batteries will not be charging. The Emergency
Power Mode will activate.
Emergency Power Mode
WARNING
If emergency power mode activates, do not shut
down the engine until the vehicle is out of traffic
and in a safe place. The engine will not be able to
be restarted until the cause of the loss of power
is corrected.
The emergency power circuit allows a vehicle to be
moved out of traffic and off the road in the event of a
loss of power.
The emergency power circuit is live even when the
cab load disconnect switch (CLDS) is turned off.
The following is a list of behaviors that could occur
when in emergency power mode:
•
Inoperative switches and lamps.
•
Unresponsive or frozen gauges.
•
Display of warning lamps that indicate low
voltage and/or ECU faults.
•
Lamps either constantly on or flashing.
•
Windshield wipers on low speed.
The cause of the loss of power dictates the specific
behaviors that appear. If emergency power mode is
activated due to a microprocessor failure in the
sSAM ECU, the gauges become unresponsive; this
includes dash panel lamps and turn signal indicators.
NOTE: Possible variations in lamp illumination
are noted in parentheses.
In emergency power mode with the ignition in the ON
position the following lamps stay on constantly:
•
dash panel lamps including turn-signal
indicators (except in case of microprocessor
failure in the sSAM ECU.)
•
headlamp, low beams (left, right, or both sides)
•
headlamp, accent lamps, left and right (in the
case of a BCA fault)
•
rear stop lamp (left, or both sides)
In emergency power mode with the ignition in the ON
position the following lamps flash:
•
headlamp turn signals, both sides
•
trailer tail lamps, both sides
•
outboard clearance lamps, both sides
•
tractor tail lamps (right, left, or both sides)
•
side marker lamps, forward (right, left, or both
sides)
•
identification lamps (all or none)
Turning the ignition switch to OFF when in
emergency power mode shuts down the exterior
lighting, windshield wipers, and the engine. The
engine will not start if the ignition switch is turned
back to the ON position.
Powernet Management
The powernet management feature protects the
batteries from excessive discharge by disconnecting
certain loads—features that draw power—from the
battery power supply. This allows the batteries to
maintain enough of a charge to restart the vehicle.
Features that draw power are prioritized into different
categories:
1.
House loads: This includes the majority of dash
and sleeper power outlets, sleeper reading and
spot lamps, and sleeper auxiliary fans.
2.
Basic loads: This includes power for fleet
management systems and third party telematics
as well as critical dash and sleeper power
outlets.
By making noncritical features that draw power
temporarily unavailable, powernet management
allows the driver to continue using critical features.
f545527a08/14/2020
1
1. LED Indicator Light
Fig. 8.9, Cab Load Disconnect Switch
Electrical System
8.5
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