2003 GMC Sierra Content Security light

then you have a cut in bypass ( you cut into the yellow passlock wire)    go with the 457G or the XK01 and save yourself a ton of griefKevin Gerry

Certified Electronics Technician

MECP First Class Installer

Owner/Installer

Classic Car Audio

since 1979

I had this same problem when a customer brought me one of those cut modules that have set resistances through dip switches. The truck started but when it got colder he would get the Passlock light go on and sometimes it would not start at all and the truck would get put into long tamper mode. I replaced the module that he supplied with a self learning PLXR and he was set and no lighton the dash. This will solve your problem that your having with the Passlock light.Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

FYI   PLXR is now a PLJXKevin Gerry

Certified Electronics Technician

MECP First Class Installer

Owner/Installer

Classic Car Audio

since 1979

I deal both Avox and DEI, the Avox bypass is ok but nothing beats a DEI 457G in a case like this! One wire and it's done.....Mike M2

Tech Manager

CS Dealer Services

I'm having the exact same problem on the exact same '03 truck. Just last week I did the exact same Autopage unit in an '05 using the same bypass method and now I'm having problems? I went the cheap route, and used a relay with resistors, and I'm within 10 ohms (not K ohms)so it's safe to say that resistance is not the problem. It Remote starts fine. It works fine with the key, it just turns on the light when the remote start unit is turned off and the truck takes over. I have a bypass ordered, so that should take care of the problem when it gets here. I'm the type of person that wants to know WHY a problem is happening. If everything works fine, why does the light turn on? What's happening in the transition between the remote start turning off and the truck taking over that would do this? If you think about it, when the key is turned on, isn't that the biggest transition? All pressing the brake pedal does is turn off the power that's already being provided by the key switch. The truck is a base model truck, so there's no factory alarm to disarm. It didn't even have door locks until about two hours ago. Please help!!!"Drive it like you stole it"

No one? I haven't seen the truck again, but I was thinking that it could have something to do with either the collapse of the relay coil or high resistance through the relay. The light comes on after the relay switches from the resistors to the OEM R-code, so the problem has to be there somewhere."Drive it like you stole it"

I had an '03 bare bones GM Silverado work truck pickup do the same thing- drove me crazy- the security light was on while driving no matter how I started the truck-- put it through 100 ignition cycles and it went away on its own-  I had "metered" the passlock wires at the ecm- after I had gone through the resistance determination for setting the potentiometer in a GMATTII- just to double check- and that is what set the light on- I don't double check any more- and haven't had a concern since.  I figured that once it saw a code- it is a hard code- and keeps the light lit.  I refused to give it back to owner with the light on- took me about 2 hrs to get rid of it- checking and double checking all wiring etc.Brcidd - Engineer That Does Remote Starter Installs on the side.

I wish I would have seen that last post sooner. I bought two bypasses, one DEI and the other Peripheral. Both still turned on the light when they turned off. I had no choice but to resort to bypassing the factory system all together. I'll admit it, I was out of options and this one does work. I know I would have double checked it; once with the leads one direction and once with them switched around. I just use the wires at the ignition switch though, not the ECM. I figure any change in resistance in the wires on the way to the ECM will still be there, because the bypass is being installed near the switch, not at the ECM. If I see the truck again or have one with the same problem, I'll have to try cycling the ignition 100 times and see if the problem goes away. Thanks."Drive it like you stole it"

I saw the owner of the '03 bare bones truck the other day- he told me the security light comes on occasionally- so my hard-wired bypass evidently is not getting it.  He is not concerned- although it is anoying- I told him I would install a learning module if he wants me to- looks like certain trucks don't like to be bypassed the hardwire way.........Brcidd - Engineer That Does Remote Starter Installs on the side.