Acura 2007 RL Owner's Manual page 297

Message
U.S.
ACC detects a vehicle ahead of you.
You will hear a beep when the vehicle
CANADA moves out of the ACC radar sensor's
range.
U.S.
ACC does not detect a vehicle ahead
of you.
CANADA You will hear a beep when ACC
detects a vehicle ahead of you.
ACC has automatically cancelled
because its radar sensor in the front
grill is dirty.
You will hear three beeps.
Description
Adaptive Cruise Control (ACC)
Message Description
ACC has automatically cancelled
because of bad weather or other
conditions.
You will hear three beeps.
Apply the brakes immediately.
Your vehicle is too close to the vehicle
ahead of it.
You will hear a continuous beep.
ACC needs to be checked.
Have your vehicle checked by a
dealer.
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