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Old 02-04-2003, 12:08 PM   #16
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Member#: 5743
Join Date: Apr 2001
Chapter/Region: Tri-State
Location: nj/nyc
2007 Kia Optima
gold brick

Default Re: Ultimate Alarm/Remote Start Thread

good info! i'm very curious to see what function the white/yellow wire is, is it possible for you to take a digital snapshot of the wire location? i have to take a look at the wrx electrical service manual again for this wire.

PAC makes a Universal Trigger device called TR-7. It can sense low voltage triggers such as the neutral wire off the ECU and output a full 12 volts.



Originally posted by quynce
Alright, I decided to stop conjecturing and theorizing about putting a remote start in my 5MT WRX, and did it today. The unit was a DEI model, and also included security and of course keyless entry. I realize this has been done, but the info is scattered and hard to find. Here is some info to help out anyone considering a similar setup:

First, here are the relevant wires and their locations that you'll need:

12V Constant: Black/white -- ignition harness
Starter wire: Black/yellow -- ignition harness
Ignition wire: Black -- ignition harness
Accessory wire: Black/blue -- ignition harness
Door lock wire: red/white -- keyless module* (negative trigger)
Door unlock wire: yellow/red -- keyless module* (negative trigger)
Parking lights: Purple -- harness on front of fuse box
Door Trigger: yellow -- keyless module* (negative trigger)
Dome supervision: same as door trigger
Brake wire: white/black -- brake switch
Trunk trigger: yellow/red -- OEM alarm harness**
Neutral indicator: green/black -- ECU, pin A8***
Tachometer wire: white/yellow -- see ****
Clutch bypass wire: clear T harness above clutch, higher of two

* The keyless module is directly to the right of the fusebox.
** The OEM alarm harness is behind the glovebox, towards the drivers side. If you have the OEM alarm, it will be plugged into a harness running toward your e-brake. Otherwise, it will be taped to a much larger wiring harness.
***The ECU is under the carpet on the front passenger side. If you're looking at it from the passenger seat, harness 'A' is closest to the firewall, pin 8 is in the middle of the column closest to the firewall.
****Tach wire I used is in a harness just in front of the intake pipe, towards the front fender. Trust me, it's in there.

The only way to integrate the neutral wire is to tie it into the hood pin shutdown wire. It CANNOT drive a relay, so don't even try. (I did...) It is imperative to diode isolate it from the hood pinswitch. Wire the diode with the stripe towards the ECU, so it can only pass negative current, which is what the wire transmits when the car is in gear. It works beautifully.

To bypass the clutch, use a relay as follows: Pin 85 - (-) trigger for starter wire coming from the remote start relay pack. This is the small gauge wire, not the large guage. Pin 86 - Constant, fused 12V. Pin 30 - One of the wires in the aforementioned T connector at the clutch. Pin 87 - The other wire at said connector. It doesn't matter which goes where, because the point is only to connect them while the remote starter is cranking the starter. Doing it this way is 100% safe, because there is NO way to start the car without either having the clutch in or remote starting it in neutral.

As usual, attempt all of this at your own risk. You can damage the cars circuitry if you don't know what you're doing. Also seriously consider taking these notes to a reputable dealer to have it installed professionally.

Thanks to for the ECU pinouts.

Please feel free to add anything or ask questions.


Edit: This was done on a MY02 WRX sedan. Many of the wire colors will be the same on the rest of the Impreza line, but I'm not sure about the tach wire and neutral wire. Also, unless you installed the OEM trunk light on your RS/TS/OBS, there will be no trunk wire.
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