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  • Airbag/srs light help

    Hoping someone can help:
    Have a persistent airbag light that clears then pops straight back up again...the error issued is a "low supply voltage". Now, I have tried a system reset by disconnecting battery terminals and touching them together and leaving for a while. Also, the battery is nearly new with no problems, even trickle charged it overnight to be sure and my multimeter says its fine also. No other faults showing on reader just low supply voltage.
    Checked the little yellow clip thing on terminal too that disables car after a prang.

    Any ideas?

    Cheers, Ben.

  • #2
    the wiring loom under the seats can cause this....are you adjusting the seats?
    S50 Roadster....

    Comment


    • #3
      Originally posted by swamper View Post
      the wiring loom under the seats can cause this....are you adjusting the seats?
      No, the airbag light goes off with the reader reset then back on 5 seconds later still showing supply voltage?

      No seat faults showing on reader (the usual occupancy sensor or belt pre-tensioner cable etc)

      Any other ideas anyone?

      Comment


      • #4
        Could be a grounding issue. The ground point for the airbag system is below the center console and ahead of the shifter. If its come loose or gotten dirty it could cause a bad voltage reading.

        Comment


        • #5
          Originally posted by marty505 View Post
          Could be a grounding issue. The ground point for the airbag system is below the center console and ahead of the shifter. If its come loose or gotten dirty it could cause a bad voltage reading.
          Sounds like a bad connection somewhere, I recently had a "no supply voltage" fault, this was traced to no continuity through the slip ring. You'll need to do a load of resistance checks (or waggle some wires!!)
          2000 Cosmos Black S50, Kyalami/Black interior, KW V3s, H&R ARBs, Supersprint exhausts, Apex ARC8s.
          1996 Dark Aubergine Escort Cosworth Lux with leather, GGR 305 chipped, GGR/Koni suspension, Black Diamond discs.
          2008 Orange/Black Westfield Megabusa, FW rear, Widetrack/Nitron Suspension, AP/Westfield 4 pots.
          Lots of Land Rovers!
          No wife or kids!!

          Comment


          • #6
            My money is on the connection under the seat!!

            Comment


            • #7
              Originally posted by kwoffa View Post
              My money is on the connection under the seat!!
              Passenger seat? Can I simply disconnect the whole seat from the loom then reset the light to check or will being disconnected throw up another error.
              Any wires in particular? I know there is an occupancy sensor and the pre-tensioning connector too.

              Many thanks

              Comment


              • #8
                I'm not sure if the occupancy sensor will bring up a low voltage warning, but the pre-tensioner brings up a pre-tensioner fault, I know this as I have an intermittent fault with mine!
                2000 Cosmos Black S50, Kyalami/Black interior, KW V3s, H&R ARBs, Supersprint exhausts, Apex ARC8s.
                1996 Dark Aubergine Escort Cosworth Lux with leather, GGR 305 chipped, GGR/Koni suspension, Black Diamond discs.
                2008 Orange/Black Westfield Megabusa, FW rear, Widetrack/Nitron Suspension, AP/Westfield 4 pots.
                Lots of Land Rovers!
                No wife or kids!!

                Comment


                • #9
                  I went thru this a couple of times.. and when either seat is moved and the female part of the seat belt is pulled it activates the warning..i have read somewhere that making the connections longer stops this from happening in the future! however it is always best to check that the female part is not trapped....i am sorry that i cannot be specific in what wires do what!

                  Comment


                  • #10
                    Assuming your fault reader is correct it cannot be a fault with the seat wiring.

                    It's saying there's poor voltage to the control unit, not resistance problems.

                    I would try a different fault reader, ideally GT1, if that shows the same fault & doesn't allow it to be cleared you have git a wiring fault with the supply voltage to the control unit or faulty control unit.

                    Comment


                    • #11
                      Originally posted by Jwx View Post
                      It's saying there's poor voltage to the control unit, not resistance problems.
                      If there is a poor connection, there will be too much resistance, which will lead to poor voltage!!
                      2000 Cosmos Black S50, Kyalami/Black interior, KW V3s, H&R ARBs, Supersprint exhausts, Apex ARC8s.
                      1996 Dark Aubergine Escort Cosworth Lux with leather, GGR 305 chipped, GGR/Koni suspension, Black Diamond discs.
                      2008 Orange/Black Westfield Megabusa, FW rear, Widetrack/Nitron Suspension, AP/Westfield 4 pots.
                      Lots of Land Rovers!
                      No wife or kids!!

                      Comment


                      • #12
                        Ok, update for anyone with the knowledge:

                        Checked the following:

                        Grounding and supply to airbag module

                        Removed passenger seat, all wiring and clips in place and not pulled or crushed.

                        Battery checked and charging system

                        Fuses to airbag system

                        Done a system reset (disconnect battery etc)

                        Airbag light still pops straight back up after reset but I have some other things for you to take into account.

                        I replaced the drivers door window and had to turn on ignition to lift window mechanism with the door panel air-bag removed, this obviously triggered a fault in which I planned to clear, in the meantime the battery went flat but has since been on a top of the range ctek conditioner and is now fine, full voltage/amps/holding charge etc. I cleared the faults associated with the airbag being removed but have not been able to clear the supply voltage fault since.

                        Do you think my module is f@**•d?

                        Many thanks

                        Ben.

                        Comment


                        • #13
                          The part looks to be cheap on ebay so may be worth trying a swap

                          Comment


                          • #14
                            Have you tried supplying a 12v live and an earth direct to the ECU from the battery?
                            2000 Cosmos Black S50, Kyalami/Black interior, KW V3s, H&R ARBs, Supersprint exhausts, Apex ARC8s.
                            1996 Dark Aubergine Escort Cosworth Lux with leather, GGR 305 chipped, GGR/Koni suspension, Black Diamond discs.
                            2008 Orange/Black Westfield Megabusa, FW rear, Widetrack/Nitron Suspension, AP/Westfield 4 pots.
                            Lots of Land Rovers!
                            No wife or kids!!

                            Comment


                            • #15
                              Originally posted by Limbs View Post
                              Have you tried supplying a 12v live and an earth direct to the ECU from the battery?
                              No, that sounds pretty risky? I know my luck and would probably trigger the airbags. There are so many wires I wouldn't know which ones are the supply?

                              Comment

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