Quantcast




All times are UTC - 6 hours [ DST ]




Ask A Question Reply   
Author Message
 

contributions: 2
I have a 2004 Chevrolet Monte Carlo. On the message screen it says service vehicle soon "security" but the car starts and runs fine never dies and never fails to start. It stays on when the car is running also. What does this security light mean? I have changed the ignition switch and key cylinder with no luck in solving the issue..Any ideas?


Share on FacebookShare on DiggShare on DeliciousShare on TechnoratiShare on TumblrShare on Google+
   
Reply with quote  
* Search   
 
User avatar

contributions: 1944
Images: 37
Location: Oregon
the "security" comes on when your VTD (vehicle theft deterrent) doesn't see a signal or an incorrect signal from the passlock sensor. If it sees a wrong signal when you go to start it will not let the engine stay running. (the anti theft part) If if loses the communication while the engine is running it shows the "security" message but since it was already started with the correct signal, it allows the car to run and start like a default mode. What ever you do, DO NOT CLEAR CODES! Clearing the codes now will erase the memory that you lost the signal after you started your car and then lost passlock signal and your car will no longer start. It will have a clean memory and now see that there is no signal or a wrong signal and lock your out of starting the engine.

you will need to have your passlock sensor checked out to see if the sensor or the wiring may be damaged. A Tech2 scanner is the best tool to look at the system. Some other scanners may be able to show the system but the Tech2, I have found, is the best tool for the job.

So you can just keep driving it the way it is or have the passlock system diagnosed and fixed. It is not the ignition switch (electronic switch). It's the three wires (black-ground, white-B+ and the yellow-data) the go into the ignition lock cylinder.


   
Reply with quote  
 

contributions: 2
OK great info. I did replace the pass-lock sensor with the 3 wires with the key cylinder. do you know what the voltage or values are at each one of the 3 points in the pass locks sensor wires? I can check it with my fluke meter.


   
Reply with quote  
 
User avatar

contributions: 1944
Images: 37
Location: Oregon
the voltage that the passlock is concerned about is the return voltage. you should have voltage, ground and return. the return is decided by your key and lock cylinder. That voltage will vary according to the vehicle. that's how the computer will see if it is the correct key or not.

If you do the relearn for the passlock you should be good, (if everything else is ok)


   
Reply with quote  
Ask A Question Reply   


   Similar Topics   Author   Replies   Views   Most Recent 
New Articles View the first 2005 monte carlo help

in Chevy Cars

monteman

1

1256

Mon Dec 29, 2014 4:34 pm

carriedi View the latest

New Articles View the first Monte Carlo knocking in the dash

in Chevy Cars

dunnpaul

2

1411

Mon Aug 08, 2016 5:06 pm

Guest View the latest

New Articles View the first Chevy Monte Carlo fuel pump stops

in Chevy Cars

joeyp5639

1

1140

Tue Oct 14, 2014 7:31 pm

carriedi View the latest

New Articles View the first 1999 monte carlo engine continues to run after ignition off

in Chevy Cars

redslippers02

1

1059

Sat Aug 29, 2015 11:15 pm

carriedi View the latest

New Articles View the first 2002 Chevrolet Venture WB Edition No video on DVD screen

in Chevy Venture Van

chevymom2

2

515

Tue Sep 23, 2014 7:16 pm

chevymom2 View the latest

New Articles View the first flaahing check engine light 2004 impala?

in Chevy Cars

madgam

1

1461

Mon May 19, 2014 4:11 am

carriedi View the latest

New Articles View the first 2004 Chevy Classic 2.2 throttle issue?

in Chevy Cars

stargate

3

1411

Mon Jun 01, 2015 10:22 am

carriedi View the latest


All times are UTC - 6 hours [ DST ]



Search for:
Jump to:  
Contact Us