bigguy1 Posted October 10, 2012 Report Share Posted October 10, 2012 i have a 96 sedan deville 4.6 northstar 326545 miles never have had a lick or trouble well a week ago the alternator went out and left my wife stranded i went after work jump the car drove it home and replaced the alternator and charged the battery and had it tested all was well till i went to go start the the car it wont start and i get a message theft system problem car may not restart i have spark car cranks over have fuel to the fuel rail but no injector pulse i have checked fuses pos and neg bat cables even replaced the bcm can anyone shed some light on this situation please also the codes i pulled are as follows pc0325 knock sensor fault pc0603 cm long term reset pc1631 theft deterent system ip2750 pass key data com failure ip2710 pass key open or shorted pz1552 keep alive memory error pz1558 bcm eprom checksum error rf 2560 rke message validation error any info is greatly appreicated Link to comment Share on other sites More sharing options...
KHE Posted October 10, 2012 Report Share Posted October 10, 2012 Sounds like there is an issue with the PASS key system that is preventing the car from starting based on your codes. There is a ton of information in the archives on repairing the system or defeating it. It is a coincidence that the issue occured after replacing the alternator. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
bigguy1 Posted October 11, 2012 Author Report Share Posted October 11, 2012 the only thing i am finding is how to bypass the ignition with the resistors i have already done this i wish there was a way to completely bypass this issue Link to comment Share on other sites More sharing options...
KHE Posted October 11, 2012 Report Share Posted October 11, 2012 The fact there is a "pass key shorted or open" code tells me there is something wrong with the bypass resistor that was installed. Check to make sure the leads are not broken or shorted together. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
bigguy1 Posted October 12, 2012 Author Report Share Posted October 12, 2012 the passkey resistors are spot on no breaks in the conection if there was it would not crank the ohm on my key is .523 and the resistor i built is .520 i belive the pcm is fried Link to comment Share on other sites More sharing options...
KHE Posted October 12, 2012 Report Share Posted October 12, 2012 the passkey resistors are spot on no breaks in the conection if there was it would not crank the ohm on my key is .523 and the resistor i built is .520 i belive the pcm is fried The PCM is a very durable unit. I would not automatically suspect the PCM.... Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
bigguy1 Posted October 12, 2012 Author Report Share Posted October 12, 2012 its not automattically its 8 days of trouble shooting and google as well as a 22yr mech helping me Link to comment Share on other sites More sharing options...
bigguy1 Posted October 12, 2012 Author Report Share Posted October 12, 2012 we have tried anything and everything we know and have found on the net shy of replacing the ecm Link to comment Share on other sites More sharing options...
KHE Posted October 12, 2012 Report Share Posted October 12, 2012 we have tried anything and everything we know and have found on the net shy of replacing the ecm Then replace the PCM - you have your mind made up on that. Let me ask you this: Is your mechanic with 22 years experience willing to take the risk if the PCM replacement doesn't solve the problem? In other words, will he pick up the cost of the PCM? Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
bigguy1 Posted October 12, 2012 Author Report Share Posted October 12, 2012 if it was in his shop and i was a paying customer and not a buddy yea he would and i only paid 1200 for the car 3 yrs ago im not paying 1200 to get the ecm and have it flashed i am looking for ideas maybe something we have not tried yet befor i scrap it or part it out Link to comment Share on other sites More sharing options...
rockfangd Posted October 12, 2012 Report Share Posted October 12, 2012 I dont think ecm first on this. where did you install the resistor in the column under the dash? is there any broken wires under the dash. If you bypassed the ignition pellet system it is all about the resistor. I also think if the pcm was at fault you would have other issues. I love the Deville and that is excellent miles welcome to caddyinfo GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
bigguy1 Posted October 12, 2012 Author Report Share Posted October 12, 2012 thanks for the welcome and i i love my deville she has been a good reliable car untill this happened i am just at a lost right now i have checked and double checked and triple checked everything Link to comment Share on other sites More sharing options...
Texas Jim Posted October 12, 2012 Report Share Posted October 12, 2012 pc1631 theft deterent system ip2750 pass key data com failure ip2710 pass key open or shorted rf 2560 rke message validation error If I am not mistaken... any of those codes will prevent it from starting... ALL of them point to a problem with the key. Link to comment Share on other sites More sharing options...
rockfangd Posted October 12, 2012 Report Share Posted October 12, 2012 thats what I am saying. does the passkey info even go to the ecm or does it go to the bcm? GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
bigguy1 Posted October 13, 2012 Author Report Share Posted October 13, 2012 the bzm from my understanding controls alot of the theft system but the pcm has part of in it as well so if i have understood what i have read and what what i have been told it takes both of them to work i will check the wires and ohms on the key and see where that gets me tomorrow Link to comment Share on other sites More sharing options...
bigguy1 Posted October 16, 2012 Author Report Share Posted October 16, 2012 so i have checked every thing once again and the wiring is ok the resistors are ok everything i can think of is ok so i am at a loss any other ideas other than what has been stated is greatly apericated Link to comment Share on other sites More sharing options...
BodybyFisher Posted October 17, 2012 Report Share Posted October 17, 2012 I sent a PM to caddypete regarding this thread where he had an IP2750 code and a no start condition. This appears to be a class 2 network problem, see caddypetes thread here http://caddyinfo.ipbhost.com/index.php?showtopic=17579&hl=2750 Let me ask, when you jumped this car, did you even for a brief second accidently reverse the jumper cables POS to NEG? Have you tried to disconnect the battery and force a hard "reboot" of the system? I can not see a spontaineous security failure like this occurring with a dead battery. I also would not replace the PCM Do you have the 96 Factory Service Manual? I have one and it may make sense to look into the diagnostic trees for the codes you are getting. Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
bigguy1 Posted October 18, 2012 Author Report Share Posted October 18, 2012 no i did not reverse the cables and i do not have the service manual sometimes wish i did thanks for the info and ill read the thread and see Link to comment Share on other sites More sharing options...
BodybyFisher Posted October 18, 2012 Report Share Posted October 18, 2012 I sent caddypete a PM to see what the solution was to this problem Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
Göran W Posted November 28, 2012 Report Share Posted November 28, 2012 even replaced the bcm I can be dead wrong but...... Are you sure that doesn´t interfer with PASS key? If so you may have the wrong resistence after all? Link to comment Share on other sites More sharing options...
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