My 92 town car is flashing a 9 on the air bag light (This is a single digit
error system). This is suppose to indicate the crash sensors are
disconnected. I have metered out the three crash sensors from the
diagnostic module plugs, and they are all the same (good). I have replaced
the diagnostic with two others (salvage yard) and they report the same. I
would appreciate any help what other problem may cause this error.
It means the primary crash sensor is open or high resistance. Not all the
sensors just the primary. The problem trying to meter the sensors at the module
plug ( I'll assume you are trying to measure ohms ) is that when you disconnect
the plug from the module a bridge closes across the terminals in the harness
plug. Because of this all your meter readings will be the same and lead you to a
false conclusion. Here is another problem the 92 town car went to a two digit
code. So it is important to know the if the car was built after 11/5/91 or
before. You could have very easily misinterpreted the flash code as a 09 when in
fact it should be 45 which is primary crash sensor #2 not properly mounted.
Been there and done that with a taurus. You need to take off each
sensor, and clean the area under it with a light sand paper or such
to get the rust off the mount. Then bolt it back down solid. You should have a
left , right and center. The center one could be on top of the radiator or the
fire wall. Look for blue arrows pointing forward on the crash sensors. The
center is is probably the one with the extra set
of terminals that has the safing sensor and checks for the bad ground.
If that does not do it, change the air bag diagnostic module. (Blue module
probably behind the glove box, check your manual).
Unhook the battery for a hour before doing any air bag work to be safe. In my
case, i cleaned and swapped all the sensors and it did not
change the symptom. After i changed the diagnostic module, the blinky code went
away. It helps to have a donor car to pilfer parts from.
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