Q: I have a 1990 Mercury Grand Marquis. The airbag light has been blinking since I had the battery replaced. Some places online say I just need to have it scanned and reset. I'm not sure. Is there someplace that I can find what the blinking code is? It blinks 10 times then pauses, then 10 times and pauses, this continues until the car is shut off. This car has never been in an accident. This I'm positive of because it's been a one owner in the family since it was bought brand new in 1990. Thanks Everyone in Advance.
A: Probable Fault: Firing circuit disarm device blown due to deployment circuit shorted to ground. NOTE: A thermal fuse is built into the diagnostic monitor that opens the battery and power supply circuit to the air bag should a short occur in the air bag deployment circuit without a safing sensor being closed. This prevents unwanted air bag deployment due to damaged vehicle wiring. The Code 10 is a result of a short to ground, as described in the diagnosis for a Code 5 Code 10 is normally found after repair of a Code 5 condition. If the Code 5 is intermittent, just the Code 10 may be showing. Always look for shorts before repairing the Code 10, (replacing the diagnostic monitor). Since the thermal fuse is built into the diagnostic monitor, the monitor must be replaced to repair a Code 10. Refer to Code 5 diagnosis. See: 5 - Forward Crash Sensor/Ignition Ckt Short to Ground