So you have ripped out the evil Cobra alarm system and now you are missing the remote keyless entry. Here is a solution that cost under 25 dollars American, is totally reversible, does not cut into any wires and has better than 100 foot range.
I was installing my shifter system and new cables this spring and in the process I decided to remove the immobilizer and the alarm just as a precaution against bad things to come. After I finally pulled the alarm cable off the module I noticed that the connector looks and awful lot like an ATX connector on a PC power supply. Could it be! Sure enough the connector is a standard ATX connector. Hmmmm…
So I get on line with Amazon and locate this ATX extension cable for less than $6 …OK cool.
https://www.amazon.com/gp/product/B000FL60AI/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
attachment.php
Wonder if they sell an RKE module for a reasonable price? Well they do! And only $17.
https://www.amazon.com/gp/product/B006QH9C5A/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
So of course I take the RKE module apart to take a look inside. Pretty good looking PCB with some standard relays, peripheral drive chip and a couple of devices I don’t recognize. The two high current diodes in the upper left by the connector are for the lamp drive and they isolate the left and right side signals. I also notice the antenna wire has no strain relief which I fix with a tie rap. I also tuck a wire loop inside that can be cut to gain more actuation time if your install has pneumatic door locks. I did not like the wire loop hanging out the module just waiting to get hooked on something or broken.
http://www.lotustalk.com/forums/images/LotusTalk_2015/attach/jpg.gif
So just like the comments on Amazon say, the instructions for the module suck. But there are enough comments on Amazon to figure things out easily. Basically the Elise requires a ground signal to be provide to the central door lock module inputs to energize lock and unlock. This function is provided by the RKE module via the relays. So all that needs to be done is to tie the commons of both relays to ground (the yellow and yellow/blk stripe wires). Then the normally open contacts (white and white/blk strip wires) to the appropriate input on the door module input. I also connected the brown wires to the lamp circuits so the lights blink when locked (1 blink) or unlocked (2 Blinks).
Here is a picture of the cobra alarm ATX mating connector with the labels that were extracted from the lotus wiring diagram. The following connector pins will be connected to the RKE module.
Pin 1 = Lock signal
Pin 2 = Unlock Signal
Pin 5 = Right Lamp Circuit
Pin 6 = Battery (un-switched)
Pin 7 = Left Lamp Circuit
Pin 14 = Ground
http://www.lotustalk.com/forums/attachment.php?attachmentid=1096842&stc=1&d=1498012310
http://www.lotustalk.com/forums/attachment.php?attachmentid=1096850&stc=1&d=1498012310
Here is the RKE Module connector routing to the ATX connector with wire functions.
Orange wire = no connection (NC)
White wire = Lock Sjgnal connects to Pin 1 of ATX connector
Yellow wire = Ground for Lock Signal connects to pin 14 of ATX connector
Orange/blk stripe wire = no connection (NC)
White/blk stripe wire = Unlock Signal connects to Pin 2 of ATX connector
Yellow/blk stripe wire = Ground for Unlock Signal connects to pin 14 of ATX connector
Black wire = Module Ground connects to pin 14 of ATX connector
Red wire = Battery un-switched connects to Pin 6 of ATX connector
Brown wire 1 = Right Lamp circuit signal connects to Pin 5 of ATX connector
Brown wire 2 = Left Lamp circuit signal connects to Pin 7 of ATX connector
Green wire = no connection (NC)
Basically you connect the same function wire from each connector together. The three wires on the RKE module identified as ground get connected together and tied to the pin 14 ground wire of the ATX connector. Once you verify everything is functioning the extra wires can be cut off to reduce bulk.
http://www.lotustalk.com/forums/attachment.php?attachmentid=1096858&stc=1&d=1498012437
Here is the module harness connected in the car. Notice the tie wrap installed around the original alarm connector and the ATX connector to keep the connection secured.
http://www.lotustalk.com/forums/attachment.php?attachmentid=1096866&stc=1&d=1498012437
Enjoy the RKE function again with very good range!!
I was installing my shifter system and new cables this spring and in the process I decided to remove the immobilizer and the alarm just as a precaution against bad things to come. After I finally pulled the alarm cable off the module I noticed that the connector looks and awful lot like an ATX connector on a PC power supply. Could it be! Sure enough the connector is a standard ATX connector. Hmmmm…
So I get on line with Amazon and locate this ATX extension cable for less than $6 …OK cool.
https://www.amazon.com/gp/product/B000FL60AI/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
attachment.php
Wonder if they sell an RKE module for a reasonable price? Well they do! And only $17.
https://www.amazon.com/gp/product/B006QH9C5A/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
So of course I take the RKE module apart to take a look inside. Pretty good looking PCB with some standard relays, peripheral drive chip and a couple of devices I don’t recognize. The two high current diodes in the upper left by the connector are for the lamp drive and they isolate the left and right side signals. I also notice the antenna wire has no strain relief which I fix with a tie rap. I also tuck a wire loop inside that can be cut to gain more actuation time if your install has pneumatic door locks. I did not like the wire loop hanging out the module just waiting to get hooked on something or broken.
http://www.lotustalk.com/forums/images/LotusTalk_2015/attach/jpg.gif
So just like the comments on Amazon say, the instructions for the module suck. But there are enough comments on Amazon to figure things out easily. Basically the Elise requires a ground signal to be provide to the central door lock module inputs to energize lock and unlock. This function is provided by the RKE module via the relays. So all that needs to be done is to tie the commons of both relays to ground (the yellow and yellow/blk stripe wires). Then the normally open contacts (white and white/blk strip wires) to the appropriate input on the door module input. I also connected the brown wires to the lamp circuits so the lights blink when locked (1 blink) or unlocked (2 Blinks).
Here is a picture of the cobra alarm ATX mating connector with the labels that were extracted from the lotus wiring diagram. The following connector pins will be connected to the RKE module.
Pin 1 = Lock signal
Pin 2 = Unlock Signal
Pin 5 = Right Lamp Circuit
Pin 6 = Battery (un-switched)
Pin 7 = Left Lamp Circuit
Pin 14 = Ground
http://www.lotustalk.com/forums/attachment.php?attachmentid=1096842&stc=1&d=1498012310
http://www.lotustalk.com/forums/attachment.php?attachmentid=1096850&stc=1&d=1498012310
Here is the RKE Module connector routing to the ATX connector with wire functions.
Orange wire = no connection (NC)
White wire = Lock Sjgnal connects to Pin 1 of ATX connector
Yellow wire = Ground for Lock Signal connects to pin 14 of ATX connector
Orange/blk stripe wire = no connection (NC)
White/blk stripe wire = Unlock Signal connects to Pin 2 of ATX connector
Yellow/blk stripe wire = Ground for Unlock Signal connects to pin 14 of ATX connector
Black wire = Module Ground connects to pin 14 of ATX connector
Red wire = Battery un-switched connects to Pin 6 of ATX connector
Brown wire 1 = Right Lamp circuit signal connects to Pin 5 of ATX connector
Brown wire 2 = Left Lamp circuit signal connects to Pin 7 of ATX connector
Green wire = no connection (NC)
Basically you connect the same function wire from each connector together. The three wires on the RKE module identified as ground get connected together and tied to the pin 14 ground wire of the ATX connector. Once you verify everything is functioning the extra wires can be cut off to reduce bulk.
http://www.lotustalk.com/forums/attachment.php?attachmentid=1096858&stc=1&d=1498012437
Here is the module harness connected in the car. Notice the tie wrap installed around the original alarm connector and the ATX connector to keep the connection secured.
http://www.lotustalk.com/forums/attachment.php?attachmentid=1096866&stc=1&d=1498012437
Enjoy the RKE function again with very good range!!