Ignition cylinder will not go back all the way to release key

Johnny Owner/Technician Ontario Posted   Latest  
Resolved
Electrical
Network Communications
2004 Cadillac CTS 3.6L 5-spd
U1000 — Manufacturer Controlled DTC
Gm

Hi, I got this Cadillac in with complaints that key wont come out of the ignition and no fuel and temp gauge working. I scanned the car and I have code U1000 stored in many modules. I checked all my fuses and as far as I know all modules are communicating. I noticed the shifter position lights on the shifter column does not work as well. I tested the two wires for my Ignition lock cylinder actuator and I have power but no ground going from the dash integration module (BCM). I believe my problem is the communication bus. If it is, I need some help diagnosing it. 

Thanks, 

Johnny

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Interesting
Allan Owner
Virginia
Allan Default
 

Every one of those I’ve ever done that the key will not return needed a PCM. And I’ve seen a bunch. May be something else but so far that’s always been it

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Reid Owner/Technician
New Jersey
Reid Default
 

I will second that. I have also done a bunch of these and haven’t seen one yet that wasn’t a a faulty engine control module.

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Albin Diagnostician
Washington
Albin Default
 

Is the lock cylinder control solenoid working as designed? Have you tested the power at terminal B9- tan wire at the dash integration module?

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Johnny Owner/Technician
Ontario
Johnny Default
 

Hi Albin, thanks for the reply. Yes that is the wire that I mentioned has no ground going to the solenoid. The power wire is red/wht from the fuse and tan wire from DIM module is the ground signal which I'm missing

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Scott Owner
California
Scott Default
 

Hi Johnny, Is the ECM showing up on Class 2 as well as the GMLAN? The faults with these ECM's with the problems you're experiencing is that the ECM is not active on the Class 2 dataline. You'll see data, but that is on the GMLAN side of things which is ECM & TCM. The modules that need info from the ECM, which if I recall are the DIM & RIM get that from Class 2, and the ECM is not…

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Gilberto Curriculum Developer
California
Gilberto Default
 

I agree with the others. The PCM does send the info out to release the key and the shifter. The class 2 usually goes out inside the PCM. You can remove the key if you use the bi-directional control.

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Anthony Technical Support Specialist
Pennsylvania
Anthony Default
 

Hi Johnny: Assuming that it is the PCM, I'll offer you some advice. This should be a Siemens' module in your Opel. There will be no recovery if there is an issue. Verify your auxiliary power supply voltage before and during programming. Replacement modules being good are a coin flip. Before bothering to even attempt programming it, go into Data or DTCs in your Tech 2 and verify that you can…

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Johnny Owner/Technician
Ontario
Johnny Default
 

Hey Anthony, Are we talking about a used or a new GM module here? If a new one all I got to say is WOW. And one thing I forgot to mention here was that this car came from another shop for me to install and program a used PCM because he doesn't program modules and how he diagnosed the car was he google search the problem and most people where saying the PCM. So after I programmed the used PCM…

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Anthony Technical Support Specialist
Pennsylvania
Anthony Default
 

Hi Johnny: I was referring to "remanufactured modules". There are no new modules. I guess I should qualify that. If you find a "new module", buy a lottery ticket. If the expectations were for you to program the module, then you are done. You've delivered what you were contracted to do. HTH, Guido

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Todd Mobile Technician
Alberta
Todd Default
 

One time, of the many of these I have done for this exact same problem, I programmed the "new" ECM and the same issue remained. Key wouldnt come out, etc. Tell the customer to call the dealer and ask if it was new or reman. While he was talking to the parts guy on the phone, who was busy assuring him it was new, I was standing there peeling off a Delco sticker to reveal another underneath…

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Richard Technician
New York
Richard Default
 

I have seen this before. The issue was the PCM. The U code is telling you the PCM is not communicating with the others.

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Robert Mobile Technician
Michigan
Robert Default
 

I would have to concur with Anthony's statement. These vintage of vehicle's are a coin toss to say the least. When I receive a call for one of these the price goes up and you have you hope all goes as planned. Doing the immobilizer can be a pain as well. I normally tell the shops to have two extra on hand before I get there. In the last two years I haven't seen this many of vehicle lately due to…

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Caleb Diagnostician
Indiana
Caleb Default
 

Hey Johnny. Everyone is correct that the PCMs are notorious for producing this symptom. To test I would bidirectionally control the key release solenoid from the Dash Intergration Module. If that works then the next step is go to the ECM. Cut the class 2 data line at the ECM. Use a scope to look for 0-7 volt square wave out of the ECM. If its good check for signal getting to the ECM. More than…

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Mike Mobile Technician
South Carolina
Mike Default
 

I just did one of these last week and our dealer said the PCMs are discontinued and they can't even get remans now. Our customer was able to find a reman from a local parts house. I haven't had too many issues programming these units but I've probably been lucky.

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Johnny Owner/Technician
Ontario
Johnny Default
 

Changed ECM problem solved. Thank you everyone. Johnny

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Rudy Technician
California
Rudy Default
 

PCM and Ive had a few issues trying to get new PCMs to program.

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Johnny Owner/Technician
Ontario
Johnny Resolution
 

Changed ECM problem solved. Thank you everyone. Johnny

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