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Discussion Starter #1
What does it mean if their is a little pad lock symbol on my dashboard?
This came on out of no where and now my car won't start. Please help.
 

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Doesn't usually come out of nowhere. Dead batteries sometime will trigger this or inserting wrong car key by accident. Try waiting 10 minutes, if that don't work try the 30 minute reset.

---------- Post added at 08:54 PM ---------- Previous post was at 08:43 PM ----------

Immobilizer System Component Programming (Except Canada)
10-Minute Immobilizer Relearn
This 10-minute relearn procedure will relearn the start enable password between the theft deterrent module (TDM) and the engine control module (ECM).

Connect a scan tool to the vehicle.
Turn ON the ignition, with the engine OFF.
Ensure that all power consuming devices are turned OFF on the vehicle.
With a scan tool, select Request Info. under Service Programming System and follow the scan tool on-screen instructions.
Disconnect the scan tool from the vehicle and connect the scan tool to a Techline Terminal with the current Service Programming System (SPS) software.
On the Techline Terminal, select Service Programming System and follow the Techline Terminal on-screen instructions. Ensure the correct programming selection is chose based on component being replaced or programmed. For this procedure, go to the V.T.D. Vehicle Theft Deterrent Learn menu and choose the Vehicle Theft Deterrent Learn for Powertrain System selection.
Disconnect the scan tool from the Techline Terminal and reconnect the scan tool to the vehicle.
With a master vehicle key, turn ON the ignition with the engine OFF.
With a scan tool, select Program ECU under Service Programming System.
At this point the scan tool must remain connected for the duration of the 10-minute relearn procedure.
Important:

• The scan tool may initially display 12 Minutes. The first 2 minutes allow the scan tool to initialize the appropriate control module. The remaining 10 minutes is the relearn timer.

• On some vehicles the security indicator may be illuminated for the duration of the 10-minute relearn procedure.


Observe the scan tool, after approximately 10 minutes the scan tool will display "Programming Successful, Turn OFF Ignition". The vehicle is now ready to relearn the key information and/or the passwords on the next ignition switch transition from OFF to CRANK.
Turn OFF the ignition and wait 2 minutes.
With a master vehicle key, turn the ignition to the RUN position for 15 seconds, then start the vehicle. The TDM and ECM have now relearned the pre-release password and the challenge/response data.
With a scan tool, clear any DTCs.
30-Minute Immobilizer Relearn

---------- Post added at 09:37 PM ---------- Previous post was at 08:54 PM ----------

Security Indicator Operation
The theft deterrent module (TDM) can command the body control module (BCM) to illuminate the security indicator only when the ignition key is in the ON position. A flashing indicator indicates unauthorized operation. Under the following conditions the security indicator may be commanded to illuminate or flash:

Security Indicator Stays Illuminated and Engine Starts
If the TDM was unable to measure the ignition key transponder value or the engine control module (ECM) lost communication with the vehicle theft deterrent (VTD) system while the engine was last running, the indicator will remain illuminated during subsequent ignition cycles. This is to remind the driver that the VTD system will not be functioning until the problem is corrected.

Security Indicator Illuminates when Engine is Running
If the TDM is unable to measure the ignition key transponder value or the ECM loses communication with the TDM while the engine is running, the security indicator will be illuminated.

Security Indicator Illuminated and Engine Does Not Start
If the TDM was unable to measure the ignition key transponder value, the ECM has detected a problem with the VTD system, or the VTD system is in Learn Mode, the security indicator will be illuminated.

Security Indicator Flashes and Engine Does Not Start
The TDM has measured an incorrect transponder value, the calculation to the challenge is incorrect or the ECM has lost communication with the theft deterrent control module. The VTD system considers this a tamper condition. The security indicator will flash.
 

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If you have the "Owner's Manual" for your vehicle...read-up on the security system. GM (and other) vehicles started installing security/anti-theft modules many years ago as an additional level of vehicle protection. Some are problematic and sensitive and others work well. If certain things interrupt the system, it will trigger...can be anything from bad transponder in key, to worn parts. Coby7 (above) provided the means to reset your system which is a good procedure to learn/follow. Hope yours is an easy fix...
 

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Discussion Starter #4
I'm gonna start with a new transponder key. I had a key made but wasn't a chip key. i tried to start the car and that's probably where my problem started. Thank you!
 

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^^^And..., as Paul Harvey used to say...the rest of the story^^^

Definitely going to ping your security, if wrong key's used. That's why they have the chip...just had one made @ Wal Mart = $35 fix, but follow the steps to pair it to your system.
 
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