Reseating Subaru loose connector

June 4, 2024
This bulletin applies to 2019 Subaru Forester vehicles. A small number of field reports have been received with a concern involving DMS (drive monitoring system) being inoperative.

This bulletin applies to 2019 Subaru Forester vehicles. A small number of field reports have been received with a concern involving DMS (drive monitoring system) being inoperative.

One of these reports stated a DTC U0156 for lost communication was stored in multiple modules. In addition, the seat memory feature was also found to be inoperative.

After performing extensive electrical diagnosis, the root cause was traced to a loose harness connector located behind the exterior trim cover of the driver’s door mirror assembly. The upper and lower covers were carefully removed using a plastic trim tool. With covers removed, access to this connector was made easier by removing the turn signal lamp from the mirror housing.

After re-seating the connector and confirming that it was fully locked in place, all systems returned to normal operation. When removing the covers, remove the lower cover first, then the top. On re-installation, fit the top cover first.

About the Author

Motor Age Staff

Motor Age has been publishing technical content for professional automotive technicians since 1899. Our writers have decades of experience and scores of ASE certifications, and they continue to teach new generations of technicians via classrooms all around the globe, as well as through the books and training manuals they've authored. 

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