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2001 Deville won't start


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I changed the crankshaft position sensors on my Deville. I

disconnected the battery and left it disconnected for an hour thinking

it would erase any stored codes and reset the system.

Now, when you turn the key to run the dash lights come on and go out

but the security light stays on. If you turn the key to start, all the

dash lights go out and there is no cranking.

Also, the key fob will lock and unlock the doors but will not open the


I scanned it for codes and get the following:

IPC 1000

PDM 1000

PCM 1634

Any suggestions on what I should do next?

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B1000 ECU Malfunction

U1000 Class 2 Communication Malfunction

P1634 Ignition 1 Switch Circuit

Something is not plugged in. It's also possible that you might need to clean the battery cables.

-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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