Here I am going to explain why you don't have Keyless entry, how to tell whether or not you have Keyless Entry installed, and how to add the factory option without use of an aftermarket alarm system.
How To Tell If You Have Keyless Entry Installed.
There's a very simple way to determine if you Keyless Entry or not all you have to do if call a certified GM dealership and provide them with your Vin number so that they can look up what features were given to the vehicle when it was born or sold. Or you can try this trick, here you take paperclip or conductive wire (ex. Copper) and you connect to your DTC port or Diagnostic Trouble Codes Port or OBDII Port and connect the top row of Pin 4 to Pin 8. The top is wider than the bottom on the port itself. The split second you do this the doors should lock and unlock or vice-versa Thus going into Keyless Entry Programming mode. If nothing happens You Don't Have Keyless Entry Installed. Continue Reading...
Keyless entry is not a standard option therefore if you did not request it at the dealership the day you purchased the vehicle or it didn't come as a standard option or included package then you won't have Keyless Entry. If you vehicle does not come with power locks to begin with you will not have Keyless Entry. If your Keyless Entry Receiver or as GM defines "Remote Function Activation Module" is bad you will not have Keyless Entry. If you don't have a key fob or your key fob has a dead battery you won't have Keyless Entry.
How to Add Keyless Entry (Aftermarket)
To Add Keyless Entry (Aftermarket) you would simply purchase an aftermarket Keyless Entry/Remote Start system like Viper, AutoPage, or even Avital. Wire it up following a scematisc and set up the provided key fob. If you are unable to do this you can take you vehicle to auto electronics specialist and have them install whichever system you provide for you for a fee.
How to add Keyless Entry (Factory(Equipped)
If you vehicle does have Keyless Entry but it is not enabled or you lack a key fob or you key fob is not programmed then all you simply have to do is take a paper clip or conductive wire and connect pin 4 to 8 or your vehicles DTC port once the doors lock and unlock very quickly on the key fob you want to use with the vehicle press and hold the lock and unlock button simultaneously for 15-20 seconds doors should lock and unlock confirming key fob is now pair to vehicle then put your key in turn it to "ignition on engine off" then back off and remove paperclip to exit Programming then your all set. You should now have Factory Keyless Entry working you MAY have to repeat this process should your key fobs battery go bad again.
How To Add More than One Keyless Entry Remote
Insert paperclip or conductive wire into DTC port then press and hold lock and unlock or first key fob for 15-20 after the doors lock and unlock confirming sync quickly press lock and unlock simultaneously on the second keyfob for 15-20 seconds until the doors lock and unlock comfirmcon sync effectively repeating the last step, once all key fobs are programmed up to 4 or 5 depending on vehicle you must exit Programming by insert your key into the ignition and and turning it to the "ignition on engine off" position and back off and remove paperclip clip and your all set.
How To Add OEM Keyless Entry To GM Vehicles That Did Not Originally Come With Keyless Entry Factory Installed
If your vehicle does not come with Keyless Entry Factory Installed but you don't want to use and aftermarket then your job just got a lot harder but nevertheless it can be done despite what some will say this should not require a dealership to enable the feature.
You will first need to locate what is called the RKE. You may find a video on YouTube or online pertaining to your vehicle that will show it's location, part number, and appearance. But if your vehicle doesn't have the feature then this part won't be there instead in it's location will be a bypass or just simply nothing you will need to go to a dealership or junkyard to obtain this part if your lucky the connector is there but it has a cover or bypass on it thus disabling the feature and you would simply install it and your done. But you notice a bypass which will most likely have a different connector with less wires the you will need to replace your accessories wiring harness.
This wiring harness connects most of the the accessories of your vehicles on the same part which will essentially determine what features your vehicles has and can add later. In order to obtain this harness you will need to find a vehicle that has Keyless Entry and remove the harness from there and install it to your vehicle it is the only way. This method will involve removing the seats dash trim and panels depending on which vehicle you own.
The vehicle this was researched from myself was a 2001 Chevrolet Express 3500 with donor parts coming from a 2002 Chevrolet Express 3500 Both Vehicles Had Power Locks And Windows but the 2001 did not have Keyless Entry because the harness did not support the Remote Module required to enable the function.
So after changing the harnesses it worked instantly no scanners no resets I actually replaced the harness with the original one still in the vehicle while listening to the vehicle entertainment systems in it's factory location to avoid removing the entire dashboard you need to remove the brake pedal bracket assembly to fit the nessasaryy wires in there factory locations in the vehicle.
I will post pictures for the non-believers and a video outlining where the parts go and what is there instead when you don't have Keyless entry
This is the Interior Lamp Control on a factory GM Floor Mat this Is Located in the same location as the Receiver But will only be present if you vehicle does not have Keyless Entry installed
Harness Picture coming soon
Upon doing more research and inspecing different Vehicles with Keyless I found that the Keyless Entry module for the Chevy Tahoe will also work with Chevy Express and vice-versa the part number is different but upon disassembly I found that they only difference between the two part numbers with that the one referenced for the Chevy Express has wire for an antenna with the Chevy Tahoe uses a "filament" antenna prong sodered to 2 ends of the board
