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Passlock II and Remote Starting

11-22-2007, 03:18 PM
Hello again everyone.

I'm submitting this for my girlfriend who has a 2004 Chevy Blazer.
Somewhere along the line, a remote starter was installed in her Blazer and was then disabled.
The current problem is very intermittent, though it is getting worse.

Upon trying to start the vehicle, it will start but for only a second before the engine shuts off fuel. The security light will then blink for approx 15 minutes, and then after that the vehicle will allow a reattempt at starting. Sometimes it starts, sometimes it doesn't. After every failed attempt at starting, you must wait 15 minutes before trying again. Once you do start it, the security light will flash while driving but never comes on steady.
This happens about 50% of all starting attempts, and as the weather gets colder, it seems to be increasing.

I think that whoever installed the remote starter, and then disabled it, did something to cause the passlock system to think the vehicle should not be started. Its very intermittent, and hard to create a fault tree to really troubleshoot the cause.

I see there are methods to bypass the passlock system, which include cutting one of the wires to the ignition, and also installing a learning bypass module that you install in line with the remote starter.

Does anyone have any advice or experience regarding this?

11-22-2007, 08:05 PM
I sort of doubt that the install of the remote start is to blame since there are far way too many complaints simular to yours on here from others with vehicles 100% stock. I would assume the PK2 decoder that's inside the ignition switch is failing. I've also seen some being the fault of the BCM. You could do a search of my postings to see how to bypass it. $5 worth of radio shack parts is all is needed. No, you can't use a remote start bypass to permenately use as a bypass. I guess really you could but there's better ways around your problem. One of which is to use compressed air and blow it inside the ignition lock or to get a new key cut. Even though there's no chip in these keys, I have read where people have done either of these tricks with promissing results but I don't know for how long.

11-25-2007, 11:40 AM
We've already replaced the key because the original was lost... so immediately I could rule that out. I did shoot some compressed air into the ignition and have yet to really get a experiment going to see if it helped.

But the reason why I came to the conclusion it was the remote starter, was because of my internet research. All searches pertaining to this problem all pointed to the passlock system. Only a handful of folks, including the ones here on this forum, had issues with the ignition. Most of other sites, which include sites that sell remote starters, have the exact problem I describe. All say to use different methods to figure out what to do. Alot of them point to the remote starter being disabled, it gave them start problems with the normal key and ignition, then offer a pricey bypass module. No, I refuse to pay 80 dollars for something I can do myself with parts from radioshack. Its as simple as putting an ohmmeter between the yellow and black and then putting a resistor inline with the ignition.

To update my problem, I learned that the security light indeed stays on steady. This should indicate a fault with the security system, and hopefully autozone can read it.

I'll keep the forums here updated on the progress.

11-25-2007, 08:51 PM
Yes, if it stays on all the time while driving it's in the fail-enable mode. Be careful since it's in that state. If you unhook the car's battery, it will not start again until it sees the proper R-code. Again, it could be the remote start or install of but doubt it.

You say the remote start is disabled but never said how? Is the PK2 bypass still installed? If so, disconnect it and put the PK2 wires back to the way they were. That'd rule out the remote starter.

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