Ford E-250 Econoline seat belt alarm continuously sounding possibly due to green box under dash on Ford E-250 Econoline

Submitted by Vehicle Owner · Jun 23, 2025
Published by RepairPal

Problem overview

Some Ford E-250 Econoline owners report experiencing continuous seat belt alarm issues, which may be linked to problems with the seat belt buckle or the seat occupancy sensor. A common cause of the alarm is a faulty driver's belt buckle, which can lead to intermittent flashing and alarming. Additionally, the alarm may sound if the driver forgets to buckle up, in which case fastening the seat belt will stop the alarm. The Ford belt monitor system is designed to alert occupants when seat belts are not properly fastened, monitoring usage for all passengers. Owners suspecting that the green box under the dash may be related to the alarm should check its connection to the seat belt monitoring system. It is crucial to address the underlying causes of the alarm, including inspecting the seat belt buckle, occupancy sensors, and related wiring for any faults. Consulting a qualified mechanic or the vehicle's manual is recommended for troubleshooting and resolving these issues.

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