Dodge 2009 Ram Diesel Owner's Manual Supplement page 33

"Brake Warning Light" will turn on along with the "ABS
Warning Light." Immediate repair to the ABS system is
required.
Operation of the "Brake Warning Light" can be checked
by turning the ignition switch from the OFF position to
the ON position. The light should illuminate for approxi-
mately two seconds. The light should then turn off unless
the parking brake is applied or a brake fault is detected.
If the light does not illuminate, have the light inspected
by an authorized dealer.
The light also will turn on when the parking brake is
applied with the ignition switch in the ON position.
NOTE: This light shows only that the parking brake is
applied. It does not show the degree of brake application.
UNDERSTANDING YOUR INSTRUMENT PANEL 31
19. Anti-Lock Brake (ABS) Warning Light
This light monitors the Anti-Lock Brake System
(ABS). The light will turn on when the ignition
switch is turned to the ON position and may
stay on for as long as four seconds.
If the "ABS Warning Light" remains on or turns on while
driving, it indicates that the Anti-Lock portion of the
brake system is not functioning and that service is
required. However, the conventional brake system will
continue to operate normally if the "Brake Warning
Light" is not on.
If the "ABS Warning Light" is on, the brake system
should be serviced as soon as possible to restore the
benefits of Anti-Lock brakes. If the "ABS Warning Light"
does not turn on when the ignition switch is turned to the
ON position, have the light inspected by an authorized
dealer.
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