2019 Subaru Ascent BaseFACTORY OEM SERVICE PROCEDURE

Occupant Detection System DTCS

Code Reference
B1650 Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1650 OCCUPANT DETECTION SYSTEM MALFUNCTION .
B1655 Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1655 FRONT BUCKLE SWITCH RH FAILURE .
B1771 Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1771 BUCKLE SWITCH .
B177F Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B177F FRONT LEFT OCCUPANT DETECTION SENSOR .
B1780 Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1780 FRONT RIGHT OCCUPANT DETECTION SENSOR .
B1781 Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1781 REAR LEFT OCCUPANT DETECTION SENSOR .
B1782 Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1782 REAR RIGHT OCCUPANT DETECTION SENSOR .
B1783 Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1783 FRONT LEFT OCCUPANT DETECTION SENSOR COLLISION DETECTION .
B1784 Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1784 FRONT RIGHT OCCUPANT DETECTION SENSOR COLLISION DETECTION .
B1785 Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1785 REAR LEFT OCCUPANT DETECTION SENSOR COLLISION DETECTION .
B1786 Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1786 REAR RIGHT OCCUPANT DETECTION SENSOR COLLISION DETECTION .
B1787 Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1787 VEHICLE SPEED INFORMATION .
B1788 Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1788 OCCUPANT DETECTION SENSOR POWER SUPPLY .
B1789 Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1789 +B POWER SUPPLY .
B178A Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B178A ECU INTERNAL CIRCUIT FAULT .
B178B Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B178B SEAT FACTORY CALIBRATION UNCOMPLETED .
B178C Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B178C VEHICLE FACTORY CALIBRATION UNCOMPLETED .
B1795 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:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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