F 150 4WD Pickup V8-5.4L SOHC VIN 3 (1999)
Battery Discharge Protection Relay: Description and Operation
The following components are under the control of the battery saver relay:
^
Delayed accessory relay.
^
Overhead interior lamp with map lamps.
^
Underhood lamp switch.
^
Glove box lamp switch.
^
Overhead interior lamp switch.
^
Interior lamp relay coil.
The battery saver relay becomes active (relay coil is energized) when the GEM is in awake mode and is deactivated (relay coil is de-energized) in sleep
mode.
The battery saver will remain active until the ignition state is not ACC or RUN and 45 minutes have passed since last active input. At that time, the relay
will be deactivated and power to the above circuits will terminate.
Five minutes after the battery saver relay has become deactivated, the GEM will go into a lower power state known as sleep mode. In the sleep mode,
the GEM will deactivate all outputs and will monitor select inputs.
Logical characteristics of the GEM battery saver mode are as follows:
Feature Inputs:
^
Sleep/Awake mode status.
Feature Outputs:
^
Battery saver relay control (Open circuit in sleep mode, grounded when awake).
