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  • Door locking by them self

    I have a problem with the drivers door not sensing that it has opened , then after 30 sec all door lock. All the other doors work fine, just the drivers door sensor doesn't work. Dome light doesn't come on, drivers door only. I swapped the door switch , so that is not the problem. It must be a fuse or relay on the drivers door to the BCM. But where? Any help would be great.
    Thanks GB

  • #2
    Re: Door locking by them self

    I can't help I'm afraid, but i have the same problem with the rear drivers side door, So I will follow this thread with interest.

    Cheers,

    Will

    Comment


    • #3
      Re: Door locking by them self

      I would guess that the problem might be in the remote door unit in the door...but you said that you changed from one door to the other. I think that the road is not making contact enough with a limit switch to show that it was opened. It could be in the part of the door handle itself? see picture below and web site that might be of assistance.


      http://www.toyodiy.com/parts/p_G_2007_T ... _6753.html
      Manata 3" Exhaust, Blisten shocks, King Springs 50 mm lift, Poly Air Bags, Roof Rack, Iron Man Bull Bar, HID 50W LightForce XGT spotties, Daul Batteries, GME TX3440 & AE4705 ant, Upgraded window washer, Bonnet Scoop, Tunit chip, bonnet protector, headlight protector, Cooper STT's, ScangaugeII, Dash Mat, Endless Air, Stebel Nautilus, Diff Breathers, Water Sedimentor. ([b]Camprite TL8s [/b] Arrived ALIVE~!)

      Comment


      • #4
        Re: Door locking by them self

        All the doors have a switch on the pillar that grounds to earth when you open the door, all this works. It must be a problem with the circuit, from the Body control module back to the little light in the door skin. (Drivers door only). All other doors work fine. Door switch was swapped so that is fine too.

        Comment


        • #5
          Re: Door locking by them self

          GeeBee,
          You said that it grounds...I would almost bet you have an intermitant ground problem. I would try and take that off and clean it up and try again.
          Manata 3" Exhaust, Blisten shocks, King Springs 50 mm lift, Poly Air Bags, Roof Rack, Iron Man Bull Bar, HID 50W LightForce XGT spotties, Daul Batteries, GME TX3440 & AE4705 ant, Upgraded window washer, Bonnet Scoop, Tunit chip, bonnet protector, headlight protector, Cooper STT's, ScangaugeII, Dash Mat, Endless Air, Stebel Nautilus, Diff Breathers, Water Sedimentor. ([b]Camprite TL8s [/b] Arrived ALIVE~!)

          Comment


          • #6
            Re: Door locking by them self

            I took the door switch off and replaced it with the rear door switch , checked it works on the rear door and it did. Then swapped it back. The switch works, the message just don't get back to the body control module to tell it the drivers door has been opened , to turn the lights on, and not lock, and also turn the head lights off if they were on. There must be an inline fuse or relay somewhere in this circuit.

            Comment


            • #7
              Re: Door locking by them self

              It is either not earthing properly or not getting voltage to the switch.

              Rather than changing switches and assuming it is earthing because the switch worked on another door, get a piece of wire and connect door switch directly to the battery negative. This will check the entire return path.
              If taking the ground directly to the battery negative does show a problem in the return path then start checking the supply. Start but checking if there is voltage at the door switch.

              Leachy
              EX-Prado Owner

              Comment


              • #8
                Re: Door locking by them self

                Thanks leachy.

                I sort of did that. I used a test kit with a light in it to check if there is 12v at the door light. One end of the lead was connected to ground , and when I touched 12v point on the door light the lead lid up. So there is 12v at the light, but when I touched the earth wire at the light it should ground the whole circuit which it did but , the door light was not bright,So I not sure if it was just because I used the test lead with if's own resistance or not. But I will try running a wire from the battery to check. But sill that doesn't tell me where the problem lies.

                Comment


                • #9
                  Re: Door locking by them self

                  I have looked at this when I installed my car alarm. Each door is seperately wired back to the body ECU.
                  There are no fuses but quite a few connectors involved.

                  Each door is wired indiviually to the ECU so that the ECU knows which door has been opened and turns on the
                  light in that door only.

                  The ECU also operates the door ajar lamp on the dash and controls the central looking. Also tells the company
                  fitted alarm unit a door has been opened though I don't know if any Australian models are fitted with a companty alarm.

                  For those with after market alarms fitted, a lot of installers don't realise each door is individually wired and only connect
                  the alarm to the drivers door. If you open one of the others the alarm will not go off!

                  To aid your fault finding open the door, if the door open light comes up in the dash then the signal is getting to
                  the ECU ok and either the ECU is not operating the door light or there is a wiring problem between the ECU and the
                  door light.

                  If the dash light doesn't come on then the problems between the door and the ECU or again the ECU is faulty. As you
                  have indicated the other doors work ok then the fault will most likey be a wiring fault.

                  For those that find there alarm is not wired to each door the most eligant way to get the alarm to function
                  is to connect the alarm trip to the Body ECU output that drives the door open led in the dash panel, else you will
                  have to diode each door switch and cable back to the alarm unit, a lot of work and probably why the alarm installers
                  don't do it.

                  Cheers

                  LeighW
                  HKB Electronics, manufacturer of the Alternator Voltage Booster, Silver 2008 D4D,Lifted,Underbody protection, Alternator Voltage Booster, Tiger Z winch, Lightforce DL, Air Horns, Tanami Drawers, Drop down fridge slide, Outback cargo barriers, Rotronics dual Battery system, Polaris GPS, HF/UHF/VHF, Radio speaker combiner, Long ranger water tank, Diff breathers, Inverter, Snorkel and others

                  Comment


                  • #10
                    Re: Door locking by them self

                    Hi Leighw

                    All you said was spot on. When I open the drivers door the dash light does not come on. All other door do. Everything you said was accurate , but you got me no closer to fixing the problem. It was a short between 12v and earth at the little light in the door that started this. That's why I think it is a fuse. All other doors work fine so I'm looking for a fuse or relay in line from the drivers door to the Body control module (ECU). Thanks for the input.

                    Comment


                    • #11
                      Re: Door locking by them self

                      All the courtesy lights are supplied from the same 10A fuse and this supply is independent from the supply to the ECU. So a short in the courtesy light should have no effect on the door switch signal to the ECU

                      There is no fuse or relay between the ECU and the door switch. The wire comes from the ECU (pin 24 for the RH front door) via a connector to the door switch. As Leigh said each door switch is wired back to the ECU individually.

                      If there is no voltage at the door switch then you have a bad connection / broken wire between the ECU and the door switch - start tracing the wire back.

                      If there is voltage at the door switch then the problem is in the earth return path - start shorting out the return path until you isolate where the fault is.

                      The final possibility is a fault in the ECU on just the RH driver door courtesy switch input – which seems extremely unlikely


                      Leachy
                      EX-Prado Owner

                      Comment


                      • #12
                        Re: Door locking by them self

                        Hi all,

                        Don't like to be the bearer of bad news but if you had a short circuit on the light
                        in the door I would suspect you have blown the driver circuit in the body ECU for
                        the door concerned.

                        With regard to using the dash door open light to help in locating the problem, the body ECU
                        could be configured in different ways to perform this function, ie all inputs could be commoned
                        internally to operate the dash lamp or alternatively all outputs could be commoned to bring up the
                        lamp. In the first instance your door signal not getting to the ECU would be the problem, in the
                        second case an internal fault in the ECU could be the cause. Unfortunately as leachy_9 wrote there
                        is no fusing between the body ECU and the light to protect the ECU. The ECU most likely turns on a
                        transistor which powers the light in the door, there may also be a surface mount fuse on the circuit
                        board of the ECU to protect the ECU. A prolonged short across the globe would most likely have blown
                        the transistor or fuse and in either case it will be a difficult repair.

                        The only way to to be sure is to check the pins on the connector of the body ECU. If you open the
                        door concerned and you don't see the earth on the correct input into the ECU then the fault is in
                        the door to ECU wiring. If you see the earth on the input then look for the positve output on
                        the correct output pin on the body ECU and if it's not there then the ECU is faulty if it is there then
                        the the wiring between the ECU and the door light is faulty.

                        I suspect you will need a new ECU module or if you do a search on this site for help with fixing
                        a tacho there is a mention of a company who repaired his instrument panel. They maybe also able
                        to repair the body ECU.

                        Obviously be very careful when checking for potentials on the ECU pins as any shorts between
                        pins or to earth or stray positive potentials can damage the ECU.

                        LeighW
                        HKB Electronics, manufacturer of the Alternator Voltage Booster, Silver 2008 D4D,Lifted,Underbody protection, Alternator Voltage Booster, Tiger Z winch, Lightforce DL, Air Horns, Tanami Drawers, Drop down fridge slide, Outback cargo barriers, Rotronics dual Battery system, Polaris GPS, HF/UHF/VHF, Radio speaker combiner, Long ranger water tank, Diff breathers, Inverter, Snorkel and others

                        Comment


                        • #13
                          Re: Door locking by them self

                          Thanks LeighW. Where is this ecu located?

                          Comment


                          • #14
                            Re: Door locking by them self

                            There are 3 plugs associated with the body ECU, B7, B8 & B9

                            I'm not to sure where they are, the wiring diagram shows them located on to the left side of the drivers fuse panel

                            From memory though I think they are actually behind the fuse box and slightly above it.

                            Maybe someone with more recent experience under the dash can help.

                            Either way you really need a service manual disk if your going to start poking round under there.

                            Sorry can't help more

                            Cheers

                            LeighW
                            HKB Electronics, manufacturer of the Alternator Voltage Booster, Silver 2008 D4D,Lifted,Underbody protection, Alternator Voltage Booster, Tiger Z winch, Lightforce DL, Air Horns, Tanami Drawers, Drop down fridge slide, Outback cargo barriers, Rotronics dual Battery system, Polaris GPS, HF/UHF/VHF, Radio speaker combiner, Long ranger water tank, Diff breathers, Inverter, Snorkel and others

                            Comment

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