Jeep GRAND CHEROKEE SRT 2016 Owner's Manual page 138

136 UNDERSTANDING THE FEATURES OF YOUR VEHICLE
Overtaking Traffic
If you pass another vehicle slowly with a relative speed
less than 10 mph (16 km/h) and the vehicle remains in
the blind spot for approximately 1.5 seconds, the warning
light will be illuminated. If the difference in speed
between the two vehicles is greater than 10 mph
(16 km/h), the warning light will not illuminate.
Overtaking/Approaching