Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Trouble Code Chart
HINT:
When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, perform troubleshooting for the occupant classification system as shown in the chart below.
| DTC Code | Detection Item | Trouble Area | Passenger Airbag ON/OFF Indicator (OFF Indicator) | See |
|---|---|---|---|---|
| B1771 | Passenger Side Buckle Switch Circuit Malfunction | 1. Front seat wire RH 2. Front seat inner belt assembly RH (Passenger side buckle switch) 3. Occupant classification ECU |
ON | Refer to DTC B1771: Passenger Side Buckle Switch Circuit Malfunction |
| B1772 | Seat Position Sensor Circuit Malfunction | 1. Front seat wire RH 2. Seat position airbag sensor (Passenger side) 3. Occupant classification ECU |
ON | Refer to DTC B1772: Seat Position Sensor Circuit Malfunction |
| B1773 | Belt Tension Sensor Circuit Malfunction | 1. No. 2 floor wire 2. Front seat wire RH 3. Front seat outer belt assembly RH (Seat belt tension sensor) 4. Occupant classification ECU |
ON | Refer to DTC B1773: Belt Tension Sensor Circuit Malfunction; DTC B1776: Seat Belt Tension Sensor Power Source Circuit Malfunction |
| B1774 | Pressure Sensor Circuit Malfunction | 1. Front seat wire RH 2. Occupant classification sensor 3. Occupant classification ECU |
ON | Refer to DTC B1774: Pressure Sensor Circuit Malfunction; DTC B1775: Pressure Sensor Power Source Circuit Malfunction |
| B1775 | Pressure Sensor Power Source Circuit Malfunction | 1. Front seat wire RH 2. Occupant classification sensor 3. Occupant classification ECU |
ON | Refer to DTC B1774: Pressure Sensor Circuit Malfunction; DTC B1775: Pressure Sensor Power Source Circuit Malfunction |
| B1776 | Seat Belt Tension Sensor Power Source Circuit Malfunction | 1. No. 2 floor wire 2. Front seat wire RH 3. Front seat outer belt assembly RH (Seat belt tension sensor) 4. Occupant classification ECU |
ON | Refer to DTC B1773: Belt Tension Sensor Circuit Malfunction; DTC B1776: Seat Belt Tension Sensor Power Source Circuit Malfunction |
| B1790 | Center Airbag Sensor Assembly Communication Circuit Malfunction | 1. No. 2 floor wire 2. Front seat wire RH 3. Occupant classification ECU 4. Center airbag sensor assembly |
ON | Refer to DTC B1790: Center Airbag Sensor Assembly Communication Circuit Malfunction |
| B1795 | Occupant Classification ECU Malfunction | Occupant classification ECU | ON | Refer to DTC B1795: Occupant Classification ECU Malfunction |
| B1797 | Calibration Malfunction | 1. There is no malfunction if this DTC is not output again after performing occupant classification system zero point calibration. 2. Occupant classification sensor 3. Occupant classification ECU |
ON | Refer to DTC B1797: Calibration Malfunction |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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