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Hyundai Equus: Smart cruise control vehicle to vehicle distance
To set vehicle to vehicle distance:

This function allows you to program the vehicle to maintain relative distance to the vehicle ahead without depressing the accelerator pedal or brake pedal.
The vehicle to vehicle distance will automatically activate when the smart cruise control system is on.
Select the appropriate distance according to road conditions and vehicle speed.
Each time the button is pressed, the vehicle to vehicle distance changes as follows:
For example, if you drive at 56 mph (90 km/h), the distance maintains as follows:

Distance 4 - approximately 170 feet
Distance 3 - approximately 131 feet
Distance 2 - approximately 106 feet
Distance 1 - approximately 82 feet
✽ NOTICE
The 'Distance 4' is always set when the system is used for the first time after starting the engine.
When the lane ahead is clear:

CAUTION

CAUTION
If the vehicle ahead (vehicle speed: less than 20 mph (30 km/h)) disappears to the next lane, the warning chime will sound and a message will appear. Adjust your vehicle speed for vehicles or objects that can suddenly appear in front of you by depressing the brake pedal according to the road condition ahead and driving condition.
In traffic situation

In traffic, your vehicle will stop if the vehicle ahead of you stops. Also, if the vehicle ahead of you starts moving, your vehicle will start as well.
However, if the vehicle stops for more than 3 seconds, you must depress the accelerator pedal or push the RES+ switch to start driving.
Smart cruise control speed
Distance to distance vehicle sensorLow tire pressure position telltale
When the tire pressure monitoring system warning indicators are illuminated and
warning massage displayed on the cluster LCD display, one or more of your tires
is significantly under-inflated.
...
Brake fluid
Check brake fluid level in the brake fluid reservoir. The level should be between
“MIN” and “MAX” marks on the side of the reservoir. Use only hydraulic brake fluid
conforming to DOT 3 or ...
Check spark plugs and ignition system
Inspect your spark plugs as described in section 7 and replace them if necessary.
Also check all ignition wiring and components to be sure they are not cracked, worn
or damaged in any way. ...