Pinpoint Test BZ : Power-Fold Seat Motor (Backrest) And Sensor Functional Test - RH Third Row Power Seat: Notes

WARNING: This page is about a different car, the 2015 Lincoln MKT. However, it is still accessible from the selected car via links, so may be relevant.

Pinpoint Test BZ: Power-Fold Seat Motor (Backrest) and Sensor Functional Test - RH Third Row Power Seat

Refer to Wiring Diagrams Power Seats for schematic and connector information.

Normal Operation

The Power-Fold Seat Module (PFSM) supplies voltage and ground to the power-fold seat motor to move the seat to and from the FOLD and NORMAL positions when selected by the seat control switch. When FOLD is selected the backrest will fold forward and release the spring loaded headrest. If an obstruction is detected in the FOLD/NORMAL axis of movement the seat will stop, reverse movement a few inches and then stop again until the obstruction is removed. When the obstruction has been removed the seat control switch must be depressed again to reset the request. The seat will go to the power-fold seat motor home position (seat folded and latched to floor) and then continue with any seat position requested. If the PFSM detects a power-fold seat motor circuit fault (open or short), motor operation will be disabled. If a short to ground is present the motor will work in only one direction.

A Hall effect sensor is located inside each of the power-fold seat motor assemblies to detect motor movement and seat position to the PFSM. If the sensor does not detect motor movement during a request from the seat control switch, the PFSM will disable power-fold seat motor output.

This pinpoint test is intended to diagnose the following:

Wiring, terminals or connectors
Power-fold seat motor (backrest) and sensor
PFSM