Ignition Sequence
When the ignition is turned on, the ICU runs a self-check. See Fig.. Observing the ignition sequence is a good way to ensure the ICU is functioning properly.
Important: Do not crank the engine until the ICU self-check is complete.
Note: Air gauges do not complete a sweep of their dials during the ignition sequence.
When the ignition is turned on, the following actions should occur:
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electronic gauges complete a full sweep of their dials
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warning and indicator lamps illuminate, then are extinguished
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audible alert sounds for approximately four seconds or until sufficient air pressure builds up in the primary and secondary air systems
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DEF level indicator illuminates all segments green, then turns them off one at a time before turning the leftmost segment amber and then red
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Freightliner logo displays on the ICU4Me driver message center for two seconds.
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software revision level of the ICU is displayed on the driver message center, followed by any active faults
Important: If any red or amber warning and indicator lamps do not illuminate during the ICU self-check or do not go out after the self-check completes, take the action outlined in "Warning and Indicator Lights", or take the vehicle to an authorized Freightliner service facility as soon as possible.
Note: If active faults are present, take the vehicle to an authorized Freightliner service facility as soon as possible.
If the ICU receives active fault codes, it displays them one after the other until the parking brake is released or the ignition is turned off. Once the parking brake is completely released, the ICU displays the odometer. If there are no active faults, the ICU displays the odometer after the self-check completes.
When the self-check is complete on an ICU4M, the fasten seat belt screen displays if the engine is off. If the engine is running, the idle hours screen displays.
