Poncho
I have a 1998 S10 Blazer 4wd and I have a security question. I am quite sure that my PCM is partly bad. Auto headlights don't work right and my trip meter resets back to 0 after about 20 minutes after I turn the key off, and I don't have a security light that comes on at anytime. I bought another PCM and after I installed it my security light comes on and will not start. I went through the re-learn mode with no luck. When I tried to read the resistance through the ignition for the Passlock is shows open. It does not have the keyless feature. What size resister should I put between the yellow & orange/black wire to reset the PCM value for the Passlock? When I re-install the original PCM it starts fine but never get a security light.