Acura 2008 RL Owner's Manual page 371

When you turn the ignition switch to
the ON (II) position, the CMBS is
turned on if it was on previously.
Collision Mitigation Brake System (CMBS)
Automatic Shut Off
Any of the conditions below can
cause the CMBS to shut off. When
the system shuts off, the CMBS
indicator in the instrument panel
comes on, and a CHECK CMBS
SYSTEM message appears on the
multi-information display for about 5
seconds.
An abnormal tire condition is
detected (wrong tire size, flat tire,
etc.).
Extended off-road or mountainous
driving.
Driving your vehicle with the
parking brake applied.
Driving your vehicle in bad
weather (rain, fog, snow, etc.).
A dirty emblem on the front grille.
The CMBS will automatically
recover when these conditions are
improved.
365