Airbag error diagnostic low battery voltage code 12, pin 13 & 14 are only 2.8 volts on 95 Aerostar
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Airbag error diagnostic low battery voltage code 12, pin 13 & 14 are only 2.8 volts on 95 Aerostar
Searched other threads and internet, but no details on how to trace a low voltage causing an air bag diagnostic error code of 12 1-2. Any help appreciated!
My aerostar 1995 has low voltage on both pins 13 and 14 at only 2.8 volts. Voltage at pin 18 in 12.8 volts.
Pin 13 and 14 are only hot when key is in run position.
Pin 18 is hot all the time.
Pin 13 and 14 have no voltage at all if the airbag is disconnected using the bright yellow connector that runs up to the steering wheel column. This is true even if the key is in the run position.
I have reset all the connectors I can see. Fuses 5 and 10 are good.
I did find a interesting air bag code 12 schematic here but it is for a 95 mustang.
http://www.veryuseful.com/mustang/te...ode12Schem.jpg
More here:
Mustang 1995 Air Bag Diagnostic Codes
I also found this which mentions 2 different levels of low voltage on those pins for a Crown Victoria 1995, but it does not describe wiring enough to debug the aerostar wiring and uses different fuse numbers and amperage.
http://www.justanswer.com/ford/5xygw...bag-light.html
This would be the step I need for the Aerostar:
Check 10A battery fuse feeding air bag diagnostic monitor harness connector Pins 14 and 13.
Check power distribution fuse feeding the 10A fuse.
Is either fuse blown?
No
LOCATE and SERVICE open Circuit 38 (BK/O) or 937 (R/W) between positive (+) terminal of battery and Pin 14 of the air bag diagnostic monitor harness connector. Check in-line connectors, crimps, etc. CONNECT air bag diagnostic monitor. CYCLE ignition switch . PROCEED to the description, schematic, and pinpoint tests of the diagnostic trouble code that is flashing.
I guess what I need is other points to check voltage to see what is pulling 13 and 14 down to 2.8. I guess it could be the electronic module, but I would like to know how to test it for sure on an Aerostar.
My aerostar 1995 has low voltage on both pins 13 and 14 at only 2.8 volts. Voltage at pin 18 in 12.8 volts.
Pin 13 and 14 are only hot when key is in run position.
Pin 18 is hot all the time.
Pin 13 and 14 have no voltage at all if the airbag is disconnected using the bright yellow connector that runs up to the steering wheel column. This is true even if the key is in the run position.
I have reset all the connectors I can see. Fuses 5 and 10 are good.
I did find a interesting air bag code 12 schematic here but it is for a 95 mustang.
http://www.veryuseful.com/mustang/te...ode12Schem.jpg
More here:
Mustang 1995 Air Bag Diagnostic Codes
I also found this which mentions 2 different levels of low voltage on those pins for a Crown Victoria 1995, but it does not describe wiring enough to debug the aerostar wiring and uses different fuse numbers and amperage.
http://www.justanswer.com/ford/5xygw...bag-light.html
This would be the step I need for the Aerostar:
Check 10A battery fuse feeding air bag diagnostic monitor harness connector Pins 14 and 13.
Check power distribution fuse feeding the 10A fuse.
Is either fuse blown?
No
LOCATE and SERVICE open Circuit 38 (BK/O) or 937 (R/W) between positive (+) terminal of battery and Pin 14 of the air bag diagnostic monitor harness connector. Check in-line connectors, crimps, etc. CONNECT air bag diagnostic monitor. CYCLE ignition switch . PROCEED to the description, schematic, and pinpoint tests of the diagnostic trouble code that is flashing.
I guess what I need is other points to check voltage to see what is pulling 13 and 14 down to 2.8. I guess it could be the electronic module, but I would like to know how to test it for sure on an Aerostar.
Last edited by grostig; 07-11-2013 at 02:34 PM. Reason: add detail
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