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Ford and GM often permanently "marry" the electronic and hydraulic portions of the module making rebuild more difficult as the 2 halves require a different procedures and skillsets to repair (1 is a computer board with chips and circuits, 1 is a hydraulic pump and mechanical valve assembly with some solenoids). You can try BBA-REMAN.COM, they may be able to rebuild it for you, but the majority of rebuilders out there prefer to stick with electronic only rebuilds (Typically european cars all use bosch style seperateable units available as exchange at many rebuilder shops). You may end up with faster luck trying to locate a used unit at a local junkyard that offers say a 30 day guarantee.
Have you verified that the wheel signals are in fact present and are reaching the module? Wheel speed is calculated seperately for each wheel, and processed seperately. It is rare (though not unheard of) for a module to fail in a manner that disables all sensors at once. Typically a module that has lost ability to process a signal or is grounding a signal internally will affect only 1 or 2, and the others will continue to function normally. Also solder cracks on the board are not uncommon, though again that would be very rare to affect all 4 at once.
I was unable to locate code 31 in my book here is a copy of the codes. looks like you just need a fuse for #51. this may fix 31 as well.
Diagnostic Trouble Code Table 1994
AIR BAG DIAGNOSTIC MONITOR DIAGNOSTIC TROUBLE CODE PRIORITY TABLE Priority Code Component/Fault Description Highest - No Air Bag Indicator - Inoperative Lamp Circuit or No Ignition Voltage to Air Bag Diagnostic Monitor
Continuous Air Bag Indicator - Air Bag Diagnostic Monitor Disconnected or Inoperative 12 Low Battery Voltage 13 Air Bag Circuit Shorted to Ground 14 Primary Crash Sensor Circuit Shorted to Ground 21 Safing Sensor Not Mounted to Vehicle Properly 22 Safing Sensor Output Shorted to Battery Voltage 23 Safing Sensor Circuit Input Feed/Return Circuit Open 24 Safing Sensor Output Feed/Return Circuit Open 32 Driver Side Air Bag Module High Resistance or Open 33 Passenger Side Air Bag Module High Resistance or Open 34 Driver Side Air Bag Module Circuit Low Resistance or Shorted 35 Passenger Side Air Bag Module Low Resistance or Shorted 42 Center Radiator Primary Crash Sensor Feed/Return Open 44 Center Cowl Primary Crash Sensor Not Mounted to Vehicle Properly 45 Center Radiator Primary Crash Sensor Not Mounted to Vehicle Properly 51 Diagnostic Monitor Internal Thermal Fuse - Fuse Blown Due to Intermittent Short to Ground 52 Backup Power Supply - Voltage Boost Fault 53 Primary Crash Sensor Circuits - Resistance to Ground or Air Bag Diagnostic Monitor Failure
Lowest - Rapid Continuous Flashing of Air Bag Indicator (No DTC) All Primary