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  • BMW Ignition wire

    Hi All,

    I am in the middle of setting up my second carpc. My previous used the carnetix PSU.

    I am now using the OPUS 120W with an EPIA board.

    I have checked my ignition wire with a multimeter and for some reason I am getting no voltage at all...

    Any ideas what the problem could be?

    Thanks,
    Paul.<br /><br />
    BMW E46 (year 2000)
    CARPC installed and working!!

  • #2
    Where did you check the wire ?
    Car pc integration with ease
    Car mediacenter

    Comment


    • #3
      I checked it first in the boot (where its extended to) but when I was getting no voltage, I tested it in the dashboard.

      Still no joy.

      Not sure what could have happenned as it definately worked previously.
      Thanks,
      Paul.
      BMW E46 (year 2000)
      CARPC installed and working!!

      Comment


      • #4
        fuse?

        where is the wire coming from?

        I had an E39 and the battery was in the boot. My E31 battery is also in the boot. Is it the same for the E46?
        Current:
        [BMW E46 ///M3 Convertible]

        Previous:
        [BMW E31 850CSi]|[BMW E39 535i]|[BMW HVAC Research]|[IBUS Scrolling Text]|[BMPuter]|[Velocity]|[TomTom]|[Vision]|[Space Navigator Driver]|[Super Fast Boot]

        Comment


        • #5
          Yeah, the battery is in the boot. I was hoping it would be a fuse but I am not sure which one... i may have to just pull each one out and check it.

          Its really bugging me, I dont want to use the switched line from my cigar lighter.
          BMW E46 (year 2000)
          CARPC installed and working!!

          Comment


          • #6
            you shoudln't need to. there are some relays there at the back. some that are on when you put the first ign on (the one you want) and some that switch on when the second notch is on (with the rest of the engine). If you get someone to turn key to position 1, then off, and you sit in the boot, then you should hear it. Put your finger on the case to feel the strongest click, and you know which one you need to branch off.

            that's how I did it with my E39 anyhow.

            The other thing is, whilst on the subject of power and BMW's. You car will switch off the lights inside the cabin off, after 15mins of no activity. This power is restored when you use your keyfob to open/close the door, or any activity. It's almost like a scrensaver!

            it's very useful for carpc's in 2 ways.

            1) you can have it power up your pc before you enter, and poweroff 15 mins after you leave it.

            2) use the power as you currently do, but also attach the cabin light weire to a relay, which powers the entire system. So if you leave your car and for some reason the pc stays on, then after 15mns everything will be shut off, no matter what. (this is how I had it, safest way - I did get a few flats you see!)
            Current:
            [BMW E46 ///M3 Convertible]

            Previous:
            [BMW E31 850CSi]|[BMW E39 535i]|[BMW HVAC Research]|[IBUS Scrolling Text]|[BMPuter]|[Velocity]|[TomTom]|[Vision]|[Space Navigator Driver]|[Super Fast Boot]

            Comment


            • #7
              Paul, I have an E46 and tapped into an ignition wire which I found in the boot on the left and top. I believe it was purple/white wire. My set up is a couple of years old. Power supply is using an ITPS board and tank battery. It works but was having problems. It might have been my wiring setup. The original setup was just straight 12V from the tank battery. On the 12V to power on the PC I tapped into the same always on 12V and connected it to a switch. I then connected this same 12V (on the off side of the switch) to the ignition 12V on wire. The PC would work most of the time. After a while while driving the car noticed that PC would boot on the power off. Nothing wrong with PC. I just disconnected 12V ignition on wire and it seemed to fix my problems. I was thinking now about maybe connected the 12V ignition on to a relay so that it wasn't directly connected.

              What wire are you checking for 12V ignition on?
              E83 - CIS-IBUS PC interface, AUX & CarPC. Purchased & pending - Angel eyes Pending: remote start.
              E46 - 16:9 display, CIS-IBUS, Radio to V53, AUX, USB IBUS interface,Mini ITX computer & remote starter.

              Comment


              • #8
                In BMW ACC comes only to the stereo in the dash.
                It does not go into trunk as all devices use IBus for such communication and device should be smart enough to shut itself after bus is silent for some time.
                If you have older stereo with round pins the ACC is pin 5 for flat pins 16.
                Good luck.
                Car pc integration with ease
                Car mediacenter

                Comment


                • #9
                  sama, any particular keywords (such as dimmer switch) or something I can use to research that particular line to tap into?

                  I think that's a great idea and I would like to incorporate that for the power as you suggest -- but certainly need to know which/how to find it.

                  Thanks.

                  Comment


                  • #10
                    It turned out to be the fuse for my stereo (this is where I have wired my ACC from directly into the boot).

                    Once i replaced the fuse.... it worked!!! Excecllent. :-)

                    CarPC is almost complete....
                    thanks for the help guys.
                    BMW E46 (year 2000)
                    CARPC installed and working!!

                    Comment


                    • #11
                      Jbors, with NAV my tuner sits in the trunk on the left hand side. The BMW audio amplifier is also there. I had both of those sources for a 12 V ignition on wire. Instead though I went to a connector in the trunk located close to left of one of the rear deck speakers. I did find the right color combination with the help of a another pair of eyes. I currently have it disconnected and decided to try to connect that source to a 12v relay to pass the 12v to the ITPS board. I should probably upgrade the power supply with an M2 and eliminate the ITPS board.
                      E83 - CIS-IBUS PC interface, AUX & CarPC. Purchased & pending - Angel eyes Pending: remote start.
                      E46 - 16:9 display, CIS-IBUS, Radio to V53, AUX, USB IBUS interface,Mini ITX computer & remote starter.

                      Comment


                      • #12
                        BMW ignition wire - and car2PC acc wire

                        Hi.

                        Apologies for resurrecting an old post, but I got here researching my problem with my car2pc adapter. I want my car2pc adapter to run in the boot, linked to my carputer. Not a lot to ask, I'm sure. But thing is, I cannot get the car2pc adapter to wake up with just the power to the unit fed from the car's ibus connection to the adapter. Inquiries with Car2PC have suggested that one should connect the ACC wire to the power wire on the ATX plug that connects to the adapter. If this is the case, why is there no cable in this position and why are there not more people complaining about this in the forums? I can't be the only one so afflicted surely???

                        Can anyone help?

                        TIA.

                        Comment


                        • #13
                          You have to use the ACC wire direct from the ignition. There is no wire already in the boot and as such you have to wire it yourself directly from the front of the car to the boot...

                          Any further questions then give me a shout.
                          Cheers,
                          Paul
                          BMW E46 (year 2000)
                          CARPC installed and working!!

                          Comment


                          • #14
                            re: ignition wire set

                            hi buddy! was trying to install a monitor in my car but ran into a problem. the ignition wire that runs into the stock radios harness is no longer getting power.my interior neon, and the old monitors power supply no longer get any current. the constant 12v is fine, just the ignition/acc wire. where do these wires run to so that i could check the source and see if its disconnected or anything? Any info would be greatly appreciated.

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