Emergency Power Mode

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, or the smart battery shut-off switch, 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.

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.