Acura ACC with Low Speed Follow indicator

How to read it

Acura’s 2021 RDX manual says ACC with Low Speed Follow helps keep a constant speed and a set following interval behind a vehicle detected ahead and, if that vehicle stops, can slow and stop the car without the driver keeping a foot on the brake or the accelerator. On the RDX and the 2019 TLX, which calls the system ACC with LSF, the green indicator comes on when the MAIN button is pressed. On the 2025 MDX it lights up in white when the driver presses the button, and in green while the system is in operation.

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The amber light

The amber indicator comes on if there is a problem with ACC with Low Speed Follow. The RDX and MDX manuals add that it may come on for a while when the Maximum Load Limit is exceeded, and that ACC is then canceled automatically. On the MDX it also comes on when ACC has been deactivated for a time after the battery was disconnected and reconnected. On the TLX it comes on for a few seconds when the power mode is set to ON, then goes off.

What the manual says to do

For an amber indicator that comes on while driving, the 2019 TLX and 2025 MDX manuals say: “Comes on while driving - Have your vehicle checked by a dealer.” The 2021 RDX manual words it differently: “Stays on constantly - Have your vehicle checked by a dealer.”

Look-alikes

The 2025 MDX has two more lights beside it: a following-interval indicator that comes on with the ACC indicator, and a Cruise Mode indicator, white when the car is switched to ordinary cruise control and green once a cruising speed has been set.

What NHTSA calls it

NHTSA calls this kind of system adaptive cruise control: it automatically adjusts the vehicle’s speed to keep a pre-set distance from the vehicle in front. NHTSA notes that makers use different names for the same driver assistance technologies.