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Codes U1000, P1630, P1626, P1632

Tiny
WOODBOB690
  • MEMBER
  • 1999 CHEVROLET CAVALIER
  • 2.2L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 151,834 MILES
So I am having a problem with the theft deterrent system. I have tried to reset it with no good result. Here's the thing I swapped engine from a 3 speed to a 4 speed with the wiring harness for under the hood the system was bypassed on my computer but this one is not. How would I bypass it again when I have already bypassed it once?
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Monday, April 12th, 2021 AT 11:04 AM

28 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,644 POSTS
Hi,

I don't see how the immobilizer can be bypassed. If you let the key in the on position for approx 10 minutes, does the security light turn off, and then the vehicle will start?

Joe
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Tuesday, April 13th, 2021 AT 6:58 PM
Tiny
WOODBOB690
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I tried that security light stays on but it always has been on it doesn't turn off.
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Tuesday, April 13th, 2021 AT 7:04 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Okay. The best I'm going to be able to do is provide the wiring schematic for the entire powertrain management. Since you changed the type of transmission and the harness, I have nothing to reference here.

First, here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

If you look at the attachments, I included the wiring schematics for the powertrain management. I had to cut the pics in half to make them readable. However, I did overlap them so you can follow from one to the next.

I hope this helps. Honestly, not being there and not seeing what was changed and done makes this difficult. Plus, I have no specific reference tools for what was done.

Take care,

Joe
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Wednesday, April 14th, 2021 AT 6:43 PM
Tiny
WOODBOB690
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  • 28 POSTS
I had a 2.2, 3 speed automatic in my 1999 Cavalier I took that out and put a 2.2 4 speed automatic from a 2001 Cavalier in it had to take the wiring harness because it has a plug that plugs into the front of the engine everything is hooked up. I just can't get passed the theft deterrent. Thank you for your help it is very much appreciated.
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Wednesday, April 14th, 2021 AT 7:45 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,644 POSTS
I attached the anti-theft schematics below. Is there any reason that the key wouldn't be recognized by the passlock? Also, check to see if there is a 5v reference to the passlock cylinder via the white wire. Also, confirm continuity to ground via the black wire.

Explain what procedure you used to reset the anti-theft.

Joe
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Wednesday, April 14th, 2021 AT 8:27 PM
Tiny
WOODBOB690
  • MEMBER
  • 28 POSTS
A couple of years ago I replaced the ignition but I bypassed it by cutting the yellow wire and it ran fine. Then I changed everything I am pretty sure that the car I got the engine out of it wasn't bypassed not sure if that makes a difference. The white wire only read 2.8 volts. I have turn the key on 10 minutes then off turn back on for 10 more minutes back off then back on for 10 more minutes.
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Thursday, April 15th, 2021 AT 3:27 PM
Tiny
JACOBANDNICKOLAS
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If the new wiring harness hasn't been changed, then the passkey is likely not communicating for it to start. It sounds like you are doing the 30 minute relearn. If any codes are still present in the PCM, the relearn won't work. Make sure they are all cleared first.
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Thursday, April 15th, 2021 AT 4:55 PM
Tiny
WOODBOB690
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It didn't work. I clear the codes and the first time I turn the key off to on the check engine light comes on I'm assuming the u1000 code is popping up whatever that is.
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Saturday, April 17th, 2021 AT 2:02 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

The U1000 basically indicates the control module is not receiving signals from other modules. Take a look through the two pics I attached. Let me know if that helps you or if you have other questions.

Joe
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Saturday, April 17th, 2021 AT 6:49 PM
Tiny
WOODBOB690
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So it could be the theft system.
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Saturday, April 17th, 2021 AT 9:05 PM
Tiny
JACOBANDNICKOLAS
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Yes, it could actually, the code will be set by any module that isn't communicating with the control module. Since this is related to the anti-theft, the problem is likely related to the theft deterrent module. A signal from it isn't being received by the control module.

This is where I start to get lost because of the changes that were made and the wiring harness changes to compensate for a different transmission. Was anything changed as far as the PCM? Did you change keys, ignitions, or anything other? You mentioned you bypassed it once. What did you bypass?

Let me know.

Joe
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Saturday, April 17th, 2021 AT 10:07 PM
Tiny
WOODBOB690
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The big plug drivers side I unplugged that and plugged the other one in. And I by passed the theft system by cutting the yellow wire.
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Sunday, April 18th, 2021 AT 12:18 AM
Tiny
JACOBANDNICKOLAS
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The yellow wire is for the Magnetic Resonance Device (MRD). That is the input for it. If you have that wire cut, the pass lock is not signaling the control module which is likely the cause of the U1000. What happens if you reconnect that wire?

Joe
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Sunday, April 18th, 2021 AT 6:19 PM
Tiny
WOODBOB690
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Nothing it does the same thing.
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Sunday, April 18th, 2021 AT 7:15 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Did you change the ignition lock or anything? The 1626 indicates the body control module isn't enabling the fuel circuit (anti-theft/key not recognized) 1630 indicates the PCM is in the password learn mode, and 1632 indicates the PCM has received a fuel cut-off password from the BCM or an undecided password which could mean there is no communication.

The problem could be the switch/passkey, something different in the new harness, a faulty body control module, faulty PCM, and so on.

I have one last thing to try. Disconnect the battery. Take a zip tie and clamp the pos and neg battery cables together. Let them sit like that for about 30 minutes. This will discharge any capacitors which may be holding power. Hopefully, it will reset the BCM and change things.

Let me know.

Joe
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Sunday, April 18th, 2021 AT 7:53 PM
Tiny
WOODBOB690
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Yeah, it didn't do anything different. I think I'm going to change the BCM.
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Monday, April 19th, 2021 AT 11:15 AM
Tiny
JACOBANDNICKOLAS
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That may take care of it. Did you try the battery trick?

When you remove it, make sure to inspect connections and the ground. See the pic below for ground location.

Let me know.

Joe
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Monday, April 19th, 2021 AT 5:10 PM
Tiny
WOODBOB690
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So I found this (see attachment) but it says ABS and the plugs are different so I don't think it's it.
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Monday, April 19th, 2021 AT 5:30 PM
Tiny
JACOBANDNICKOLAS
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Hi,

No, that isn't it. It should be under the dash on the left side.

Joe
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Monday, April 19th, 2021 AT 8:41 PM
Tiny
WOODBOB690
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So every video I watch and everything I read shows me that the BCM is behind the fuse box and back a little bit. That ABS thing I showed you is where the BCM should be, so I am a little bit confused about that.
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Tuesday, April 20th, 2021 AT 7:21 AM

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