Common Warning and Indicator Lamps
Lamp Description
Color
WAIT
TO START
Wait To Start (EPA07/
EPA10)
EPA10 Detroit engines: Indicates that the system is
preventing the starter from cranking. This can occur when
the ignition switch is turned to START before the gauge
sweep has completed, or if the starter has overheated.
Cummins/Mercedes-Benz engines: Indicates that the intake
warmer is active.
Turn the ignition switch back to ON, wait for the lamp to go
out, then turn the ignition switch to START again.
Amber
START
BLOCKED
Start Blocked (GHG14
Detroit engines only)
Indicates that the system is preventing the starter from
cranking. This can occur when the ignition switch is turned
to START before the gauge sweep has completed, or if the
starter has overheated.
NOTE: Illumination of the Start Blocked lamp does not
indicate a problem with the starter.
Turn the ignition switch back to ON, wait for the lamp to go
out, then turn the ignition switch to START again.
WHEEL
SPIN
Wheel Spin
Flashing indicates the ATC system is active, or the ATC
button has been pressed to allow wheel slip.
Solid illumination indicates a problem with the ATC system.
Repair the ATC system immediately to ensure full braking
capability.
Roll Stability
Momentary illumination indicates that a stability event has
occurred.
On vehicles that are also equipped with ATC, flashing
indicates the ATC button has been pressed to allow wheel
slip.
Hill Start Aid (HSA)
Override
Indicates the HSA switch has been pressed to override the
hill start assist feature.
Engine Brake
†
Indicates the engine brake is enabled.
Green
Left-Turn Signal
Flashing indicates the outside left-turn signal lights are
activated.
Right-Turn Signal
Flashing indicates the outside right-turn signal lights are
activated.
Cruise Control
†
Indicates the cruise control is enabled.
NOTE: The ICU3S does not have a green cruise control
telltale.
Instruments
3.6