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Doesn't anyone here know the function of the door tailgate switch?? I came across this article on another forum which describes exactly what I am encountering. Please can someone kindly confirm this is the operation of the tailgate switch and keyfob? Tail Gate Wont Open From Key Fob or Drivers Door - Rennlist - Porsche Discussion Forums RENNLIST.COM Cayenne 955-957 2003-2010 - Tail Gate Wont Open From Key Fob or Drivers Door - Morning All, I have just purchased a...
Hi there. Before I go and get the scan done and spend more time troubleshooting, please can someone kindly confirm the operation of the tailgate switch in the drivers door. I read on a touareg forum that the function of the switch is as follows: "On mine (an '04) that switch only allows you to open the hatch after you have locked the car. ie, flip the switch, get out of the car and lock it, go to the rear and open the hatch using the switch above the license plate, retrieve your packages, close the hatch and the car re lockets itself. The feature times out after about a minute. In other words, the switch allows the hatch to open for a period of time after the car is locked. It does not open the hatch directly." Is this the correct function of the switch when working? If so, I have been operating it incorrectly.....
@JFP in PA, I understand thanks. Are there any other troubleshooting guides online that I could take a look at ? My troubleshooting logic is this: There is clearly a connection between the drivers door control unit and the rear part of the car given that I can open the fuel cap. The control unit clearly has access to the CAN bus in order for this part to function. The tailgate itself and all the motors are fine given that I can open all rear doors fine with the buttons on the rear. The tailgate switch is also working fine. My only other thought was that there could be a broken wire somewhere....I read a few times that wires occassionally get torn between the door rubber boot and the body. I have yet to take the rubber boot off to inspect further. Could this be an issue?
@JFP in PA, ok then are there any further troubleshooting techniques I could do in absence of a PIWIS or reader? I read the voltage at the tailgate switch pins in the drivers door card and they check out ok but I have 4 wires and the diagrams I have seen only show 2...slightly confused by this
Hi @JFP in PA, if I were to simply replace the driver door control unit, could this be done without any reprogramming, for example, is it a simple plug and play swap ? I could source one quite easily from ebay.......are these prone to going bad?
Hi @JFP in PA and @Loren, to be honest I am not sure I will get hold of such a scanning device anytime soon given the lockdown. In absence of this, can I get an idea of what sorts of issues could cause the faults I am observing. Could this be a driver door control unit issue for example?
Hi @Loren, forgive me but what type of things could such a scan pick up? I am of the opinion (rightly or wrongly) that this is a hardware issue like a broken wire or ground issue, what do you think?
Hi @Loren, no not as yet. I assumed this was a simple wiring/grounding issue given the following conditions are true: 1) the rear tailgate switch appears to be working fine 2) the fuel cap release switch from the drivers door is working fine which is also routed into the drivers control unit 3) there is voltage on the pins foing into the tailgate release switch 4) the switch itself is ok Right now, I have 3 unresolved issues: 1) starter motor is sluggish and never starts on first turn. Always takes at least 2 turns to fire up 2) rear tailgate release button on the drivers door and remote keyfob are not working (although with a long keypress on the keyfob, the rear tailgate glass panel does release). 3) the alarm doesn't sound, only the hazard lights illuminate Would a PIWIS or Durametric scan assist with these issues? Please note that I managed to clear up 1 issue with some cleaning of the ground points which was the original issue I had with the central locking not locking the tailgate, this now appears to work correctly.
Thank you @Rick150. Is there a diagram similar to the one I posted above that shows the "tailgate switch" and the "tank cover unlocking switch" which routes into the "driver door control unit". I am only interested in this now as those controls are on the drivers door and that is where the problem is
Hi @Rick150, no need to check the fuse as the tailgate opens and closes perfectly when I use the handle at the rear. Please can you kindly send me all the wiring diagrams for the interior lights circuits as that is where the switch for the tailgate release is located. I have this diagram but it makes no sense to me as both the fuel flap and tailgate lid switches are connected to the same wires. Can you explain it at all as I am baffled by it. Also I have 4 wires going into my tailgate switch, not 2. The other 2 are VIO/WHI and Brown which are not shown here....this is a complete mystery to me
Hi @Rick150, hope you are keeping well during these times. Can you please dig out thr wiring diagram for the interior tailgate release button as I think I am getting close to resolving this issue but need to identify where this button routes. In the past you send me some diagrams but nothing with the interior tailgate release button so far. Just out of interest, I read somewhere that this button is disabled if the cayenne thinks it has a towbar fitted. Question is how do I disable a towbar if the cayenne thinks it is installed? Can't see anything visually near the rear bumper but I am no expert on the settings yet. Thank you
Thank you @Rick150. What else is connected to MB23 please?
Hi @Rick150 and @JFP in PA. Please can one of you kindly point out where MB23 is located? I see from the diagrams that it is the left side of the dash but what I don't quite know is whether it is buried under the footwell carpet or whether it is actually somewhere to the left of the centre console? The reason I think it is important to trace is because it is linked indirectly to the rear comfort systems module via the signal horn and this is one connection I haven't addressed. On another note, I tried cleaning the joints under the wiper arm cowls but this has not has the desired effect. I have yet to test a volt drop over the cables so that will be my next option. Finally, please can you kindly advise where the rear comfort systems module is physically located?
Thank you both. @Rick150, I will be cleaning them tomorrow because I simply couldn't get in the small opening with my drill attachment. Do you have any images that show what connects to GP11, 12, 13 and 14 in terms of wiring diagrams? @JFP in PA, good idea. Which wires should I test? There are an awful lot of them. Also do you know where the negative ground strap to the starter motor is physically routed inside the engine bay so I can feel for any heat? Thanks both, this is a lengthy process but hopefully will pay off soon
Sorry for the additional clarification but do you mean the connections near the battery (i.e. under the seat area) or under the bonnet please ? slightly confused :S Will try to clear the warnings but have no diagnostic reader, will try to get hold of one and see what happens..... Anyway, today I cleaned up MB42, MB43, MB20 and MB21. Nothing appeared to change from before so then I decided to pop the hood and looked at GP11, GP12 and GP14 and I must say that they looked visually awful with white surface corrosion to the terminals as they are directly under the windshield wiper cowl (not really sensible from a design point of view). I have yet to clear these terminals up and try again but in the meantime, please can you kindly let me know what is connected to these points? Also, I tried looking for MB1 and MB5 but couldn't locate them at all - even after removing the headlight. Any ideas where I should be looking for these points? I think I have found a smoking gun 🙂