Originally Posted By: womcat
I am having an issue with my 1998 Chevrolet K1500 P/U. My truck wouldn't start one morning, and it it took forever to figure out the problem was the passlock security system. I looked up online and found out the 10 minute reset procedure, but after multiple failed attempts, it won't work. So then I found out how to bypass it by cutting the yellow wire and checking the resistance, then getting the appropriate resistor. The problem is when I try and measure the resistance, I don't get any reading. I'm not sure what to do next. Should I buy a new ignition switch and hope this is the problem? I hate to throw any more parts at this, already replaced the fuel pump and pressure regulator before i found out it was the pass lock. Anybody have any experience with this security system? Thanks in advance for any info.
Good luck with this. I had a nightmare with my '04 Chevy Malibu Classic, that started with the classic Passlock malfunction and ate its way into the electrical system, so the fuel pump would not talk to the computer---something like that. Like you, I paid for a new fuel pump---and in my case the labor to install it, since it was physically inside the gas tank. It did no good in the long run, and to this day neither I nor the reliable for basic service mechanic who worked on the car can say if the fuel pump was really bad to start with.
I suggest trying a new ignition lock cylinder, as suggested elsewhere in the thread. If that does not work, trade in the truck before you put another penny into it. Not kidding: My Chevy was wonderful for six years, then a money pit for its last six months.
Do not under any circumstances fall for a line from a Chevy dealer that the fix is a new (re-programmed) ECU, or whatever it's called on your truck. Chevy dealers loved to suggest that to folks who had "the problem that starts with Passlock." It might work in the short term, but before long things will unravel again.
I am not familiar with this issue on pickups, but Google fuel pump and/or Passlock problems for Malibus, Aleros and similar GM cars from late '90s to about 2005 or '06. Lots of info; not pretty---mainly because there is no clear "fix" to the problem....which manifests itself in quirky ways for individual vehicles and hapless owners. (And a real shame, since apart from this one 'little' issue these were mostly good solid daily drivers.)
Amazing we never heard more about this, from the crusaders who sued over Dex-cool and intake manifold gaskets. But anyway: Lock cylinder, cross your fingers and pray.
Good luck.