Kia K4: Forward Collision-Avoidance Assist (FCA) (Sensor Fusion) / Forward Collision-Avoidance Assist malfunction and limitations

Kia K4 (CL4) 2025-2026 Owner's Manual / Driver assistance guide / Forward Collision-Avoidance Assist (FCA) (Sensor Fusion) / Forward Collision-Avoidance Assist malfunction and limitations

Contents:

Forward Collision-Avoidance Assist malfunction

Kia K4 instrument cluster displaying a system check notification for the driver assistance system

Check Driver Assistance system

If the Forward Collision-Avoidance Assist (FCA) system in your Kia K4 encounters a fault and is not functioning correctly, the instrument cluster will provide visual alerts to notify the driver. These include the Master warning light (), the Forward Safety warning light (), and the Emergency Steering warning light (). A descriptive warning message will also persist for several seconds. If you see these alerts, please have your Kia K4 inspected by an authorized Kia dealer as soon as possible.

Forward Collision-Avoidance Assist disabled

	Driver Assistance system limited. Camera obscured.
	Driver Assistance system limited. Radar blocked.

The Forward Collision-Avoidance Assist system relies on clear sensor visibility to operate effectively. Environmental factors such as heavy snow, mud, or rain accumulating on the windshield (where the front camera is positioned), the front radar cover, or the bumper can significantly reduce detection performance, leading to a temporary limitation or full deactivation of the system in your Kia K4.

Should the system be affected, the instrument cluster will display a warning message accompanied by the Forward Safety warning light (), the Emergency Steering warning light (), and the Master warning light ().

In most cases, the Forward Collision-Avoidance Assist system will resume normal operation automatically once you have cleared the foreign material (such as snow or debris) from the sensors. However, if the system fails to operate correctly after the sensors are clean, or if you suspect obstructions from external accessories (such as a trailer or rear-mounted carrier), please contact an authorized Kia dealer to have your Kia K4 thoroughly inspected.

WARNING

Always be aware that the Forward Collision-Avoidance Assist system may not function as expected even if no explicit warning messages or indicator lights appear on your Kia K4 instrument cluster.

TIP

To verify the current operational status of the Forward Collision-Avoidance Assist system, you can navigate to the "Service" section within the utility information view on the Kia K4 instrument cluster display window.

Limitations of Forward Collision-Avoidance Assist ➤

Junction Crossing, Lane-Change Oncoming, Lane-Change Side, Evasive Steering Assist function: ➤

Evasive Steering Assist function:

Limitations of Forward Collision-Avoidance Assist

Other information:

Kia K4 (CL4) 2025-2026 Owner's Manual: Power window lock button

The primary driver can instantly disable the localized power window switches located on the rear passengers’ doors by engaging the master safety toggle switch. Pressing the power window lock button down into its locked position (fully depressed) intercepts the signal path to prevent rear cabin occupants from manipulating the glass regulators of your Kia K4.

Kia K4 (CL4) 2025-2026 Owner's Manual: With the mechanical key

When electronic proximity power is lost due to a dead transmitter battery or vehicle voltage depletion, the secondary backup physical security option allows full manual access. Please note that only the driver’s individual door can be locked or unlocked mechanically using the manual metal key blade assembly hidden inside your proximity transmitter.