S-Type (X200) V8-4.0L (AJ28) (2001)
Inertia Fuel Shutoff Switch: Description and Operation
Inertia switch
The inertia switch is located behind the trim on the left side of the vehicle,
forward of the front door post and below the fascia. A finger access hole in the
trim allows the switch to be reset.
If the inertia switch is tripped, it interrupts the ignition switched B+ voltage
supply circuit to the fuel pump relay coil. The direct B+ voltage fuel pump
supply to the RECM is interrupted and the pump immediately stops.