Need Help Solving SRS Air Bag Code

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93mark8rules

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I have a 94 Mark 8, I got into a fender bender about a year ago and set off both air bags... Recently I tracked down a pair of air bags and one crash sensor decided to try replacing them. I unplugged my battery for a half hour to be sure, then swapped them all out. I tested the sensor before I installed it and it had continuity on 2 pins but not on any of the other pins, and then I checked the drivers side one that was original to the car and it tested the same way. When I first started the car I got code 35, from what I understand this is the passenger Air bag I just installed, then after I drove the car to get something to eat, and parked it, I came out and started it and got code 41 which is one of the sensors. Now I went outside and started it again and got 35. Is it normal for the codes to change like that? Is it possible that the safing sensor is the issue? When I bought the car it had an airbag code to I just dont remember what it was, but maybe its the module? Im not sure what do you guys think?
 
Make sure the new sensor is grounded well.
It grounds through the body not the wires.
 
Whats the best way to check it? If I unplug the harness from the computer under the dash, can I test for the sensor ground? Also Im guessing I should be able to use a meter and check for ground through the Negative battery cable to one of the pins on the sensor, just not sure which ones should have it. Id like to check all the wiring because Im wondering if the air bag computer is just going bad.
 
I understand that, but doesnt the computer read that ground to know the sensor is grounded correctly?
 
I finally solved the Air Bag Problem.... It was a few things. The car had a code for 35 and a code 41. 35 is the passenger airbag, and 41 is the passenger front sensor. So I broke down and bought the Ford Wiring Manual, if you disconnect the harness from the sensor the top pin that is by its self is the ground pin. Stick the meter on that and then to the DISCONNECTED negative battery terminal and check for continuity, it should read 0 ohms of resistance. Mine did, then I hooked up the harness and poked the wire on the harness end to check for ground and that one was good then I checked all the other wires from the sensor, the other 2 should read continuity to eachother and not to ground. I checked them at the other side of the plug. Then I put it all together and turned the car on first I got code 35, after I let it blink a little and shut of fthe car then restarted it the only code was 41 over and over. I think Code 35 may also double as a power loss code. So I got frustrated and checked continuity back to plug 277 at the module and everything had continuity so I knew the harness wasnt broken.

So I got angry and pulled an air bag computer out of the junkyard and hooked it up. First thing was code 35. Cycled the ignition once now it said code 45. 45 is the drivers side sensor. So I did my test same as last time, and everything was cool but I was reading.050 ohms of resistance to ground. I pulled the sensor off the bracket and used a wire brush on the bracket until there was shiny steel, then took the bolts and cleaned them with a wire wheel, and cleaned the sensor bracket up a little bit also. Put a thin film of Dielectric grease inbetween the bracket and sensor and on the bolts tightened it up and got 0hms of resistance. Put everything back together. Turned the car on got code 35. Turned it on and off again and now no more codes...

SO heres my findings to help the next guy. My computer did indeed crap out, I hooked it back up after everything was fixed and it still had codes. .050 is enough to trigger the improper mounting code. I found the list of codes on TCCOA but cant find them at the moment. Also that once the computer loses power the first time it gets it back it will flash code 35.
 
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