Conversions & Swaps LSX Engines in Non-LSX Vehicles
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Wiring questions

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Old 02-16-2009, 12:28 PM
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Default Wiring questions

Everything in red I have figured out just thought I would add that in case someone else was curious as to what for.



I pretty much have my wiring figured for swaping my 93 A4 to a 2002 LS1 w 6 spd.

There is an orange wiring in connector C105 that says constant battery power where should I wire this in?? Should I splice this into the constant battery power to power the ecm and run them through C210.
This was emissions related deleted it and power circuit 239 because it was automatic and emissions relate (EVap) therefore the 539 circuit the LT1 doesn't have was wired into this location.

There was one circuit floating around 539 that was addressed it is the engine sensor power fuse. It was wired into LT1 circuit 239 which was for opti spark. BEWARE this was a 10 fuse link this must be upped to 20 AMP 15 might get by due to rear o2 delete and air delete but am still sticking with 20.

I also realized that there is a starter relay control coming out of C100 in the LS1 and I can not find a place for it. Can this wire be deleted or should I be wiring this to somewhere under the dash.
This is not used the 93 uses a separate power circuit using a VATs Pass Keycode module along with tying into auto/manual neutral/park switch and ignition. This power wire is then linked directly from the positive junction under and out the dash on a 10 gauge i believe purple wire through connector C210 unique to LT1 cars.

Also what are the serial data lines coming from the LS1 that i should wire into the LT1 to keep the serial data functioning?? I found a dark green serial data wire but I can't find the tan wire which I believe it should be.Serial data is a kind of GM communication link that sends analog signals back and forth with a parallel connections both ends are terminated meaning the signal is grounded in the ecm after it was read terminating it and on the other end it was also grounded in the traction control or abs wherever it ends; therefore if you ground the wire terminating the signal and cap the positive wire the ecm used the abs and tcs will still talk and work as independent systems. The 2002 uses serial data 2 connection which is dark green or purple. This wire is only needed for obdII diagnostic the port connects with 2 grounds 1 power and the serial data 2 connection.

For the auto to manual trans swap. I can delete the TCC signal in the body connectors I believe because its only a ground but how do I get the reverse tail lights to work?? Is this simply tying the wire into the exterior light circut? Also do i move the park saftey switch to under the clutch pedal for neutral starting and vats to work? Last question for this is for cruise control is it possible to tie in the Clutch Anticipated signal into the brake signal to disengage cruise or do these signals function differently. The TCC signal cavities H and J C230 can be deleted they are only grounds for diagnostic purposes allowing you to lock the torque convertor clutch through the DLC to test it and for communication on when to lock.
The reverse tail lights are a lt green wire tied into a reverse indicator circuit on the shifter. It receives power from the I/P fuses. Its just a switch locate the green and brown wire in the wiring harness and remove the connector for the automatic and wire it into the existing brown wire and lt green wire in place already and just plug it in and the lights shoudl work. If the car was originally a manual just plumb it in through the C200 connectors.
To disengage cruise control there is a switch on the brake pedal that is a two way switch. It has three wires a a ground and the two powers I believe it is wired. One is activated off of the brake and the other lt blue wire ties into the hazard lights remove this and tie into the cruise disengage switch on the clutch pedal already. You cannot tie this into the clutch safety because the clutch safety defualt is open and the defualt for the cruise disengage is closed. The cruise will be functional now since it is a separate circuit with its own motor just tie it into the throttle.


Also can I delete air/egr/evap and rear O2's before getting my computer flashed and run the car for a while or do I need these flashed before I can run?
Yes but probably wont run well and not applicable for 93 since it is an older model of passkey not using serial data class 2 and will not work without vats disabled. DON'T get this confused with disabling the alarm. All it does is allows the pcm to send the fuel enable signal without recognizing the key because the vats on the 93 is located on the car and recognizes a separate key (for the start circuit self-contained under the dash). It is your key only that can start the car still if you disable the vats on the pcm.

The vats system also does not have to be rewired to work correct?? If it was functioning before it still should now??
This was answered up but yes it will work it is a separate circuit. No rewiring necessary

Sorry for the all the questions but thanks.

I guess i figured it all out haha. Just off memory now.

Last edited by Radcannon; 05-09-2009 at 02:25 PM.



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