Marker Lamps
To turn the marker lamps on, turn the headlamp switch clockwise past the off position. See Fig..
Marker Interrupt Switch
The marker interrupt switch is located in the right-hand switch pod of the steering wheel for the ICUC system. See Fig.. Pressing it temporarily flashes the marker lamps.
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Phone Hang-Up/Reject
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Marker Interrupt
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Phone Pick-Up
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Headlamp Interrupt
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Cruise Accelerate/Resume
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Quick Access System Settings
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Cancel Cruise Control
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Cruise Decelerate/Set
Fig. 1, Steering Wheel Right-Hand Switch Pod - ICUC
Pretrip Light Test Switch
When the driver presses the pretrip light test switch, shown in Fig., all exterior lights are activated so the driver can exit the vehicle and verify they are working properly. For additional information see Safety Precautions Pre- and Post-Trip Inspections and Maintenance.
Fig. 2, Pretrip Light Test Switch
Spotlamp
The spotlamp switch is located on the pivoting handle of the spotlamp. There may be a single spotlamp assembly mounted above the driver's door, or one above each door.
Utility Lamps
Utility lamps can be swivel-mounted on the upper half of the cab, mounted on the exhaust support, or flush-mounted on the back of the cab or sleeper. Press the upper half of the switch to turn the utility lamps on or off.
When activated, a red indicator light in the switch is illuminated.
Backup Lamps
Backup lamps activate only when the vehicle is in reverse, and are designed to be used while backing up at night.