Code 51 - Diagnostic Monitor Internal Thermal Fuse Open: Notes

WARNING: This page is about a different car, the 1995 Ford Pickup, 1995 Ford F-Super Duty, 1995 Ford Cab & Chassis, and 1995 Ford Bronco. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Before proceeding, read and understand all air bag service precautions. See SERVICE PRECAUTIONS . After servicing has been performed, recheck AIR BAG warning light for codes with Air Bag Simulator (105-00010) still in place of air bag module. If system checks okay, install air bag module and reactivate air bag system.

NOTE: A thermal fuse is built into the diagnostic monitor. If a short to ground should occur in air bag deployment circuit, microcomputer in diagnostic monitor will send a signal to the fuse, causing it to open. The open fuse removes all firing power (battery/back-up power) from deployment circuits. This prevents unwanted air bag deployments due to damaged vehicle wiring.

CAUTION: Never replace diagnostic monitor without first determining cause for Code 51 condition. If short to ground is not properly serviced, short may reoccur, once again destroying diagnostic monitor thermal fuse.