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.
2022 Subaru Ascent BaseFACTORY OEM SERVICE PROCEDURE
Occupant Detection System DTCS
OCCUPANT DETECTION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| Description & trouble part | Reference |
|---|---|
| OCCUPANT DETECTION SYSTEM MALFUNCTION | Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1650 OCCUPANT DETECTION SYSTEM MALFUNCTION . |
| FRONT BUCKLE SWITCH RH FAILURE | Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1655 FRONT BUCKLE SWITCH RH FAILURE . |
| BUCKLE SWITCH | Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1771 BUCKLE SWITCH . |
| FRONT LEFT OCCUPANT DETECTION SENSOR | Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B177F FRONT LEFT OCCUPANT DETECTION SENSOR . |
| FRONT RIGHT OCCUPANT DETECTION SENSOR | Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1780 FRONT RIGHT OCCUPANT DETECTION SENSOR . |
| REAR LEFT OCCUPANT DETECTION SENSOR | Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1781 REAR LEFT OCCUPANT DETECTION SENSOR . |
| REAR RIGHT OCCUPANT DETECTION SENSOR | Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1782 REAR RIGHT OCCUPANT DETECTION SENSOR . |
| FRONT LEFT OCCUPANT DETECTION SENSOR COLLISION DETECTION | Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1783 FRONT LEFT OCCUPANT DETECTION SENSOR COLLISION DETECTION . |
| FRONT RIGHT OCCUPANT DETECTION SENSOR COLLISION DETECTION | Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1784 FRONT RIGHT OCCUPANT DETECTION SENSOR COLLISION DETECTION . |
| REAR LEFT OCCUPANT DETECTION SENSOR COLLISION DETECTION | Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1785 REAR LEFT OCCUPANT DETECTION SENSOR COLLISION DETECTION . |
| REAR RIGHT OCCUPANT DETECTION SENSOR COLLISION DETECTION | Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1786 REAR RIGHT OCCUPANT DETECTION SENSOR COLLISION DETECTION . |
| VEHICLE SPEED INFORMATION | Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1787 VEHICLE SPEED INFORMATION . |
| OCCUPANT DETECTION SENSOR POWER SUPPLY | Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1788 OCCUPANT DETECTION SENSOR POWER SUPPLY . |
| + B POWER SUPPLY | Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1789 +B POWER SUPPLY . |
| ECU INTERNAL CIRCUIT FAULT | Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B178A ECU INTERNAL CIRCUIT FAULT . |
| SEAT FACTORY CALIBRATION UNCOMPLETED | Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B178B SEAT FACTORY CALIBRATION UNCOMPLETED . |
| VEHICLE FACTORY CALIBRATION UNCOMPLETED | Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B178C VEHICLE FACTORY CALIBRATION UNCOMPLETED . |
| OCCUPANT DETECTION MODULE INTERNAL CIRCUIT | Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1795 OCCUPANT DETECTION MODULE INTERNAL CIRCUIT . |
Factory Service Tools
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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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