F 250 4WD Pickup V8-7.3L DSL Turbo VIN K (1994)
Air Bag Control Module: All Technical Service Bulletins
Airbag System - Code 51 Diagnostics/Repair
Article No.
95-4-8
02/27/95
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RESTRAINT SYSTEM - AIR BAG MODULE - DIAGNOSTIC CODE 51 - IMPROVED DIAGNOSTICS AND REPAIR
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AIR BAG - DIAGNOSTIC CODE 51 - IMPROVED DIAGNOSTICS AND REPAIR
LIGHT TRUCK:
1994-95 BRONCO, F-150, F-250
ISSUE:
The air bag diagnostic light may flash on some vehicles. The air bag warning indicator may flash as follows:
^
Five (5) flashes, followed by
^
a 1 second pause, followed by
^
a single flash, then
^
the sequence repeats itself.
This may be caused by a previously-repaired short-to-ground or intermittent short-to-ground in the air bag wiring. Air bag diagnostic monitors displaying
Diagnostic Code 51 are repeatedly being replaced without having first corrected a possible short-to-ground or intermittent short-to-ground in the system.
ACTION:
Deactivate the air bag system and check for and repair any possible shorts to ground in the air bag wiring. Replace Diagnostic Air Bag Module,
reactivate the system and perform an air bag system prove-out. Refer to the following for detailed service procedures.
GENERAL INFORMATION
The diagnostic monitor contains an internal thermal fuse that is not serviceable. The thermal fuse is controlled by a computer inside the diagnostic
monitor. The computer will open the thermal fuse whenever a short on the deployment circuits occur. The thermal fuse does not open because of
excessive current flowing through it. Do not attempt to jump the thermal fuse with a circuit breaker or any other type of fuse.
WARNING:
DO NOT INSTALL A NEW DIAGNOSTIC MONITOR UNTIL THE CAUSE OF CODE 51 HAS BEEN LOCATED AND REPAIRED. IF A
SHORT-TO-GROUND HAS NOT BEEN LOCATED AND REPAIRED, THE SHORT IS INTERMITTENT AND IS NOT PRESENT AT THIS
TIME. INSTALLING A NEW DIAGNOSTIC MONITOR WITH AN INTERMITTENT SHORT IN THE SYSTEM WILL RESULT IN REPEAT
BLOWN THERMAL FUSES IN DIAGNOSTIC MONITORS AND REPEAT SERVICE.
