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Security disable

Tiny
WESLEYBUTLER
  • MEMBER
  • 2002 BUICK REGAL
  • 3.8L
  • V6
  • TURBO
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
GS model supercharged: Solid security light and solid check engine light lit for over a year with the engine running fine before scanning. I scanned all systems with Blue Driver OBD2 Diagnostic Scan Tool while the engine was running. Scan revealed confirmed codes P0102 and B2958. It also displayed historical security codes B2960, B2957 and B2961. I selected "clear all codes" and then the engine shut off. I attempted to restart the vehicle but the vehicle only clicked, no crank, no start. I attempted the GM Passlock relearn procedure but it did not work. No crank, no start and the solid security light, check engine light still remain. I scanned the system again and current security code B2958 and historical security code B2960 are the only codes that remain. Battery is fully charged. Can a scan tool really cause a vehicle not to start? How do I fix this?
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Monday, February 12th, 2018 AT 11:39 PM

12 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

The click that you hear, is it coming from the starter motor?
Make sure your battery connections are clean and tight.
Do you have a voltmeter to check the voltage at the battery?

No, not usually, the check engine light should not affect the starting when cleared.

Roy
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Tuesday, February 13th, 2018 AT 1:36 AM
Tiny
WESLEYBUTLER
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  • 10 POSTS
With the key in the "on" position, I can hear the fuel pump priming. When I turn the key forward to crank, I hear a relay in the dash click one time. Battery connections are clean and tight. I charged and load tested the battery. It is around 12.5 volts sitting and 14 volts when charging. The car literally went from running to not running right in front of my eyes and the only action I had taken before hand was running a scan tool and clearing codes.
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Tuesday, February 13th, 2018 AT 11:29 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, thanks.

Does the theft light stay on with the key on or does it go off after about ten seconds?

Roy
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Tuesday, February 13th, 2018 AT 11:33 AM
Tiny
WESLEYBUTLER
  • MEMBER
  • 10 POSTS
"No crank, no start and the solid security light, check engine light still remain." The theft light stays on solid (not blinking) with the key on.
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Tuesday, February 13th, 2018 AT 11:45 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Try the password relearn.

Turn the key to on. Let it set for ten minutes, the light should go out.
Then turn the key off and back on again and wait for ten minutes.
Turn the key off and on again and wait ten minutes until the light goes out. That is when the key learns the password and see if it will start.

Roy
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Tuesday, February 13th, 2018 AT 11:57 AM
Tiny
WESLEYBUTLER
  • MEMBER
  • 10 POSTS
"I attempted the GM Passlock relearn procedure but it did not work." This procedure is exactly what you have instructed to do. I performed the full procedure. Even though most instructions state that the security light will be blinking beforehand, mine was solid. The procedure states the light will go out after the first ten minutes. Mine is still on solid after the full thirty minute procedure.
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Tuesday, February 13th, 2018 AT 12:03 PM
Tiny
ASEMASTER6371
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Okay, then there is a fault in the security system that will not allow the key to learn the password.

Let me check on that system.

Roy
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Tuesday, February 13th, 2018 AT 12:20 PM
Tiny
ASEMASTER6371
  • MECHANIC
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There is also a thirty minute relearn procedure as well. It is posted below.

Roy

Thirty Minute Learn Procedure:
1. Turn "on" the ignition, with the engine "off".
2. Attempt to start the engine, then release the key to "on" (vehicle will not start).
3. Observe the security telltale, after approximately ten minutes the telltale will turn off.
4. Turn off the ignition, and wait five seconds.
5. Repeat steps one through four two more times for a total of three cycles/thirty minutes (the vehicle is now ready to relearn the password on the next ignition switch transition from off to crank).

Important: The vehicle learns the password on the next ignition switch transition from off to crank. You must turn the ignition off before attempting to start the vehicle.

6. Start the engine (the vehicle has now learned the password).
7. With a scan tool, clear any DTCs if needed (history DTCs will self clear after 100 ignition cycles).
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Tuesday, February 13th, 2018 AT 1:09 PM
Tiny
WESLEYBUTLER
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If you look closely that is the same procedure.
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Tuesday, February 13th, 2018 AT 4:16 PM
Tiny
ASEMASTER6371
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Yes, with the exception of turning the engine to the start position. It is different. Give it a try before we start talking more about the theft deterrent system.

Roy
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Wednesday, February 14th, 2018 AT 12:32 AM
Tiny
WESLEYBUTLER
  • MEMBER
  • 10 POSTS
SOLVED: I removed the radio/HVAC bezel and steering column top/bottom covers to gain access to the ignition cylinder. One of the small white wires on the ignition switch that sends the resistance value from the key pellet to the GM Passkey system was broken. Before fixing anything, I attempted to start the car and it started right up with wire broken and the security light lit. I soldered the wire together. Car now starts and runs fine with no Security light and no current security codes. I'm still not sure what the cause of the original no start issue was. It truly seemed like the engine dying and not restarting correlated with clearing the security codes. Obviously the wire damage was a long standing issue that needed to be corrected. Anyways, thank you for your input. It is truly appreciated.
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Monday, February 19th, 2018 AT 10:16 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Great find I though GM fixed this problem on the older cars but I guess not this thread will help many nice work ;)

Cheers, Ken
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Thursday, February 22nd, 2018 AT 12:34 PM

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