Daimler Freightliner Cascadia 2021, Driver Manual

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In limp home mode with the ignition in the ON posi-
tion the following lamps will stay constantly on:
•
dash panel lamps including turn-signal indica-
tors (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 limp home mode with the ignition in the ON posi-
tion the following lamps will 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 limp
home mode shuts down the exterior lighting, wind-
shield 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 bat-
teries 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 man-
agement systems and third party telematics as
well as critical dash and sleeper power outlets.
By making noncritical features that draw power tem-
porarily unavailable, powernet management allows
the driver to continue using critical features.
Progressive low voltage disconnect (PLVD) is used
to implement the powernet management feature.
PLVD calculates disconnecting loads based on bat-
tery voltage, ignition switch status, and engine rpm.
When battery voltage drops below a predetermined
value, house loads are turned off. One minute before
house loads are turned off, a pop-up message will
display in the ICU and an audible alarm will sound.
The front reading lamp, spot lamp, and sleeper
lamps—designated as house loads—can be turned
back on after being shutdown by PLVD by pressing
on the light or light switch.
No alarm sounds before basic loads are turned off.
A time delay is implemented for the shutdown and
reactivation of loads to avoid unnecessary cycling
when battery voltage is close to shutdown thresh-
olds.
Loads disconnected by the PLVD will reconnect
when all of the following conditions are met:
•
ignition ON;
•
engine at 450 rpm or above;
•
batteries reach and maintain 12.7 volts for one
minute.
Optional Power Systems
A 48" sleeper may be equipped with shore power; a
60" and 72" sleeper may be equipped with shore
power and/or an optional inverter/charger.
Shore Power
Shore power provides the ability to connect to an
external power source when parked by providing ex-
terior power inlets. The 120 volts of alternating cur-
rent provided can be used to power small appliances
and electrical equipment without idling the engine.
A shore power system consists of one or two 120
volt power inlets on the exterior of the cab and, de-
pending on the cab height, one to two power recep-
tacles inside the cab. Sixty-inch and seventy-two inch
raised roof sleeper cabs have two power receptacles;
the forty-eight raised roof sleeper cab has one power
receptacle.
An optional 120 volt indicator illuminates on the ICU
when the shore power system is in use.
Electrical System
11.7