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82 Instruments and Controls
ABS Telltale, Tractor and Trailer
The telltale lights up amber if the Anti-
Lock Brake System (ABS) senses a
problem under the following conditions:
1 The system will go through its self
test when the ignition switch is turned
on and the telltale should continue to
be on. The light should go out when
the vehicle speed reaches over approx-
imately 7 mph (11 km/h). If the
telltale stays on at higher speed, there
is a problem with the ABS.
2 The ABS telltale lights up during driv-
ing. The ABS self test has detected a
fault in the system.
The vehicle can still be driven with a prob-
lem in the ABS. However, the ABS will not
be operating and standard air braking is in
effect. For more information, see page 236.
The trailer ABS telltale is in effect for ve-
hicles manufactured after January 2000.
W3000905
Air Suspension Telltale
The telltale lights up amber when the sus-
pension leveling valve is activated. As long
as the switch is activated, the suspension is
lower than normal and the telltale is on. For
proper use of the suspension level control,
see fifth wheel uncoupling on page 276.
W3002596
Mirror Defroster Telltale (option)
The telltale lights up amber when the mir-
ror defrost switch is engaged. Heater
temperature is automatically regulated by
an internal system in the mirror head.
W3000632