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    #1

    ABS Overvoltage Relay Issues

    This all started a while back when my ABS overvoltage relay fried its little fuse. I replaced it and then about 3 months later it went out again. I replaced it yet again and about 2 days after replacing it, the ABS light pops on again.

    I have a few questions:

    Does anyone know what kind of fuse goes in that relay so that I could possibly solder in one myself instead of buying a new $25 dollar relay each time?

    Also, I was wondering if anyone has any idea what would cause this to happen in the first place. Each time it died I was driving normally though when it died the conditions were pretty wet outside (I'm not sure if this has anything to do with it considering the conditions are wet very often in Washington).

    So far the suggestion I have had are to test each wire involved in the ABS system to look for what might be causing the spike. That or seeing if replacing the whole computer does anything. I have checked each of the sensors on the wheels and cleaned them and have not been able to find any shorts or anything like that. I had the car for about a year before it started setting off the ABS light.

    Thanks.
    Tags: None
    #2
    Well If your relay is the metal case type, then all you have to do is gently take the case off and there's a small gauge wire (not a real fuse) on the side, just resolder a similar gauge wire in it's place. I've done it twice. This may sound stupid to others, but what caused it was the relay wasn't clipped securely either time, and bumped the metal case under it, blowing the fuse. Now that I've got it securely fastened it hasn't blown or thrown on the light once.

    Sarcasm is a body's natural defense against stupid.
    When a man talks dirty to a woman, it's sexual harassment. When a woman talks dirty to a man, it's £3.95 per minute.
    "My mother never saw the irony in calling me a son-of-a-bitch." Jack Nicholson"
    Old age and treachery will always overcome youth and skill.

    Comment

      #3
      Do you happen to know what guage the wire was? I have opened the relays each time and the wire is completely gone, only two solder spots on each side and a burn mark.

      The being securely clipped thing could be contributing problem, though I don't really see how that causes the wire to fry.

      Comment

        #4
        I just thought I had one of those anonymous shorts that is nearly impossible to find, and isn't noticable. You know everything is working fine, but you see something odd anyway. That kind of thing. I find it to be pretty common with my E30 anyway.

        As I recall, I looked through my "wire collection", and ended up using one copper strand from a piece of 18 gauge wire as a replacement. You'll probably want to pull your gound on the battery when you replace it too.

        Sarcasm is a body's natural defense against stupid.
        When a man talks dirty to a woman, it's sexual harassment. When a woman talks dirty to a man, it's £3.95 per minute.
        "My mother never saw the irony in calling me a son-of-a-bitch." Jack Nicholson"
        Old age and treachery will always overcome youth and skill.

        Comment

          #5
          can i get a good explanation of where this is? i have a random black plastic relay hanging down from my steering column area...
          and my friend has an earlier model car with a metal looking relay in the same area..

          i thought mine was an alarm relay or something, since theres a non-active alarm system that was previously installed there...


          a pic of the relay, Part number, or good explanation would do wonders for me trying to figure out why my ABS light is on too..

          it has been since ive had the car for 3 yrs or so

          Thanks

          Comment

            #6
            Mine's on top of the abs control unit under the steering column. Some are black plastic, others are metal.

            It'll shoot if the car's jumped. That's probably what happened. Sorry my camera is defunct so no pics. Check realoem.com for the part#.

            Sarcasm is a body's natural defense against stupid.
            When a man talks dirty to a woman, it's sexual harassment. When a woman talks dirty to a man, it's £3.95 per minute.
            "My mother never saw the irony in calling me a son-of-a-bitch." Jack Nicholson"
            Old age and treachery will always overcome youth and skill.

            Comment

              #7
              found it..

              it was hiding behind the Ultra large plate of spaghetti wires from the aftermarket nonworking alarm..

              right on top of the abs module computer..

              Comment

                #8
                Where is this relay? I have a 1989 325is and I can't find it. I have a metal cased ABS computer.


                Where the hell is #13? I pulled out the control unit #14, but can't find #13.

                Tell me what you see...



                E30 Wiki: e30dohc.com/wiki

                Comment

                  #9
                  For some reason I can't see your pics. The relay should be right on top of your ABS control unit the metal box to the left under the dash.

                  Sarcasm is a body's natural defense against stupid.
                  When a man talks dirty to a woman, it's sexual harassment. When a woman talks dirty to a man, it's £3.95 per minute.
                  "My mother never saw the irony in calling me a son-of-a-bitch." Jack Nicholson"
                  Old age and treachery will always overcome youth and skill.

                  Comment

                    #10
                    Originally posted by lordofthewaters View Post
                    For some reason I can't see your pics. The relay should be right on top of your ABS control unit the metal box to the left under the dash.
                    The pictures are big. So this relay is just resting on top of the ABS unit? Is it hooked to some cable? I took out the ABS unit, never saw any relay.

                    Maybe get the picture link and paste it into your address bar? The pictures show pretty much what I see.
                    E30 Wiki: e30dohc.com/wiki

                    Comment

                      #11
                      Reason found:
                      No power was getting to the ABS thanks to my engine swap.

                      I gave power to the ABS wire and now the light's out!

                      Also, the my car, a 1989 year, didn't have that relay.
                      E30 Wiki: e30dohc.com/wiki

                      Comment

                        #12
                        yeah, later cars don't have an ABS relay.
                        Build thread

                        Bimmerlabs

                        Comment

                          #13
                          When did this happen? Mine's an 89 325i and it has it? Although it WAS built in October of 88. The relay kind of clips onto the bracket that the ABS box bolts to.............

                          Sarcasm is a body's natural defense against stupid.
                          When a man talks dirty to a woman, it's sexual harassment. When a woman talks dirty to a man, it's £3.95 per minute.
                          "My mother never saw the irony in calling me a son-of-a-bitch." Jack Nicholson"
                          Old age and treachery will always overcome youth and skill.

                          Comment

                            #14
                            Originally posted by lordofthewaters View Post
                            When did this happen? Mine's an 89 325i and it has it? Although it WAS built in October of 88. The relay kind of clips onto the bracket that the ABS box bolts to.............
                            you sure it's the ABS relay? there's also sometimes an interior light delay relay that is right next to the ABS computer.
                            Build thread

                            Bimmerlabs

                            Comment

                              #15
                              Nope it's the ABS relay because I shot the fuse in it when I jumped it the first time, and the ABS light came on. Soldered a new one in and it went off.

                              Sarcasm is a body's natural defense against stupid.
                              When a man talks dirty to a woman, it's sexual harassment. When a woman talks dirty to a man, it's £3.95 per minute.
                              "My mother never saw the irony in calling me a son-of-a-bitch." Jack Nicholson"
                              Old age and treachery will always overcome youth and skill.

                              Comment

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