Getting ready to expand Stage2 testing so it's time to put together a little DIY showing how to add the new wires to your Stage1 harness. The process is fairly simple as you'll see below.
Disconnect the negative battery terminal in the trunk. When you later reconnect it you will need to reset your clock, etc.
Access the DME and unplug the Stage1 control box. You will have received 4 new wires. Red, black, green, and brown. There wires are going to be inserted in the large DB25 AMP connector.
Using a small screwdriver remove the DB25 shell by removing the two bolts and nuts holding it together. Put something under the connector, like the DME cover, to catch the two retaining bolts that will now be loose.
The DB25 has small 1-25 numbers indicating the positions. They can be difficult to photo but are easy to see with the connector apart like this. Each new wire is going to go under the rubber grommet and in to a specific hole. Double check before putting the wire in the hole as once in they don't come out without an (inexpensive) DSUB extractor tool that most won't have handy.
Red power wire goes in to pin 22
Black chassis ground goes in to pin 10
Green CAN wire goes in to pin 2
Brown CAN wire goes in to pin 15
You'll notice there are many more open spaces. These are mapped to additional input/output signals for future feature expansion.
Once the wires are installed the DB25 will look like this.
Reinstall the black DB25 cover. The bolts with threads missing go on the sides while the ones with threads from top to bottom screw in to the nuts at the bottom of the connector.
Coming soon where to connect these wires in the DME box!