Question about 1998 GMC Savana

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Passlock needed to replace ecm-purchased from auto recycler. How do you relearn security system?

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BCM controls your passlock system. All that is required is leaving your key in the igntion with it on for around 10-15minutes. Then attempt to start. The passlock system is self learning. Let me know if this works, if not we can trouble shoot from there. Thank you for using

Posted on Oct 05, 2008

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Wont start passlock not on got jump it starts then wont start got another jump wont start tried passlock relearn lites gagues work got jump it starts it wont start again wit jump took battery in itsok

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2004 Chevy impala won't start sometimes

Is the "Security" light coming on?. If so, there is a problem with the Passlock key antitheft system. It is common for the ignition cylinder key detection contacts to go bad.

Replacing the key cylinder fixes the problem. The new cylinder has to be "relearned". See the internet and search for "2004 Chevrolet passlock system relearn procedure".

Sep 26, 2014 | 2004 Chevrolet Impala

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How to reset security ignition on a 1999 chevy silverado?

There is a lot of info on this site that you can read up on.

Sep 07, 2014 | 1999 Chevrolet Silverado 1500

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Instructions replacing a brain in a 98 chevy blazer

I would find the problem first,changing the ECM is not a good idea.
will need on board programming to relearn crank position and passlock relearn. at least. And the crank relearn is a dealership(unless you have a really hi-end repair shop around) Still expensive.
ECM's rarely fail,I would suspect something else first,like mass air flow or cam sensor.No codes? next time it won't start you need to check for spark at the plugs and at least find out if it's spark or fuel that it lacks.

Jan 05, 2014 | Cars & Trucks

1 Answer

Alarm factory reset

If you are referring to the Passlock immobilizer, here is the relearn process.


Time required, approximately 10 minutes:

1. Insure that the battery is fully charged.
2. Use the scan tool in order to clear the DTCs.
3. Turn the ignition switch from the OFF position to the CRANK position attempting to start the vehicle. The vehicle will start and then stall.
4. Leave the ignition switch in the ON position while observing the security indicator.
5. When the security indicator turns off, which can take up to 10 minutes, turn the ignition switch off. Wait 10 seconds.
6. The BCM and the PCM will learn the new code on the next start attempt.

Sep 13, 2013 | 2000 Cadillac Eldorado

2 Answers

2002 Saturn L200. Dealer told me I needed to replace the PCM and the passlock module. $800.00. Is there a way to bypass the passlock B.S. Please help car is not reliable. Have children.

no the power control module runs the whole car and the pass lock you maybe can do without it controls the security systems but the pcm is the brain of the car

Sep 15, 2010 | 2002 Saturn L-Series

2 Answers

Saturn L200 Passlock Problem

I have a very untechnical solution to this problem and I can't for the life of me remember where I heard it but it sure does work. Turn the igniton to ON so that the dash lights up. Eventually the others lights go out and the flashing "Securty" light stays. Keep the driver side door slightly ajar and sit and wait for that Security light to stop blink, usually 5-10 minutes. Once it stops blinking you can start your car. I can't promise that you won't have the starting problem again, but it will happen with decreasing frequency. Ultimately you need to have the passlock issue handled at a dealership. I say DEALERSHIP because it's a manufacturer flaw and they should be made aware of this issue everytime. They're also best equipped to handle it.

Jul 28, 2010 | 2002 Saturn L-Series

1 Answer

I have 2001 saturn sl2 i changed my ignition luck


  • Due to component variability, the vehicle theft deterrent (VTD) system must have the learn procedure performed regardless, if the vehicle starts on the first ignition cycle after a VTD repair.
  • All codes in the theft deterrent module must be cleared for a relearn.
  • The body control module (BCM) must be programmed with the proper RPO configurations before performing learn procedures. Refer to BCM Programming/RPO Configuration in Body Control System.
  • If replacing the BCM with a GM Service Parts Operations (SPO) replacement part , the module will learn Passlock(TM) sensor data code immediately. The existing engine control module (ECM) however, must learn the new fuel continue password when the BCM is replaced.
  • If replacing a ECM with a SPO replacement part, after programming, these modules will learn the incoming fuel continue password immediately upon receipt of a password message. Once a password message is received, and a password is learned, a learn procedure must be performed to change this password again. An ECM which has been previously installed in another vehicle will have learned the other vehicle's starter enable password and will require a learn procedure after programming to learn the current vehicle's password.

Use these procedures after replacing:
  • Passlock(TM) Sensor
  • BCM
  • ECM
10 Minute Learn Procedure

  • Tech 2
  • Techline terminal with current Service Programming System (SPS) software
  1. Connect the Tech 2 to the vehicle.
  2. Select "Request Information" under "Service Programming".
  3. Disconnect the Tech 2 from the vehicle and connect it to a Techline terminal.
  4. On the Techline terminal, select "Theft Module Re-Learn" under "Service Programming".
  5. Disconnect the Tech 2 from the Techline terminal and connect it to the vehicle.
  6. Turn ON the ignition, with the engine OFF.
  7. Select "VTD Re-Learn" under "Service Programming".
  8. Attempt to start the engine, then release the key to ON. The vehicle will not start.
  9. Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF. The vehicle is now ready to relearn the Passlock(TM) Sensor Data Code and/or password on the next ignition switch transition from OFF to CRANK.
  10. Turn OFF the ignition, and wait 5 seconds .
  11. Start the engine. The vehicle has now learned the password.
  12. With the Tech 2 scan tool, clear any DTCs. 30 Minute Learn Procedure
  1. Turn ON the ignition, with the engine OFF.
  2. Attempt to start the engine, then release the key to ON. The vehicle will not start.
  3. Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.
  4. Turn OFF the ignition, and wait 5 seconds .
  5. Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes . The vehicle is now ready to relearn the Passlock(TM) Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK.
  6. Start the engine. The vehicle has now learned the Passlock(TM) Sensor Data Code and/or password. IMPORTANT: The vehicle learns the Passlock(TM) Sensor Data Code and/or password on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.
  7. With a scan tool, clear any DTCs if needed. History DTCs will self clear after 100 ignition cycles.
Good luck and hope this helps, You are most likely doing the relearn right. But you may still need the Tech 2 scanner to reprogram the new cylinder lock.

Nov 21, 2009 | Saturn SL2 Cars & Trucks

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