Instruments and Controls Operating Instructions
– 20 – Y53-6008
Medium Duty (R10/06)
Self Test
When you turn on your ignition, the following warning lights
will turn on for 3 - 5 seconds, as a test to let you know they
are working.
WARNING! Do not ignore a warning light or
buzzer. These signals tell you something is
wrong with your vehicle. It could be a failure in an
important system, such as the brakes, which
could lead to an accident. Have the appropriate
system checked immediately.
The buzzer will sound continuously as long as:
• Engine temperature is above the specified range
• Air pressure to the service brakes is low
• Engine oil pressure is low
• There is a problem in the hydraulic brake system
If the buzzer sounds while driving, or if a light comes on, do
the following:
1. Slow down carefully.
2. Move a safe distance off the road and stop.
3. Set the parking brake. (See Pages 68
and 74 for trans-
mission shifting and parking brake information.)
4. If the engine is overheating do not turn it off, see page
23; otherwise, for other conditions turn the engine OFF.
5. Turn on the emergency flasher and use other warning
devices to alert other motorists.
Diff Lock Trailer ABS
Water Temp Left Turn
Mirror Heat Load Light
Brake Air (or Brake *) High Beam
Fifth Wheel Right Turn
Oil Pressure Engine Fan
ABS Park *
* Vehicle with hydraulic brakes only
