1998 gmc sierra has me confused

Well, sure enough passlock was messing me up. I metered the value from the hall sensor, made up a resistor pack to match, spliced it in and: Varoom. Remote start functions. Time to dig back through the ecm coding and see where to turn that bloody password handoff between the PCM and the evo module is. Damned thing is, the PCM is already set to off and I never have to do a relearn procedure when swapping pcms. Something is weird here. Anyways, on to finishing the alarm/remote start.

I just uploaded a couple of Zenisis Files. Don't know if they are same as your system or not. EasyCar Zenisis Remote Start Zenisis ZN502 Install GuideWhen all else fails, Read the Instructions

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smokeman1 wrote: I just uploaded a couple of Zenisis Files. Don't know if they are same as your system or not. EasyCar Zenisis Remote Start Zenisis ZN502 Install Guide

Thanks, I appreciate it. But I have both the user manual and the installer manual already. Came in the box with the system. Cheers.

Well, it's all in and working as per. Gotta say, I actually like the system. Lots of features and easy to use. Little bit of a learning curve in becoming familiar with the button combinations for anything besides the basic functions, but it's like that with any "new to you" gadget. Seeing how I only spent 50 bucks on it, seems like a good deal so far. Time will tell how reliable it will be. But I often find "reliability" is in the installation as much as it is in the product itself. I'm all soldered connections, neatly loomed and carefully routed so that should be good to go. I also know where I can pick up more of these "zenesis 402" systems very reasonably. I may buy another 1 or 2 so I can have a couple spare "brains" around just in case. Heck, for what I would pay for a couple spare remotes I can get a complete NIB system, which would give me a spare lcd remote (and a couple regular remotes) anyways. Next up: use some of the aux outputs to make an "anti-jacking" feature and maybe something to activate fast idle on my diesel for faster cold winter warm ups. The unit has anti-jacking, but you have to choose between starter kill and anti-jacking. I chose starter kill since it also gives the anti-grind feature. Fast idle will be super easy on my truck, all you have to do is provide a ground for a pin in the PCM harness. Easy peasy with a simple relay. I still have to install the "auto up" module to give me window rollup on lock. That's for another day because I'm just plain tired of working on it for now. I also have an IGN2 still available. I "carcked it up" when I did my install and ended up using a relay to give IGN2. Apparently, I had my dunce cap on when I tried to run IGN2 and didn't realize that the IGN2 output on the unit was pull to ground. I tried to trigger a relay with it thinking it was + and when it didn't work, I figured it was a dead output and just went with a relay triggered off IGN1. So, I may just use IGN2 on the unit (selectable between ACC and IGN2) to power the other accessories in the car like blower motor for winter heating and summer cooling. Dunno, that's down the road a bit too. Just going to enjoy the AS for a while before getting in under the bloody dash again...

Hmm, now that I think about it, that AUX2 output is also pull to ground. I might be able to just use it directly to ground the fast idle pin....

Well, chuck another curve ball in my direction. I decided to hook up the dome light on/off with lock/unlock. Neg output and 250 Ma. Easy enough: chuck a relay in and Bob's yer uncle right? I hook it up to the relay so the alarm pulls ground and: Nothing. Nada. Zip. Zilch. Throw in a couple curse words for good measure. Well that's the second time an output from that harness that has given me nothing so I pull out the DMM and start checking. Maybe the plug is dead on the board. The DMM shows it's actually supporting 350Ma, 100Ma more than the manual spec and more than enough to trigger a relay. So what's going on? I flip the DMM over to volts and get a 6V reading. Sunova......it's set up for a 5V relay. Well that's a PITA. Who builds a car alarm/starter with 5v output? I do not feel like ordering parts and waiting for them to arrive from Hong Kong or wherever. Even then, I'd end up with some stupid micro relay better suited to a computer board or similar application. Not ideal and most max out around 10A. Enough to power things like the dome light, but it's not going to be enough to run things like ACC 2 for heater motors and the like. I need 20A, 30A or 40A automotive style relays. So how do I make a 5V signal trigger a 12V coil? Time to make a simple amplifier/switch. I grab an NPN transistor from the spare parts bin, a resistor, a diode, some heat shrink, the glue gun and a couple female spade connectors. A little soldering and I have an amplifier that steps up the 5V signal to 12V and it triggers a 12V relay just fine. Since it's a negative trigger, I just drop it into the negative side of the relay coil and we're good to go. No special relays, no fuss, no muss. Happy again. A nice simple circuit I can make in a few seconds for all the other outputs and use conventional 12V relays.