Pinpoint Test Bx : Power-Stow Seat Motor 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 BX: Power-Stow Seat Motor 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-stow seat motor to move the seat to and from the STOW position when selected by the seat control switch. When STOW is selected from NORMAL or TAILGATE, the backrest will fold forward to release the spring loaded headrest. If an obstruction is detected in the STOW 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-stow seat motor home position (seat folded and latched to the floor) and then continue with the STOW request. If the PFSM detects an open or short in the power-stow seat motor circuitry, 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-stow seat motor assemblies to detect power-stow seat motor movement and position to the PFSM. If the sensor does not detect motor movement during a request from the seat control switch, the PFSM will disable the power-stow seat motor output. When the seat control switch is pressed again the seat will move in short increments indicating a fault with the sensor or circuitry.

This pinpoint test is intended to diagnose the following:

Wiring, terminals or connectors
Power-stow seat motor and sensor
PFSM