AndrewDH Posted February 7, 2016 Report Share Posted February 7, 2016 Hi everyone, in the process of converting my 1.0litre to a 1.6 Gti engine out of a polo. Theres a fault code with the immobiliser coming up and the car starts up for a second then cuts out. VCDS says it's fault code 17978. Immobiliser in the key has been swapped and control unit and im using the polo dials so it's leaving me think there's a power fault with the ecu. Does anybody have a diagram which shows which ecu pins need 12 volts going into them? I have one for my lupo ecu from auto data but there's none for the gti polo. Any help would be much appreciated lads! Quote Link to comment Share on other sites More sharing options...
Pete Posted February 8, 2016 Report Share Posted February 8, 2016 So you've got the ecu from the gti, the immobiliser from the gti and the immobiliser/convenience unit from the gti? Quote Link to comment Share on other sites More sharing options...
AndrewDH Posted February 8, 2016 Author Report Share Posted February 8, 2016 (edited) 1 hour ago, Pete said: So you've got the ecu from the gti, the immobiliser from the gti and the immobiliser/convenience unit from the gti? Indeed Pete, looked up the vcds code and the only other thing they suggest is a fault with the ecu power. Which is why it would be great to know which pins are meant to have 12volts going into the polo ecu so I could double check yenno? Edited February 8, 2016 by AndrewDH Quote Link to comment Share on other sites More sharing options...
Rich Posted February 8, 2016 Report Share Posted February 8, 2016 What about the black box which connects to the key reader ? Quote Link to comment Share on other sites More sharing options...
Pete Posted February 9, 2016 Report Share Posted February 9, 2016 That's the convenience module Quote Link to comment Share on other sites More sharing options...
Rich Posted February 10, 2016 Report Share Posted February 10, 2016 no, the convenience module has nothing to do with this. There's a black box with two plugs, one leads to the key reader around the ignition. Which one is in the car? Quote Link to comment Share on other sites More sharing options...
Pete Posted February 11, 2016 Report Share Posted February 11, 2016 That is the convenience module. Quote Link to comment Share on other sites More sharing options...
lupogtiboy Posted February 11, 2016 Report Share Posted February 11, 2016 I think he is referring to the immobiliser ecu on the steering column, not the (in)convenience ecu! Quote Link to comment Share on other sites More sharing options...
Skezza Posted February 11, 2016 Report Share Posted February 11, 2016 I wonder if it's immo2, you could blag it using a cheat device. Quote Link to comment Share on other sites More sharing options...
Pete Posted February 11, 2016 Report Share Posted February 11, 2016 My photobucket is playing up otherwise I'd show you what he means. Quote Link to comment Share on other sites More sharing options...
Pete Posted February 11, 2016 Report Share Posted February 11, 2016 The thing rich is on about is the convenience module, it's the only one there is. Its lead follows up the steering column and around the ignition barrel but the box itself sits behind the fuse board. Quote Link to comment Share on other sites More sharing options...
Mobieus_uk Posted February 16, 2016 Report Share Posted February 16, 2016 i wondered what the little black box was that was bolted to the top of the fuses, did a bit of a search and these units are coded to the cars so if you ecu has been changed it will need coding to the new ecu Quote Link to comment Share on other sites More sharing options...
Pete Posted February 16, 2016 Report Share Posted February 16, 2016 This is not the case. Quote Link to comment Share on other sites More sharing options...
Pete Posted February 16, 2016 Report Share Posted February 16, 2016 I don't wanna make you look silly obviously but I just know from first hand experience that the vehicle's main ecu for engine/body electrics and the black box you are referring to arent id networked. The pairing is solely between the transponder in the keyfob and the black box aka- the convenience module. Quote Link to comment Share on other sites More sharing options...
Mobieus_uk Posted February 16, 2016 Report Share Posted February 16, 2016 no worries, wasn't my info it was just something that came up on a search Quote Link to comment Share on other sites More sharing options...
Pete Posted February 16, 2016 Report Share Posted February 16, 2016 Tbf if I hadn't come across it myself I would've agreed with you as it seems to make sense to drive authorise the 3 together! Quote Link to comment Share on other sites More sharing options...
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