Automatic Emergency Braking (AEB) Limited Service Required warning in Jeep Grand Cherokee

Forward Collision Warning (FCW) with Mitigation is a driver assistance technology in Jeep Grand Cherokee that warns the driver of an impending collision with a vehicle or object in front of the vehicle. In this article we discuss why the Automatic Emergency Braking (AEB) Limited Service Required alert message appears in the instrument cluster and how you can diagnose the problem.

Forward Collision Warning (FCW) with Mitigation

The FCW system uses sensors to detect the forward environment and alert the driver if a collision is imminent. The system also has mitigation capabilities, which can automatically apply the brakes to reduce the severity of a collision or prevent it entirely. This technology helps increase the overall safety of the vehicle and provides an added layer of protection for the driver and passengers.

FCW system uses information from forward-facing sensors and the Electronic Brake Controller (EBC) to calculate the chance of a collision happening. If the system determines that a collision is likely, the driver will get both auditory and visual warnings, and may also get a braking warning. If the driver does not respond to the warnings, the system will activate limited braking to help slow down the vehicle and prevent the collision. If the driver does start braking but doesn’t apply enough force, the system will help by providing additional brake force.

FCW Limited Warning

If the Jeep’s dashboard displays a message saying “Automatic Emergency Braking (AEB) Limited Service Required” or “Limited Functionality Clean Front Windshield,” it means that there’s an issue affecting the FCW system. While the vehicle can still be driven normally, the active braking feature may not work properly. Once the problem is resolved, the system will return to normal. However, if the problem continues, it’s recommended to take the vehicle to an authorized dealer for repair.

Clean the FCW sensor

Keeping the windshield clean is an important step in maintaining the proper functioning of the FCW system. The forward-facing sensors are located behind the back-view mirror and are responsible for gathering information about the road ahead, and if they become dirty or obstructed, the performance of FCW system can be impacted.

Forward Collision Warning (FCW) sensor location in Jeep Grand Cherokee.

Common problem in very cold weather conditions

This is a common problem in snowy conditions as snow and ice can accumulate on the windshield and obstruct the view of the forward-facing sensors. This can limit the functionality of the FCW system and cause the instrument cluster to display the “Limited Functionality Clean Front Windshield” or “Automatic Emergency Braking (AEB) Limited Service Required” message. It is important to regularly clean the windshield during snowy conditions to ensure that the FCW system is functioning properly and to help reduce the risk of a potential collision.

AEB Unavailable Service Required Warning

If the Automatic Emergency Braking (AEB) system turns off, the instrument cluster will display a message saying “AEB Unavailable Service Required.” This means there is an internal system fault and the AEB function may not be available. While the vehicle can still be driven normally, it is important to have the system checked by an authorized Jeep dealer as soon as possible, as this increases the risk of a potential collision.

Note: The minimum speed for FCW activation is 3 mph (5 km/h).

Adjusting Forward Collision Warning Settings

You can adjust the Forward Collision Warning sensitivity and other settings from the center infotainment system screen. Go to Vehicle > Settings > Safety & Driving Assistance > Automatic Emergency Braking.

Watch this video to see FCW settings in the center screen of Jeep Grand Cherokee. (Video starts from the FCW settings.)
Author: Nabeel K

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6 months ago

I was driving through a snowstorm and saw this message. Hope it doesn’t appear again.