Diagnostic Routine A

Diagnostic Routine A

Diagnostic Overview

Seat Latch Motor and Latch Switch Functional Test - LH

Refer to Wiring Diagram Set 120, Power Seats for schematic and connector information. Diagrams By Number

Normal Operation and Fault Conditions

The PFSM (Power-Fold Seat Module) supplies voltage and ground to the seat latch release motor to electronically release the seat latch from the latched position (seat folded and latched to the floor) when the third row seat control switch sends a signal to the PFSM (Power-Fold Seat Module) to move the seat to the STOW position. The PFSM (Power-Fold Seat Module) monitors the latch switch to determine if the position of the latch is closed or released. If the seat latch does not release, the latch must be mechanically released to move the seat from the latched home position. If a fault is detected during a seat operation, the seat may enter a faulted state. When the seat is in a faulted state, the seat backrest and cushion fold together to prevent the seat from being occupied.

Visual Inspection and Diagnostic Pre-checks

Verify good battery condition before diagnosing the PFSM (Power-Fold Seat Module) system. Poor battery condition may interfere with PFSM (Power-Fold Seat Module) operation. If battery voltage drops below 10 volts, seat movement does not start. If battery voltage drops below 8 volts, a started seat movement stops.

To ensure the most accurate service information, portions of this procedure are under development and may not be immediately available at vehicle introduction.