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Discussion Starter · #1 · (Edited by Moderator)
O-K. so here goes.
My friend purchased a 2008 GMC Acadia from the auction. Looks like it has plenty of potential, but it was missing some rather important parts. I assume someone had previously attempted to steal the vehicle because the ignition cylinder, ignition cylinder casing (housing) and transponder module were missing. I did a little research and got a PasskeyIII+ cylinder, casing, and transponder WITH the key off a different vehicle from a local junkyard.

Thing is the wiring/wiring colors differed slightly from that of the Acadia. I have a TOOOOOOOON of research and can’t quite figure it out. The acadia had 5 wires going to ignition switch, and 4 wires going to transponder. The junkyard parts vehicle (2005 Cadillac CTS) had 6 wires going to ignition switch, and 4 going to transponder.

Like I said I have done soooooo much research, looked at FAAAAR too many diagrams, and im jus 100% about the way I have the IGNITION SWITCH wired up. When i turn the "new" ignition key, everything comes on just like it should, but it still says "theft attempted" on the DIC, just like it did when he first brought it to me. It wont crank (duh), and I CANNOT for the life of me get the security light go off, regardless of how long i let it sit in the "run" position. Meaning i can’t perform the relearn because I can’t get the security light to go out.
Any help would be GREATLY appreciated.

Mike
 

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Interchanging parts from one vehicle platform to another doesn't seem like a very good idea. Might be best to find the replacement ignition parts from another Lambda platform vehicle (Acadia, Outlook, Enclave, etc.) and put them in your friend's vehicle.
 

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Interchanging parts from one vehicle platform to another doesn't seem like a very good idea. Might be best to find the replacement ignition parts from another Lambda platform vehicle (Acadia, Outlook, Enclave, etc.) and put them in your friend's vehicle.
+1. Having the correct ignition parts would certainly seem to make sense. There is also the possibility that there is way more wrong with this auction gem than just a missing ignition cylinder.
 

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I could be wrong about this so more research may be necessary as I'm speaking from experience with a different vehicle brand and system altogether. Whe the vehicle senses a theft attempt, the computer performs a lockdown that requires a factory reset. There are exceedingly few auto programmers out there capable of accessing the system core at that level. All your work might be correct. You just lack proper clearance so to speak.
 
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