Do I have Passlock

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=19963
Printed Date: May 15, 2024 at 4:33 PM

Topic: Do I have Passlock

Posted By: jeffmann
Subject: Do I have Passlock
Date Posted: October 11, 2003 at 3:27 PM

So, as I understand, all new GM vehicals have Passlock II of simmilar, right? I have not been able to figue out what passlock really is. Is it a feature of the keys, the cininders, etc that detects weather the lock was really turned or something like that?

I have to ask because I have a new 03 grand am, fully loaded with everything except keyless entry and remote entry. The key is just a standard key, I cannot see how a resister or anything is on the key - it is just a cut metal key.

So then is passlock II some sort of resister or device in the ignition lock itslef (not the key) that must be bypassed, or is it not implemented?

Replies:

Posted By: JWorm
Date Posted: October 11, 2003 at 5:47 PM

You have Passlock II. No resistor or anything in the key. Its a resistor based system that is in the key cylinder. Connection is made when key cylinder is turned.

Posted By: Chris Luongo
Date Posted: October 11, 2003 at 7:39 PM

Like JWorm says. The ignition lock throws out a certain resistance when the key is turned. Supposedly, if a thief breaks the ignition and turns it with a screwdriver or whatever, the resistance part won't happen...in which case the car will not start.

So if you're planning on putting in a remote start, you have to get around Passlock somehow. There are three ways to do it:

1. Measure the resistance, and permanently wire in a resistor of the appropriate value. Passlock is permanently bypassed, and now your car is easier to steal. And if your resistor is slightly off, your car won't start someday, and you'll be stranded.

2. Measure the resistance, and wire in a resistor, but using a relay, so the resistor only comes into play when the remote start is on. You won't be stranded, but if the resistance is off, your remote start won't work all the time.

3. Purchase a self-learning Passlock bypass module. There are many brands available. bypasskit.com is probably a good place to start. These modules re-learn the resitance every time you start your car with your key.

In my opinion, #3 is by FAR the best and most reliable way to go. For a small cost, you have nearly 100% reliability, wiring is simple, and you don't have to fuss around measing the resistance or anything like that.

Posted By: HamiltonAudio
Date Posted: October 16, 2003 at 7:56 PM

what about the PL2002/2003 module? its a resistor based bypass that uses a pot and an led to "program". turn the key to run..now turn the pot all the way to the left. slowly turn to the right till the LED comes on, and pay attention to how far past you need to go to turn the LED off. now back up the pot to "centre" it between the two points where the LED lit (its actually REALLY easy when you see it).

no learning, no failing. simple resistor pack with a hard-wired pot that sets the resistance. once its setup, it can NEVER forget (unless you turn the pot). no memory to lose/fail/etc. simple, and effective. and CHEAPER than the learning ones.

the only other one I like better is the PLDATA, which connects to the data wire in the ADL plug under the dash. it literally talks to the cars computer and tells it its ok to start (rather than fooling it by duplicating resistance).