08 silverado, viper remote start problem

I'm installing a viper alarm with remote start on a 08 Silverado. I'm using a PKUMUX as the bypass. How do I hook up this bypass? It came with no instructions whatsoever. I found an install diagram online but its very vague.
I'm also having trouble finding the ign,accesory and start wires. The wire colors I'm finding do not match up with anything on the diagrams for a 08 Silverado. This is a barebones work truck model with no power anything and a v6 engine if that matters.

Also, from reading other threads on here, people say you need to use relays and resistors on the Ign, Accy, and Start wires. Why do none of thw iring diagrams, including the one on this site mention none of this about relays or resistors? Now I'm even more confused.
I was an installer for years but have not done it since 05. These newer vehicles are more complex it seems with everything done by the computer. I remember back in the the day the only bypass that was needed was if the car had VATS! Then the transponders came out and I usually would use a key in box bypass. Now this 08 Silverado with the PK3 immobilizer is causing me headaches .

Which Viper model are you installing??

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these trucks are super easy, just use an extra circle plus key programmed and put in a universal box, ign(pink), acc(brown) power(RED / blk at backof fusebox) ground, brake(blue/white at switch) and lights(neg lt blue at switch)

petty straight forward on the install

the bypass will do the resistor stuff

the remote starter all you will have to hook up is the ignition and accessory to vehicle

just use page 7 and 8 of this guide for the bypass

Manual

Its a viper 5901

I have the alarm installed but not the remote start portion. Im having trouble finding the ign and accy wires.

they can be found on the ignition harness coming from the key switch or at the BCM.





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Thats the same thing the diagram said, but none of the wires colors match the diagram on the wires at the key switch.

note that the accessory wire on some can be brown or yellow



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Ok this is why I am confused. I saw that plug pictured, with the red clip on it. But none of the wire colors match the diagram, or that photo for that matter. This is a barebones v6 work truck, maybe it had different wiring?

I'll see if I can get a picture of the ign harness and post it on here so you guys can see. I'll try to get one later today or maybe tomorrow.

Thanks for researching this bro...alarm is working fine so far. Can't wait for the RS to get hooked up!

did you try to meter them

the accessory wire will show voltage when you turn on the switch. then when you turn it to start position it should loss voltage. then return after started

ignition will read a constant voltage all the way through the on to start.

i look and see nothing different for the 08. are you positive you do not have an 07 classic that would have different wiring.

if its the new body style it should have the same wiring we have been giving you

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I mistakenly said it was an 08. It is a 2007, but not the classic. Its the new body style. Did 07 and 08 have different wiring? All the other wire colors from the diagrams were correct, but the ignition harness is different for some reason. Could it be different because its a base model work truck package?

Cubano posted a pic of the harness. Its orange, brown, RED / white, light BROWN / black, and yellow. This is Cubano's truck I am working on.

the pin out should be the same as the manual states for the bypass.

grab a DMM and check it out

pin 1 empty

pin 2 12v Constant (Should show 12v all the time)

pin 3 ignition (Should show 12v when in the on and start positions)

pin 4 Accessory (Should show 12v when in the on positions and 0v when in start position)

pin 5 data (Passlock wire changes voltage according to ignition switch status.)

To identify Passlock wire, test wire voltage in every position:
-Keysense ≈12 VDC.
-Accessory ≈0 VDC.
-ON ≈4.3 VDC.
-Start ≈3 VDC.

pin 6 5v Reference

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Thanks Monty. I will be able to mess with I again this weekend. I am anxious to get it all working.

meter your wires to be certain but ign is pink acc is brown, we have never interfaced with the resistors on 2nd start wre all we use is a blank circle plus key program it and place it in a universla box, hook up ign acc power ground neg lights and brake shutdown and tach at injector harness, very simple vehicle to do

Did you read the previous posts? I have no pink wire in this truck. The wire colors do not match any diagrams. Also, this is a v6 engine with a distributor. Where can I find the tach wire on this engine? Is there any way I can get it behind the cluster?

CutDog504 wrote:

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Thanks Monty. I will be able to mess with I again this weekend. I am anxious to get it all working.

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Me too!

Use it in virtual tach and you won't need a tach wire. I agree if you follow the install guide you can get from xpresskit.com just test the wires in the pins stated with a DMM.

you must not be in the proper location then, i do 6-10 of these trucks i week as i work for 3 local chevy dealers and there is always pink ign, brown acc in the harnesses on the left side of the removed shroud, there are actually 2 pinks in the same harness one of them will test as 12v constant and the other will be ign, if you want a tach wire i use the lt blue at the plug on the side of the dist. just did 2 6cyl std cab work trucks this weekend

just meter the wires, quite possibly the yellow is your ign gm was notorious for early runs to flip flop a couple of the wire colors, which is why even after doing many gms every week i meter my wires for verification

Thanks for you input Jim. I will be meeting up with Cubano later today.to get this finished. I will let you know how it goes.
I always hate doing my first install on a vehicle, its always the hardest. Every one after that is usually a cakewalk. So I'm guessing the next newer silverado I do should be a cakewalk after this.

I got it all working today!!! The wiring was not like the diagram here, nor did it match the pinouts on the PKUMUX directions. But I took my time and found each correct wire by testing them with my meter in every key position. The ign was orange, accessory was brown, RED / white was 12v (+), light BROWN / black was the starter wire/keysense/data wire. And the white wire is the 5v reference wire. Once. I figured all that out it was very easy. The viper 5901 is setup for manual transmissions by default, which caused me another problem. It wouldn't start, but once I read the diagnostics, it said 7 flashes meant it was in manual trans mode. I had to go into the settings menu and change that option. After that it fired right up. I didn't even have to hook up the tach wire.

Maybe you guys can help me. I have a 2007 Escalade and I installed a Python 991 alarm w/remote start. I use the xpresskit DLPK module. I used the diagram from the website which is the same as the one that came with the module. After the install I am able to get my alarm and door locks to work, but I can't get the remote start to work. I have the same wires as described previously in the forum. I tested all wires and connected the ignition, brake,and the acc wire and still can't get it to start. When I press the remote start button the display gives me a remote start error.

If the remote says remote start error before it even tries to crack the engine, then its an isue with the alarm. Count how many times the parking lights flash when it gives you the error. If its seven times then it is in manual transmission mode. I had that problem. Read the install guide and it will tell you how to put it in auto transmission mode.

I was able to fix the remote start error problem that I was getting. It's true that the alarm comes from the factory in manual mode as default. Now when I try the remote start the dash light and the acc come on but the truck doesn't start. I'll try to look over my wires again and see if I can figure it out.

Can anyone help me with this troubleshooting. When I try the remote start the only dash light that comes on is the engine light, but it's not starting, I verified the wires with a DMM and everything is functioning properly.

what bypass and what remote starter are you using