Question about Chevrolet 3500

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My 1999 Chevy Truck 3500 with 5.7 L engine. It has Passlock II. While driving the Security Light came on and stayed on. Later my starter failed so had to disconnect the battery. Now Security Light stays on steady with ignition.on./ It will crank and fire for less than 2 seconds. The Security System will not reset with the 10 minute procedure. What do you think is the problem? Should I condidder eliminating the Security System? If so, how? Thank you for your response. Fred Musial (

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Yes you can deactivate the factory alarm system and put in a after market alarm. when you disconnect your battery cable the system may have lost the code. you can have a lock smith check same for you.

Posted on Jul 23, 2009


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1 Answer

Truck cranks when cold will not stay running

I'm assuming the engine cranks over with the starter, seems to start for a second or two then dies.

Does the message centre have a flashing "SECURITY" message?

If so, you have a Passlock II problem.

To get it running you'll have to do the 10 minute relearn procedure, or if that fails the 30 minute relearn procedure. I could post both procedures if you like.

To fix it so it will never fail again you will have to:
1) bypass the sensor in the steering column, or ,
2) hardwire (solder) the 3 wires to the sensor, or ,
3) replace the sensor.
This last option rarely works due to the problem being in the connector contacts, therefore my preferred method is either option 1 or 2. (I really wish GM would fix the contact issue by using gold flashed contacts and not crummy tin plated ones which tarnish over time)

Oct 04, 2014 | 1999 Chevrolet K1500

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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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How to bypass passlock on 1999 chevy blazer

The most common repair is to replace the ignition lock cylinder due to broken wires inside the steering column. Most common problems related to the Passlock family involve the Passlock sensor. The sensor is part of the ignition lock cylinder on Passlock I and Passlock II systems. ( Where the key goes ), Good-Day!

Aug 27, 2014 | 1999 Chevrolet Blazer

1 Answer

My security light stays on & won't let my 99 gmc 6.5 diesel sierra start any solutions

Yes, the system is called Passlock, and malfunctions regularly. Go to this link for an explanation of how it works, plus some tricks and tips on how to reset it, or bypass it.

Mar 27, 2012 | 1999 GMC Sierra 3500

1 Answer

The security light came on my 2001 Chevrolet Express 3500 and stays on while driving. I don't even have a security system installed. Could this mean something else?

Yes you do have a security system. Its called passlock, and is more of an antitheft system than a security system. Actually you won't ever know you have it until someone tries to steal your vehicle or until it fails. Sounds like yours is failing. This link will help you understand the system and give you options to fix this yourself.

Jul 01, 2011 | Chevrolet Express Cars & Trucks

1 Answer

I have a 2000 chevy 3500 truck. A security light came on and started blinking. now the car wont start. what do i do

The passlock is causing a problem try this process and see if it will correct the issue.If it does not the passlock assembly and ignition tumbler may need replaced.
1) Put the key in the ignition and turn to the "ON" position. Leave it that way for 10 minutes. After 10 minutes turn the key and take it out. Repeat this process (2) more times (3 times, 30 minutes total) This should reset the PASSKEY system to recognize your key

Jan 12, 2011 | Chevrolet 3500 Cars & Trucks

2 Answers

My son has a 1999 grand am, just like the oneshown above. the car wont start because the security sys. shuts off the fuel sys. down. the manifold still has good pressure cause we just had thefuel pump...

Need a bit more information, Is the security light on, have you checked for spark and fuel pressure2.gif, just in case you did and know it is the passlock system then check this out, hopefully it will ansewer your problem, please rate your mechanics help.
have a great day. Sorry the pictures won't come up, but check out the site
GM Passlock I & II Information

Please study the following information carefully WHEN INSTALLING REMOTE START systems on a 1996 or later GM car or truck.
Introduced in 1996, GM has changed the VATS anti theft system to Pass-Lock system. This is a similar device to the VATS system, in that there is a resistor present2.gif during the start cycle. However, in the PASSLOCK system, the resistor has been placed inside the ignition switch, instead of the key. See the GM V.A.T.S page for more information.
To remotely start a car with this feature, you must bypass the PASSLOCK system. There are two methods of doing so.. The first, is to permanently bypass this system. This is the easiest method for accomplishing your task. The second way, is to temporarily bypass the PASSLOCK, by introducing relays into the system, which retain all of the features of the system, while allowing your remotes start module to bypass it automatically during a remote start cycle.
Vehicles effected
(1996 and newer): N & J body cars, such as
Pontiac Sunfire and GrandAm Passlock-1
Chevrolet2.gif Cavalier Passlock-1
Buick Skylark Passlock-1
Oldsmobile Achieva Passlock-1
1997 or newer
Chevrolet Malibu2.gif Passlock-II
Oldsmobile Cutlass Passlock-II
1998 or newer
All trucks , SUVs and Vans Passlock-II
It is important to pay special attention to the fact that there are many different ways of achieving the same goal. There are actually 2 different Passlock-II systems. On the next page, there are tests to establish which type of passlock-II your car has.
Relays shown are standard automotive 5 pin spdt relays, available from IEI.
A multi meter is required to measure the resistance values. Accuracy is important within 5%.
Once the value of the resistor is measured, a resistor of the samevalue +/-5% must be purchased (Radio Shack2.gif, for example). You can also use a Potentiometer (POT), which can be adjusted to the same value of the resistor in the ignition switch.

pslc1.gif Passlock-I bypass procedure....

1: Remove the top and bottom shrouds from the steering column.
2: Find the 3 wire ribbon cable2.gif, coming from the ignition switch, containing White, Black, Yellow (Sometimes White, Black, Black). These are THIN wires.
3: Locate the Black 6 position connector on the LEFT side of the steering column, right above the ignition switch position. There is a BLACK (Thin) wire in this connector, called "Bulb Test", which shows Ground with ignition in the Off position, OPEN in the "Run" position, and GROUND in the "Crank" position.
4: Turn the ignition switch to the "Run" position. Do not crank the car.
5: Cut the Thin Yellow wire and strip both ends.
6: Without cutting the Black wire, expose some of the copper.
7: Using the ohmmeter, measure from the Yellow wire (the end coming from the ignition switch), to the exposed Black wire and record the value. Measure more than once to assure you have the right value.
8: Acquire the same size resistor and 3 relays, and perform the connections shown in the diagram below.

pslk2.gif PASSLOCK-II bypass procedure

There are 2 types of Passlock-II systems. To determine which system you have, follow these instructions;

1: Locate two wires, which are THIN and are in the main ignition harness.. Orange/Black (or Black) and Yellow.
2: Cut the Yellow wire, and strip back some of the insulation from the Orange/Black (Or Black) wires.
3: Turn the ignition to the "Run" position ( don't crank the starter). Measure and record the value measured from the KEY SIDE of the Yellow wire, to the Black/Orange wire.
4: Turn the key to the "Crank" position and release. Now read the value again.
pslk3.gif5: If the value changed, follow "Method#1". If the value stayed the same, follow "Method#2".

These diagrams are from our friends at ALARMTEK AUTO ALARM

Oct 05, 2009 | 1999 Pontiac Grand Am GT

1 Answer

Where is the starter on a 2002 chevy express 3500 truck

The starter is located in the back of the engine on the passenger side underneath bottom side of the engine :)

Jul 17, 2009 | 1999 Chevrolet 3500

1 Answer

Starting is a problem

YOUR IGNITION CYLINDER NEEDS TO BE REPLACED your passlock system needs to see the magnets in there turn at same time and as they get worn it thinks truck is being stolen

Oct 08, 2008 | 1999 Chevrolet 3500

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