LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2016 >> Flex SEL, FWD >> Repair and Diagnosis >> Body & Frame >> Seats >> Seating System >> Diagnosis And Testing >> Seating >> Principles of Operation >> Third Row Power Seats

Third Row Power Seats

The third row power seat system includes the following components:

The third row power seat relay coil receives voltage from the battery saver relay in the BCM (courtesy lamp circuit) and ground from the chassis. When energized, the relay switch closes and supplies battery voltage from the Battery Junction Box (BJB) to the PFSM. Sufficient battery voltage is required for PFSM operation. If battery voltage drops below 8 volts, a started seat movement stops.

When the gear selector lever is in the PARK position and the liftgate is open, the BCM supplies voltage to the PFSM enable circuit for 30 minutes. With the ignition OFF, the BCM disables the battery saver relay after 10 minutes. The system can be re-enabled by opening any door, pressing the unlock button on the RKE transmitter or turning the ignition ON. A short to voltage on the PFSM enable circuit can result in the third row power seat being operational any time the battery saver relay is energized, regardless of gear selector lever or tailgate position.

The seat control switch contains the seat selector switch button and seat position switch buttons. The PFSM receives a voltage signal from the seat selector switch for 3 modes:

The PFSM receives voltage signals from the seat position switches for 4 possible seat positions:

The power-stow seat motor assemblies rotate the LH or RH seat cushion assemblies together or separately (based on seat[s] selected) and are located at the outboard seat positions. The motor assemblies contain Hall-effect sensors that indicate seat position to the PFSM. The power-stow seat motor assemblies are part of the third row seat pivot tube assembly and are not serviceable separately.

The power-fold motor assemblies rotate the LH or RH seat backrests and are located at the backrest lower outboard positions. The motor assemblies contain Hall-effect sensors that indicate seat backrest position to the PFSM. The LH and RH power-fold motor assemblies are serviceable individually.

The LH and RH latch motors receive voltage from the PFSM. The motors share a common ground supplied by the PFSM. The seat latch motors energize and release the seat latch mechanism(s) when STOW and TAILGATE positions are selected.

The latch switches are normally open and receive approximately 12 volts from the PFSM. The LH and RH latch switches share a common return circuit in series to the PFSM. The PFSM monitors the latch switch circuits to determine if the seat latches are open or closed. The latch switch is mounted to seat latch mechanism and is not serviceable. A new power seat latch must be installed.

When STOW, FOLD or TAILGATE is selected the backrest folds forward enough to release the spring loaded headrest. If the head restraint is not folded prior to achieving FOLD, STOW or TAILGATE positions, the head restraint becomes an obstruction and prevents the seat from completing the seat movement. When an obstruction is detected during any seat movement, the seat stops, reverses movement a few inches and then stops again until the obstruction is removed. When the obstruction has been removed the seat control switch must be pressed again to reset the request. The seat moves to the home position (seat folded and latched to the floor) and then continues to the requested seat position.

On the first press of the seat control switch after the seat is repaired and a new system component has been installed, the PFSM moves the seat to the home position (seat folded and latched to the floor) before continuing to move to the selected seat position. This allows the PFSM to relearn the position of the affected motors.

scientia non olet · About LEMON Manuals