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    #1

    Airbag light

    The airbag light in my 91 Grand marquis LS is always on when the car is running. Is there anything I could check before I just pull the bulb out? I'm not too concerned that the airbag won't work, but the light is just an annoyance. I haven't got my shop manuals yet so I don't have any schematics to know what could be the issue. Any info would be greatly appreciated.

    -Rob
    Tags: None
    #2
    I take it it's blinking right? Count the number of times it blinks.

    2 - All Primary Crash Sensors Disconnected.
    3 - Air Bag Deployment Circuit - Low Battery Voltage or Low Backup Power Supply Voltage
    4 - Safing Sensor - Diagnostic Circuit Open or Low Primary Crash Sensor Resistance
    5 - Air Bag Circuit or Crash Sensor Circuit - Shorted to Ground
    6 - Driver-Side Air Bag Circuit - Open or High Resistance
    7 - Passenger-Side Air Bag Circuit - Open or High Resistance
    8 - Primary Crash Sensor - Not Mounted to Vehicle Properly
    9 - Primary Crash Sensor Circuit - Open or High Resistance
    10 - Diagnostic Monitor Internal Thermal Fuse - Open Due to Intermittent Short to Ground

    Also, note that you can't just pull the bulb to get rid of that annoying light. The Airbag module checks resistance across the Airbag light circuit, and removing the bulb makes it very angry. And by angry it will make the most insufferable beeping know to man.
    2020 F250 - 7.3 4x4 CCSB STX 3.55's - BAKFlip MX4
    2005 Grand Marquis GS - Marauder sway bars, Marauder exhaust, KYB's
    2003 Marauder - Trilogy # 8, JLT, kooks, 2.5" exhaust, 4.10's/31 spline, widened rear's, metco's, addco's, ridetech's 415hp/381tq
    1987 Colony Park - 03+ frame swap, blown Gen II Coyote, 6R80, ridetechs, stainless works, absolute money pit. WIP

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      #3
      That is interesting. So, if mine is blinking three times, what is broken, and how do I fix it. (I sure didn't know we had all that high-tech stuff on our old boxes.. cool!)
      If you're gonna be dumb, you gotta be tough...

      Comment

        #4
        Mine is not blinking at all. Just constantly on all the time.

        Comment

          #5
          3 times means the capacitor thats used for the backup supply is bad, or its unplugged. Find the bomb control unit and about 3" from it will be another box with a small cord connecting to the main bomb control. Thats the backup supply. if its plugged in, then you probably need to replace or rebuild it. Its just a couple of capacitors inside the box, about $15 in parts from digikey or mouser.


          beastiezzz: never seen one on constantly. Maybe someone pulled the fuse? don't have a book that covers the 91 grand marq so I know not its bomb circuits.
          86 Lincoln Town Car (Galactica).
          5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

          91 Lincoln Mark VII LSC grandpa spec white and cranberry

          1984 Lincoln Continental TurboDiesel - rolls coal

          Originally posted by phayzer5
          I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

          Comment

            #6
            Thanks Gadget. I'm not sure I'm ready to dive back in to my dash quite yet, though. I'm still healing...
            If you're gonna be dumb, you gotta be tough...

            Comment

              #7
              Thanks also to Pantera or the inside info...
              If you're gonna be dumb, you gotta be tough...

              Comment

                #8
                Well I asked the original owner of the car what the airbag light was about and he told me the following. He replaced both the airbag and the clock spring and then after all that about a month after that he said the light went on and this time it was some sort of 'air bag module' that's located on the underside of the passenger side dash. I did some searching around the web and was only able to find a crash sensor. Is that the part that i'm looking for or is that the safety switch in the trunk?

                Comment

                  #9
                  air bag module should be behind the glove box. I dunno if the 91 has the same general idea as the 93/94, but I would think it's similar.

                  If it is... the module box is probably blue.

                  Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
                  rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)

                  Originally posted by gadget73
                  ... and it should all work like magic and unicorns and stuff.

                  Originally posted by dmccaig
                  Overhead, some poor bastards are flying in airplanes.

                  Comment

                    #10
                    I going to take a look when I get back from the first road trip for me and my girl with this car. I'm only taking it about 2 hours away but that's alot further then I've taken it yet so hopefully all goes well. I just did some basic maintenance today along with a tune-up and I'm glad I did. While changing the air filter I saw some oil in the duct that goes to the throttle body. I didn't think that was good so I took the intake hose off of the throttle body to find oil in front of the throttle plate along with alot of other gunk so I cleaned it all out and as much as I could while reaching behind the plate. The throttle response was sluggish before and now its alot better and seems to be happy with some fresh oil in there. Anyway I hoping to have an event free trip along with some relaxation so I'll get back on here when I get back home. Do you think that I should put an oil separator in there to prevent the oil from getting back up into the intake?

                    Comment

                      #11
                      nah... replace the PCV valve, grommet, and screen if you haven't already. That will solve that problem.

                      Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
                      rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)

                      Originally posted by gadget73
                      ... and it should all work like magic and unicorns and stuff.

                      Originally posted by dmccaig
                      Overhead, some poor bastards are flying in airplanes.

                      Comment

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