belt tension sensor circuit for 2 seconds Seat belt tension sensor malfunction Occupant classification ECU malfunction | Front seat wire RH No. 2 floor wire Front seat outer belt 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 DTCs B1773 and B1776 are output, perform troubleshooting for the DTCs.
Scheme 286
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 recorded when a malfunction is detected in the pressure sensor circuit.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1774 B1775 | One of following conditions is met: Occupant classification ECU receives line short circuit signal, and open circuit signal, short circuit to ground signal or short circuit to B+ signal in pressure sensor circuit for 2 seconds Occupant detection sensor malfunction Occupant classification ECU malfunction | Front seat wire RH Front seat cushion (occupant detection sensor) |
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 DTCs.
Scheme 287
The center airbag sensor communication circuit consists of the occupant classification ECU and the center airbag sensor.
DTC B1790 is recorded when a malfunction is detected in the center airbag sensor communication circuit.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1790 | One of following conditions is met: Occupant classification ECU receives line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in center airbag sensor communication circuit for 2 seconds Center airbag sensor malfunction Occupant classification ECU malfunction | No. 2 floor wire Front seat wire RH Occupant classification ECU Center airbag sensor |
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 288
DTC B1795 is recorded when a malfunction is detected in the occupant classification ECU.
| DTC No. | DTC Detection 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 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 114.8°F) |
| Filtered pressure | 38 to 75 count |
CONDITIONS FOR THE ZERO POINT CALIBRATION
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1797 | One of following conditions is met: Zero point calibration is performed when 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 Front seat cushion (occupant detection sensor) |
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 and front seat side airbag condition (activated/not activated) by 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 | ||
| Adult is seated | ON | OFF | OFF |
| Child is seated | OFF | ON | OFF |
| Vacant | OFF | OFF | OFF |
| Occupant classification system failure | OFF | ON | ON |