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Old 05-30-2017, 04:38 PM   #1
LS1ow
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Swap Harness Modification

Trying to work the final interior wiring demons out and its pretty close but i need some help.

99 Z28 originally a M6, being swapped to A4.

Pedals have already been swapped to auto pedals. Will be using a stock 4L60e shifter out of a 01 WS6. PCM and engine harness out of a 00 LS1/A4.

The switches at are my point of interest/trouble.

1. Stop Lamp Switch

Seems to be just plug and play. Same style unit as a M6 car. So we should be good here. If im wrong, let me know

Now, things start to get funky.

2. Clutch override switch
-Black/White & Grey wire 2 pin connector

Common sense says this is a 2 pin connector, to a regular "plunger" switch.
I should be able to just snip the connector off the wires and connect them together. Thus rendering the clutch override switch compressed all the time since the circuit is complete, therefor, itll start ! or crank atleast

3. Neutral Safety Swtich
-Green & Purple/White 2 Pin Connector

Same as the clutch switch no? if its a 2 pin connector, and its just a contact switch, wouldnt just connecting the 2 wires successfully by bass the switch?

HOWEVER, from what ive read, i can just snip the 2 wires and extended them to plug in to the A4 NSS. Pardon my stupidity, but i have not ever had to replace a NSS or mess with one on one of these cars, so were is it? is it on the shifter assembly ? or on the trans it self? Google gives me mixed answers. I have the shifter assemly i planned on used at home in a box, when i leave work ill swing by and open it up. See if theres any plugs or anything on it.

I know a NSS is a "safety" but honestly, you have to be a real buk buk buking idiot to start your automatic car in gear, so unless its needed to pass tech or anything, im okay with just jumping it. But if its something as simple as just extending some wires to a new plug, then may as well.

4. Reverse Lamp Switch
-brown & light green 2 Pin (Possibly, not 100%)

Folktale says that the Reverse lamp switch is on the side of the T56, which leaves me wondering what harness the reverse light switch is actually a part of? Is it on the dash harness or is it on the engine harness? I dont recall seeing any wires dropped down threw the shifter hole, or do they go threw on a grommet somewere?

I assume that on the A4 shifter i have boxed up, there will be some sort of contact switch on it for the Reverse lights. Which would allow me to just plug the existing reverse light switch into that switch and call it a day? Of am i just going to run a toggle for my reverse lights like there a light bar on my jeep???




Like i said earlier, im not really familiar with this stuff cus ive never had to do it. So ill be checking my shifter assembly i have to see if theres any plugs/switches on it. If there is that should answer some of my questions.
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Last edited by LS1ow; 05-30-2017 at 04:42 PM.
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Old 05-30-2017, 05:55 PM   #2
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Brake light switch should be the same. The cruise stuff might be different but assuming no cruise? Don't know if the tcc switch is necessary either? What dash harness do you have? You shouldn't need to bypass both the nss and css. Nss should be on the shifter. Jumping either one will bypass it. I believe the rls is on the side of the t56 and off of the shifter on the a4. Bueno?
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Old 05-30-2017, 06:16 PM   #3
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Opened up the box my shifter is in and it looks like it has a large switch assembly on it. Maybe a 6 or 7 pin flat connector. I'm assuming that's it. Looks like I'll be able to buy the pig tale and go from there, ya?
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Old 05-30-2017, 06:18 PM   #4
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Ya.
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Old 05-30-2017, 06:32 PM   #5
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Quote:
Originally Posted by sweetbmxrider View Post
Brake light switch should be the same. The cruise stuff might be different but assuming no cruise? Don't know if the tcc switch is necessary either? What dash harness do you have? You shouldn't need to bypass both the nss and css. Nss should be on the shifter. Jumping either one will bypass it. I believe the rls is on the side of the t56 and off of the shifter on the a4. Bueno?
No cruise or TCS. Deleted all the stuff from the bay and am using the throttle cable you provided me.

I have the stock Dash harness in the car, so it's a M6 harness. I actually went ahead and jumped the CSS when I was at my garage just before. I'll have to find the pin out for the switch on the ****er. I'll just extend the wires for the NSS to there. I'll have to track down were the RLS switch wires are still.
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Old 05-30-2017, 07:07 PM   #6
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T56 might be part of the engine harness. I'm going to assume a little here, both dash harnesses usually have the css but its just unplugged. If you jumped it already, a nss won't function. If you leave it disconnected and wire up the nss, it'll function factory.
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Old 05-30-2017, 07:15 PM   #7
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Quote:
Originally Posted by sweetbmxrider View Post
T56 might be part of the engine harness. I'm going to assume a little here, both dash harnesses usually have the css but its just unplugged. If you jumped it already, a nss won't function. If you leave it disconnected and wire up the nss, it'll function factory.
So if on a T56 car the RLS is on the engine harness, and on the 4L60e car it's on the Dash harness, I have to run the wires, 2 I'm assuming, from the switch to the PCM? Or would it be to the BCM?

And that is a good point Adam. If the CSS is by passed, it thinks the clutch is pushed in. And on a M6 car you can start "in gear" as long as the clutch is pushed in. Those of you with a M6 car, if the car is in nuetral, can you start it without having to press the clutch? I never had a M6 Fbody, but both my M6 S4 I had to press the pedal in regardless of were the shifter is. But that was a German car so who knows.

From what your saying Adam, I can unsplice the 2 wires for the CSS and leave them be if I run the 2 wires for the NSS to the corispinding pins on the new plug I have to get for the shifter switch
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Old 05-30-2017, 08:06 PM   #8
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The Light Green wire feeds the reverse lights directly through connector C400. Nothing to do with computer brah. I'm assuming here but the rls is definitely on the t56 and definitely on the shifter of the a4

An fbody only has a css so with clutch depressed, you can start in any gear.

Yes, do what I said if you want a functioning nss.
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Old 05-30-2017, 09:37 PM   #9
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Quote:
Originally Posted by sweetbmxrider View Post
The Light Green wire feeds the reverse lights directly through connector C400. Nothing to do with computer brah. I'm assuming here but the rls is definitely on the t56 and definitely on the shifter of the a4

An fbody only has a css so with clutch depressed, you can start in any gear.

Yes, do what I said if you want a functioning nss.
Which light green wire? Not the same green wire as the NSS correct ?
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Nitrous - 10.16 @ 132 - 1.40 60"

Last edited by LS1ow; 05-30-2017 at 09:38 PM.
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Old 05-31-2017, 06:37 AM   #10
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The one you listed as number 4 but it'll be part of the large connector at the shifter.
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Old 05-31-2017, 06:51 AM   #11
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Quote:
Originally Posted by sweetbmxrider View Post
The one you listed as number 4 but it'll be part of the large connector at the shifter.
oh, gotcha.

I just havent found that wire yet. As we said before, i think the RLS plug is part of the M6 engine harness. I dont have the M6 engine harness, so i have nothing to go off of. rendering me, lost.
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Old 05-31-2017, 06:52 AM   #12
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Need to find the corresponding plug for this thing so i can get to wiring. It looks like the truck ones are different than the Fbody ones. And unfortunately i can only find the truck ones.
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Old 05-31-2017, 10:21 AM   #13
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Find a partout car? I think lt1/ls1/v6 shouldn't matter?
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Old 05-31-2017, 10:32 AM   #14
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Quote:
Originally Posted by sweetbmxrider View Post
Find a partout car? I think lt1/ls1/v6 shouldn't matter?
Thats what im trying to confirm now with my buddy that works for GM.


know of any cars with e 4L60e in it laying around that i can have at?
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Old 05-31-2017, 11:16 AM   #15
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Mine was a v6 and I did nothing with the dash harness, worked like factory. Unfortunately, that car doesn't have the harness you need....
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Old 05-31-2017, 12:46 PM   #16
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Quote:
Originally Posted by sweetbmxrider View Post
Mine was a v6 and I did nothing with the dash harness, worked like factory. Unfortunately, that car doesn't have the harness you need....
confirmed that is is the same connector on all A4 4th gens, however it is discontinued. I can get it from napa, but the price is super steep for a plug. gunna see if anyone has one laying around
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Old 05-31-2017, 12:59 PM   #17
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Do you have the part number? and Make?
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Old 06-01-2017, 08:24 AM   #18
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Paul found me one in his parts castle and i picked it up last night. he indeed is the man.

Time to figure out the wiring!
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Old 06-01-2017, 12:56 PM   #19
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womp womp
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Old 06-01-2017, 02:39 PM   #20
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i got the above information from my buddy that works at chevy.

Now, round 2 of confusion. but lets start with the simple stuff.

A. "Ground" -Is this as simple as i really think it is? can i just throw an eyelet on the end and ground it to the chassis?

B. "Neutral Safety switch signal"- I take it this is the wire i extend the current NSS wiring to and just connect it? Assuming 1 is a signal and 1 is a ground on the M6 NSS, i would extend the signal wire to the new piece and then do what with the ground? leave it be?

C. "Ignition 3 voltage" - lolwut. Do i just tap this into some form of ignition on power source?

D. "Back up lamp supply voltage" - Since the car was previously a M6, and the Reverse light switch is on the trans, and the wires for it are on the M6 engine harness, what do i do here? Were does this wire normally run to on a A4 car? Im pretty lost on this one.

E. "Starter Relay Coil Supply Voltage" - 1 of the 2 Thick wires on the plug, so im assuming it handles some voltage. Does this connect directly to the starter? or perhaps a relay?

F. "Clutch Start Switch Signal"- the other 1 of 2 thick wires on the plug. This one is rather confusing due to the plug, and pinout, being for a A4 car. Why does the Auto car have a Clutch start switch/What is it? Is it the same 2 pin connector clutch switch as the M6? if thats the case do i do the same as mentioned about the NSS and run the signal wire to this wire and then just ground out/leave alone the ground for the original CSS?
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Old 06-01-2017, 08:42 PM   #21
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A - Should be good with just a ground here

B - Connector 1 Pin 34 of PCM, should be an orange/black wire coming out of it. This needs to connect to Pin B as it effects Idle Air control and can set a DTC for VSS. Technically this wire handles other **** but we can deal with it later if you actually give a ****. (Hatch release and Brake Shift Interlock - both can be bypassed)

C - Can't find the circuit yet but its from C220 which has the Orange/Black wire as well. Probably somewhere near the dash/firewall area. Link showing other headaches for you. Found Instrument Panel fuse block fuse 2 TURN B/U Brown wire feeds terminal C

D - Instrument Panel fuse block fuse 2 TURN B/U Brown wire feeds terminal C and terminal D goes to the reverse lights through connector 400. C powers D my man.

E - Underhood fuse block 2 STRTR mini fuse 15amp has the purple/white coming out. The clutch safety switch has the purple/white wire which feeds terminal E and....

F - the Dark Green wire is the other one which feeds the Starter Relay coil side I believe. Other wire is Yellow/Black on the relay which should be for VATS ground signal from BCM which I assume you can ground as well as some other rewiring if you want to bypass vats. Found the last diagram I needed so some of the pieces didn't fall in till the end. Let me know if you need clarification etc
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Old 06-02-2017, 09:11 AM   #22
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Quote:
Originally Posted by sweetbmxrider View Post
A - Should be good with just a ground here

B - Connector 1 Pin 34 of PCM, should be an orange/black wire coming out of it. This needs to connect to Pin B as it effects Idle Air control and can set a DTC for VSS. Technically this wire handles other **** but we can deal with it later if you actually give a ****. (Hatch release and Brake Shift Interlock - both can be bypassed)

C - Can't find the circuit yet but its from C220 which has the Orange/Black wire as well. Probably somewhere near the dash/firewall area. Link showing other headaches for you. Found Instrument Panel fuse block fuse 2 TURN B/U Brown wire feeds terminal C

D - Instrument Panel fuse block fuse 2 TURN B/U Brown wire feeds terminal C and terminal D goes to the reverse lights through connector 400. C powers D my man.

E - Underhood fuse block 2 STRTR mini fuse 15amp has the purple/white coming out. The clutch safety switch has the purple/white wire which feeds terminal E and....

F - the Dark Green wire is the other one which feeds the Starter Relay coil side I believe. Other wire is Yellow/Black on the relay which should be for VATS ground signal from BCM which I assume you can ground as well as some other rewiring if you want to bypass vats. Found the last diagram I needed so some of the pieces didn't fall in till the end. Let me know if you need clarification etc
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Old 06-02-2017, 10:17 AM   #23
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The hardest one is B
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Old 06-02-2017, 10:30 AM   #24
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Quote:
Originally Posted by sweetbmxrider View Post
The hardest one is B
when i go on my lunch break ill have time to actually read threw everything and see the nightmares of this.


...anyone have a LS1/A4 harness??
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Old 06-02-2017, 02:19 PM   #25
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Here is the pin out diagram i used as supporting evidence for my up coming disaster.

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