If the Transmitter/Fob remains stationary and is not moved for one hour, it will go to sleep and may
create a fob not in range condition.
This system is designed to prevent batteries from going dead in the event the ignition is left on while
unattended, it is also designed to shut the vehicle off if left running unattended. After a Power Mode timeout,
the Power Mode Master is responsible for shutting down the or transitioning the vehicle into the low parasitic
sleep state “OFF” Power Mode. This Power Mode timeout strategy uses Vehicle Speed, Vehicle Power Mode,
Parked Status and other Vehicle Conditions to make the timeout determination.
Accessory Power Mode
The Accessory Power Mode will timeout after approximately 5 minutes. The timer will Start once the system
has determined it is in the Accessory Power Mode status. After the timer expires the Power Mode will change
to the OFF Power Mode.
Run Power Mode
if the conditions listed below are met the Run Power Mode will timeout after approximately 40 minutes if the
transmitter is in range, or 20 minutes if the transmitter is out of range. The timer will Start once the system
has determined it is in the Run Power Mode status and all of the following conditions are met. After the timer
expires the Power mode will change to OFF Power Mode.
If any of the following conditions are not met and/or if there is a change in the Brake Pedal or Clutch Pedal
status, the Run Mode timeout timer will be disabled, and the timer will restart after all of the conditions are
met again.
Vehicle in Run Mode (Vehicle powered up S38 On/Off Vehicle Switch Green indicator on Propulsion
Mode Inactive)
Propulsion is Inactive
Vehicle in Park.
Vehicle Speed is 0 KM/MPH.
Fast Idle is inactive (If Equipped).
PTO Remote Start Status is inactive (If Equipped).
Particulate Filter Cleaning Status is Inactive (if Equipped)
S38 Vehicle On/Off switch was held for more than 5 to 10 seconds while starting the vehicle the actual
time may vary based on model and/or year.
Propulsion Power Mode
If the following conditions listed below are met the Propulsion Power Mode will timeout after approximately
30 minutes if the transmitter is in range, or 15 minutes if the transmitter is out of range. The timer will Start
once the system has determined it is in the Propulsion Power Mode status and all of the following conditions
are met. After he timer expires the Power mode will change to the OFF Power Mode.
The Propulsion Power Mode timeout can be disabled with then vehicle in Off Power Mode, apply and continue
to hold the brake pedal, then press and hold the S38 Vehicle On/Off switch for 5 to 10 seconds (the actual
time may vary based on model and/or year). A DIC message will be displayed when Power Mode timeout is
disabled.
If any of the following conditions are not met and/or if there is a change in the Brake Pedal or Clutch Pedal
status, the Propulsion Mode timeout timer will be disabled, and the timer will restart after all of the
conditions are met again.
Vehicle in Propulsion Mode (Propulsion Active).
Vehicle in Park.
Vehicle Speed is 0 KM/MPH.
Fast Idle is Inactive (If Equipped).
PTO Remote Start Status is inactive (If Equipped).
Particulate Filter Cleaning Status is Inactive (if Equipped)
S38 Vehicle On/Off switch was held for more than 5 to 10 seconds while starting the vehicle the actual
time may vary based on model and/or year.
Relay Controlled Power Mode
The BCM uses discrete push button switch inputs, transmitter in range status, current power mode state, and
brake pedal position state to distinguish the correct power mode (Off, Accessory Mode, Run Mode,
Start/Propulsion Mode). The BCM, after determining the desired power mode, will activate the appropriate
relays for that power mode.
The retained accessory power relay remains on for a timed period after the Ignition Mode is OFF. Refer to
Retained Accessory Power Description and Operation for more information on the retained accessory power
function.
Push Button Start
The ignition mode switch has 2 LEDs that indicate the vehicle power mode Amber for Accessory Mode and
Green for Run or Start/Propulsion Modes. When the vehicle is in the OFF mode, both LED’s will be OFF.
Momentarily pressing the S38 On/Off Vehicle Switch button once, brake pedal not applied, the vehicle will
enter into the Accessory Mode and the Amber LED will illuminate. The Accessory Mode will timeout after
approximately 5 min to help reduce battery drain. With the ignition OFF, brake pedal not pressed, then
pressing and holding the S38 On/Off Vehicle Switch for 5 s will place the vehicle in Run Mode (Ignition ON
without the Propulsion Mode Active). The vehicle will stay powered up for approximately 40 minutes if the
transmitter is in range, or 20 minutes if the transmitter is out of range, and the Green LED will illuminate.
With the ignition OFF brake pedal pressed, then press and release the iS38 On/Off Vehicle Switch, the vehicle
will enter Start/Propulsion Mode and the Green LED will illuminate, the engine will crank and the engine will
be running for Internal combustion engines (ICE), or Propulsion mode will go Active on Electric Vehicles (EV).
The Propulsion Mode will timeout after approximately 30 minutes if the transmitter is in range, or 15 minutes
if the transmitter is out of range. The timer will stop when the vehicle is shifted out of PARK or the brake
pedal is pressed and released, the timer will reset after the vehicle is placed back in PARK with the
Propulsion Mode Active.
Both LED’s have the voltage supplied from the body control module (BCM). The ignition mode switch sends
the ignition mode switch status to the passive entry passive start module (PEPS) and to the BCM. The PEPS
module sends a redundant signal to the BCM with the ignition mode switch status.
Transport Mode
Transport Mode is designed to reduce the parasitic load of some modules during shipping and/or during
vehicle storage. Some features may be disabled or have reduced functionality while Transport Mode is ON.
Transport Mode is enabled and disabled by either of the following methods:
With the Scan Tool Diagnostics > Body Control Module > Control Functions > Power Mode.
Turning the hazard flashers ON, apply and hold the brake pedal, then press and hold the ignition mode
switch for greater than 15 s. For vehicles equipped with a DIC a message Transport Mode On when it is
enabled and Transport Mode Off when it is disabled will be displayed for a predetermined amount of
time. For vehicles equipped without a DIC, the battery indicator light will constantly flash on the
Instrument Cluster when Transport Mode is enabled.
Battery Saver Mode
There are 7 different Battery Saver Modes. Battery Saver Modes 1 to 3 occur in Accessory and Run Power
Modes (vehicle on propulsion system Inactive) if the battery voltage drops below approximately 11.5 V.
Battery Saver Modes 4 to 7 occur in the Off Power Mode only. Battery Saver Modes 4 to 7 may set DTC’s.
Battery Saver Mode 1: DIC message “Battery Low, Start Vehicle”, 4 chimes
Battery Saver Mode 2: DIC message “Battery Low, Start Vehicle”, Load Shed Level 3 is activated
Battery Saver Mode 3: DIC message “Battery Low, Start Vehicle”, Radio/Infotainment shut off, Load
Shed Level 3 active
Battery Saver Mode 4: Battery Saver Mode Ignition Off – Parasitic Current draw of 100 mA or greater
Battery Saver Mode 5: Battery Saver Mode Ignition Off – Parasitic Current draw of 1 A or greater
Battery Saver Mode 6: Battery Saver Mode Ignition Off – Battery Voltage less than 12.0 V
Battery Saver Mode 7: Battery Saver Mode Ignition Off – Battery Voltage less than 11.6 V
Load Shedding
Prior to Load shedding Idle Boost will occur, the idle speeds will be increased by 25 to 300 RPM to help
maintain a normal battery voltage. Idle Boost may be noticeable to the driver. If the battery voltage
continues to drop below a normal state then load shedding will go active and it will start to reduce electric
loads for components that will not impact the safe operation of vehicle. At load shed levels 2 and 3 a DIC
message will be displayed “Reducing Features To Save Battery”. When load shedding is active the customer
may begin to notice features starting to have reduced functions or may become inoperative. Examples of
affected loads are radio, HVAC blower(s) front and rear (if equipped), heated/ventilated seats, heated
mirrors, rear defogger and other devices with heavy electrical draws. Idle Boost and load shed levels can be
observed with the scan tool.
Idle Boost 1
Idle is increased by 25-100 RPM and generally is not noticeable to most drivers.
Idle Boost 2
Idle is increased by 50–200 RPM and generally is not noticeable to most drivers.
Idle Boost 3
Idle is increased by 100–300 RPM and may be noticeable to most drivers.
Load Shed Level 1
Reduces load current by 25%.
Load Shed Level 2
Reduces load current by 50%.
Load Shed Level 3
Electric loads for components that will not impact the safe operation of vehicle will be turned Off.
BCM Awake/Sleep States
The BCM is able to control or perform all of the BCM functions in the awake state. The BCM enters the sleep
state when active control or normal monitoring of system functions has stopped and a time limit has passed.
The BCM must detect certain wake-up inputs before entering the awake state. The BCM monitors for these
inputs during the sleep state.
The BCM will enter the awake state if any of the following wake-up inputs are detected:
Activity on the serial data line
Detection of a battery reconnect
Any door open signal
Headlamps ON
Ignition ON
Park lamps ON
Keyless entry or remote start message
The BCM will enter a sleep state when all of the following conditions exist:
Ignition OFF, transmitter is out of range
No activity exists on the serial data line.
No outputs are commanded.
No delay timers are actively counting.
No wake-up inputs are present.
If all these conditions are met, the BCM will enter a low power or sleep condition.