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.
