Excursion 2WD V8-5.4L SOHC VIN L (2000)
Multifunction Electronic Control Modules: Description and Operation
MODULE CONTROLLED FUNCTIONS
CAUTION: Electronic modules are sensitive to electrical charges. If exposed to these charges, damage may result.
NOTE: Upon installation of a new GEM, the module must be reconfigured. For additional information refer to Module Communications network
(Information Bus).
The Generic Electronic Module (GEM) is the only multi-function module on this vehicle.
The GEM constantly monitors its subsystems for concerns. If a concern is found in one of the subsystems, the GEM will record the concern in the form
of a Diagnostic Trouble Code (DTC).
The ignition switch position is very important to the GEM function. Often times, erratic or unexpected GEM function can be traced to problems with
these GEM inputs.
The GEM controls a variety of Systems:
^
4-wheel drive functions
^
front and rear interval wiper/washer
^
warning chimes
^
keyless entry
^
interior and exterior lamps
^
power windows
The GEM receives inputs from the following:
^
ajar switch
^
headlamp switch
^
keyless entry keypad
^
antilock brake system module wheel speed sensor signal
^
ignition switch
^
remote keyless entry transmitter
The GEM uses these inputs to control the output to the battery saver relay and interior lamp relay. Both relays are accessible from the central junction
box.
