This is an afterthought and many of you were interested in knowing how I went about putting a push to start system in my 2007 Jeep Grand Cherokee. Mind you this set up is applicable to all years and versions of the WK, so take note.
As a warning, you are essentially bypassing your factory system. I did mine in a way that it was still functional if I ever needed to access it for any reason on the roadside, but use caution if you're unfamiliar with how 12v systems operate. While it's not as difficult as it seems, it is not for a beginner.
What you will need:
A Push to Start Ignition System (Welcome to Advanced Keys
A DEI 556U Bypass Module (Amazon $15.00)
2 SPDT 30/40 Amp Relays (Amazon $1 ea.)
2 1N4001 Standard Diodes(The more the better just in case) (Amazon/Ebay)
An Extra Ignition Key (Unless you don't mind using your only key. Your call.)
T15/T20 Torx (For removing the ignition switch)
A Trim Removal Tool ( For removing the trim around the key cylinder)
a copy of your key from the hardware store. (Just the keyblade is necessary)
A Decent Understanding of 12v Electrical Systems.
First, I used a system from the Website Welcome to Advanced Keys
The model number of the kit that I used was the AK-PSB06 (Which doesn't include the PKE((Passive Keyless Entry) Just the starting function. I did this because I was unsure how it would arm/disarm my aftermarket 2 way system.
Before we dive into this, you will need to go to your local hardware store and get a copy of your ignition key made. All you need is the metal copy, as the transponder portion will not be important. Once the key is made, you will use this later in the install to bypass your shift mechanism.
The Ignition System is pretty straight forward. If you're familiar with remote start installation, this will be a breeze.
For those of you that have no experience in this area I'll make it simple for you.
The Purple ( Negative Start )
The White (Positive Start) -
Will connect to the Pink / Orange wire located at the Ignition Switch (Pin 4) This will also tap into the Pin 86 of the Starter Relay we will create later.
The Red Battery (12v) -
Will not be connected to the 12v at the Ignition switch since it's such a small gauge wire. Instead you will connect it to the heavy gauge Red or Red/White above the interior fuse panel. Connect both Red wires to this.
Blue (Ign 2)
Will be unused.
Green (Ign 1)
- Will connect to the Pink/Light Green at the ignition switch ( Pin 3)
Black (Ground) -
Will be connected to the vehicle's chassis either through a self tapping screw or through a factory ground point. I used a self tap into the pillar below the interior fuse panel.
Yellow (Accessory ) -
This is where it gets fun. The WK has what is called a multiplex ignition system. It utilizes one wire for multiple things. In this instance, the accessory wire in this vehicle is Purple/Brown (Pin 2) This wire is also a second starter wire. Do not connect this wire directly to the Purple/Brown. This is where our relay system comes in.
Follow the diagram above to create your relays. This is absolutely necessary as it controls the starting function of your vehicle as well as major electrical components. You will notice in the diagram above that it mentions an orange negative accessory and purple negative start wire. Ignore this. Instead connect those wires to a ground source. On pin 86 of the accessory relay (On the left) Connect this to the Yellow
Accessory wire from the PTS system. On pin 86 of the Starter Relay (On the Right) tie this into the White
start wire from the PTS system.
If you're unsure about resistors for this step, I've included this diagram for your reference in locating the correct value.
Moving on to the next harness on the push to start system
Orange (Bypass Control Module(+) ) -
This wire outputs a 12v power source and will be used as a 12v source for your 556U . I will go into that later.
Red ( Backup Relay)
- Use this for pin 86 on the relays listed above.
Grey (Ground While Running Output (-) )
- This wire outputs a negative signal when the system is initialized. It will be used as a ground source for your 556U. I will go into this later.
White (Neutral Safety Input(-) ) -
This wire isn't necessary unless you buy the kit with remote start function. If this is the case connect it to ground.
Purple (Push Start Enable (-) )
- Once this wire sees a ground signal, it will enable the system to be able to be started. Seeing as I already have an aftermarket alarm system I connected this wire to the unlock wire from my alarm system, so when i hit the unlock button on my remote , the system enables and I am able to start the vehicle . The system only enables for 30 seconds, so you have 30 seconds to start the vehicle before it times out. In which case you would have to hit unlock again. If you get the keyless entry version of this kit, a FOB will be included which will automatically trigger the system. No connection necessary in that case.
Pink (Wait to Start (+) )
- This wire is for all of you CRD Diesel WK owners. Connect to your Glow Plug Indicator light, or program the system to wait a set amount of time before it engages the starter.
Brown (Brake Input(+) ) -
This wire requires an input of 12v and will connect to the White/Tan wire above the brake pedal. This wire will test positive 12v when hte brake pedal is depressed.
Yellow (Tachometer Signal) -
This wire requires an AC current from the vehicle that shows the system when the vehicle starts. It will prevent the system from over cranking the starter. This is absolutely necessary that this wire is connected. This easiest place to connect this wire is to one of the fuel injectors in the engine bay. There will be two wires coming from each injector, and you want to connect this wire to the uncommon wire of the two. For example. Injector 1 will have a blue and a white, injector 2 will have a green and a white, injector 3 will have a brown and a white. The uncommon wire would be anything other than white. (The color isn't actually white. I'm just using this as an example.)
The jumper settings for the Push to Start System will stay in their default position if you get the system with the keyless option. If you choose to only use the push start feature like I did you will need to change the JP2 jumper to Ground Enable. Other than that your system is wired and will move on to programming. (Programming directions are included in the kit and is too much to list here, but is very easy and guides you step by step on how to do so. )
Now for the 556U.
The 556U is what the 12v industry refers to as a key in the box. Essentially what you do is you take one of your existing keys and place it in this special box, which sends the transponder signal to your Ignition ring antenna which tricks the vehicle into thinking that there is a key in the ignition allowing it to start. This only activated when the system is initiated allowing your factory security system to stay intact.
In the above diagram you will see that there is a plug that contains a red, blue, and white wire.
wire will connect to the Orange wire from the PTS system.
wire will connect to the Grey wire from the PTS system.
wire is unused.
The secondary Plug contains a black, and a black/white. These wires are actually tied together and form an antenna. You route this wire up to the ignition switch, where you will wrap it as many times as you can around the antenna ring that surrounds the key cylinder.
I secured the wire to the antenna ring with a glue gun. This is ideal and will create a strong bond so that the antenna will never fall off. This is VERY
important that it never falls off.
After you have done those things, your system is wired and ready to go!
To finish installation, remove the trim that surrounds the key cylinder. Set this to the side as this is where you will be mounting your push button switch.
Under the trim piece, you will see two Torx screws that are holding the ignition switch in place. Remove these 2 screws .
I borrowed this image from Jeepforum since I didn't have my own . (Thanks PeterF!)
Next, you will need to go behind the ignition switch and unplug the ignition harness that you tapped into early. You will be leaving this unplugged so you can bypass the shift lock system.
At this point you will need to take the blade of the key that you made at the hardware store and insert it into the key cylinder and turn it once into the accessory position. This will disable the shifter so that you will be able to shift the vehicle since there will be no keys from this point on. Since the ignition plug is unplugged from behind the switch, there should be no electronics enabled when you turn on the key.
After this is done, push the key cylinder back into the dash just far enough so that you have a cavity for your switch to fit where the cylinder once was.
The trim that you removed earlier that surrounded the key cylinder is almost the exact size of the Push Button. You will need to round out the inner diameter just slightly to get the button to slide in, but it doesn't take very much effort to do so.
After you have done this, connect the push button to the starter system using their provided harness and slide the button into place where the ignition switch once was.
Congratulations! You now have a completely keyless Jeep WK with a push to start system.
I don't believe that I'm forgetting anything, but if any of you have questions, don't hesitate to ask!
Thanks for having me!