From the Ford TSP:
12=Low Battery Voltage
Normal Operation
The air bag diagnostic monitor measures the voltage at Pin C1-13 of the air bag diagnostic monitor connector. Voltage at Pin C1-13 should be equal to B+. If the voltage measured at Pin C1-13 drops to less than 9 volts, the diagnostic monitor will flash out Code 12.
Possible Causes
Low battery voltage at diagnostic monitor Pin C1-13 can be caused by:
(1) Note: If fuse F36 is blown, make sure to diagnose the system for Possible Causes 1, 2 and 3.
(2) A short to ground in Circuit 29 (O) or 7 (Y/BK) may result in a blown fuse F36.
(3) An internal short to ground within the RH kick panel safing rear air bag sensor and bracket (14B007) may result in blow fuse F36.
(4) A short to ground on the battery feed Circuit 29 (O/GN) between the fuse and Pin C1-13 of the air bag diagnostic monitor may result in a blown fuse F36.
(5) A concern in the charging system causing battery voltage to drop below 9 volts.
96 Contour SE
Duratec V6 24-valve 2.5L ATX
108,000 mi.
Replaced: crankshaft w/ DMD, EGR valve (clogged), EVR, DPFE, PCV valve, evap emissions hose & tube (cracked), window regulator (broken), LH & RH PCV tubes, UIM gasket (leak), ignition coil
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