2003 Vortec 5.3L Wiring Harness Rework Part 1
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- เผยแพร่เมื่อ 17 ต.ค. 2024
- This will be my first video of three parts, going over the harness rework steps for a 2003 5.3L vortec engine. In part 1, I will depin unused wires from the PCM as well as identify wires that will be used in the fuse block, or connected elsewhere in the target vehicle. This process will be nearly identical for any 2003-2007 Gen 3 engine with electric throttle control, with 4L60E or 4L80E trans. For more wiring details, please visit my website, www.lt1swap.com
Download Printable PDF Files of the pin outs I use from my website here:
www.lt1swap.com...
www.lt1swap.com...
www.lt1swap.com...
Thank you for not cutting this short. You were kind and decent enough to provide this information, I (for one) am more than happy to view it in its entirety
Your site has been such a huge help for so many peoples swaps, I feel like you have had a profound effect on the ls base popularity, even if they are plentiful at junkyards and reasonably priced.... They aren't any good without the electrical side which is everyones weakpoint, except yours😎. Keep up the awesome work you are doing to help the car guys out there. and thanks
I sent an email with a question to Brandon and he got back to me, I can't believe with all he's got going on that he could actually find the time to respond. I didn't want to send an email back saying 'thanks' because it would be just another email for him to open. So I'll say it here...Thank you Brandon. I'm doing a Ls swap Miata and needed to delete the transmission wiring. My L33 5.3 aluminum block is an '05. He explained that on the pin-out for '99 - '02 he has the transmission delete highlighted in red. Same engine basically but I didn't check...lol.
ah yes the hands of the LS Swap god at work
I love this guy! Built my first ls swapped project with just your info on your site about 5yrs ago and you kick ass man glad u have videos now 💪🤙
I’m up now learning lol!
Amazingly detailed and informative. Thank you for talking through and demonstrating the modifications!
Used the pinout sheet you made for the 1999-2002 harness yesterday, thanks so much for the info!!
Thanks for my programming man my truck runs great Lt1 swapped S10 Sonoma. Looking forward to some more of your services with my ls swaps 💪💪💪
Best most informative, detailed and to the point ls wiring video on the tube! Thank you sir for taking ypur time to do this video and share it with us.
Followed your guide and wow it was simple at first it didnt make sense to my brain but I trusted the process and an hour later I'm almost done and cleaning it up. Thanks
I've been referencing your site for years and never noticed the youtube links or vids. Great stuff. Great resource!!! Thanks.
Thank you for the videos. I was shown using a seam ripper from a fabric store to cut through tape or braiding on a wiring harness works wonders.
This is great!!! I'm doing a 5.3 LS 4L60E 2WD swap to a '84 ElCamino using a '03 5.3 LS with DBW. These vids are going to make the job a shit ton easier. I can pretty much follow along bieng in "real time" . I've used his info in the past and it is Rock Solid!!! Thanx again Brendan
Man your smart! I was going to have someone do this for my '88 MCSS gbody LS swap cause I hate wiring but long as I have the harness and wire chart I should be okay? I'm running a LS1 with 4L60E and using all my stock gauges, the car will look 100% original until you pop the hood. Thank you for the inspiration
Everytime I get to watch this video I just can't stop watching finally someone who explain step by step and doing things at the same time and I have a ? Do you do this for any person if so let me know thanks
is this much different than a 6.0 drive by wire set up?
Kevin Camacho I’m in here for the same reasons
Thanks for the post, 3 questions for clarification regarding the pin outs. I'm swapping using T5 manual trans. Do I need Tcc brake signal? Since it will be a manual trans I assume I can remove all automatic trans wiring even if not highlighted? What can you recomend for vss sensor on T5? Thanks
What a great service you have given the LS swap community. I just recently bought a 92 camaro I am doing a ground up resto Every is using your info for the wiring harness!!! Thank you!!!! Check out my build.
Best most helpful youtube video ever created.
Thank you again. This is the best video that I have seen on this. You are the man!
Hi...thanks for the great videos....if I was going to use a th400 instead of the stock 4l60e with ls1, which pi s do I remove out of the harness...my motor and harness is out of 2002 Corvette. Thank you
I got a 5.3l vortec from a 2001 chevy 1500.
That's the LS based model, just wondering if this is the exact same thing? Or is the LT and LS different? I don't wanna screw anything up. Please let me know.
I have a '05 L33 5.3 aluminum block high output truck engine and it has all the wiring for the duel tank set-up. My question, can I use the PCM signal wirefor the duel tanks for my second fuel pump in my Miata swap. Does the PCM signal run the pump all the time or is it switched by the operator to go over to secondary tanks when needed. Thx.
I noticed on your chart in connector C1 that pin 56 is not labeled. The print that I have is labeled yellow. Thanks for the great work.
Excellent video! Thank you for all the information you share helped me a ton during my swap.
so is this for a swap that will keep the stock LS computer , intake and fuel injection system?
Question the pin. 33 the ppl wire that runs the tcc lock up. It's still in my black c2 connector on the factory fuse box that I'm using. When I wire up the brake switch the ppl wire to tap into that wire? Or do I take it out of the black connector?
on the LS1 Vega shown on You tube by marc Ramos,did you ever find out what motor mounts,headers and oil pan he used ? I have a 1975 that I plan to put a 6.0 in it.
Can I remove all of the wires labeled “(A/T)” on the chart if I am running a drive by wire manual transmission setup?
Does this also work for a 2005 chevy Silverado it has a electric throttle body and gas pedal first time doing this help much needed
Yes
At the end says cruise control totally optional. O think like 3 wires. If you don’t want it do you just pull it out like the other unnecessary wires?
I just picked up an engine 6.0 L9 block with a 6L90 transmission where can I get the harness modified for my 1981 Chevy Monte Carlos.
Thanks for the video and your online content. I looked through your site and I may have missed it, but I can’t seem to find anything on a manual transmission like a T-56. Or does the ECU not interact with a manual transmission? 2007 6.0 btw.
For clarity sake, this entire process is intended to remove wire bulk correct? Or does it serve a functional purpose?
Hi I'm putting a 2006 Silverado ls swap in my c10. the question I have for you is when removing the stock harness to the truck will the DBW pedal wire be in the moter harness? I bought a donor truck and im striping it for the motor I was hoping that the pedal wire will connect to the motor harness not the cab side harness? thankyou for these great videos and you time to read this and help me
Could you please answer this question everything in this video what you have on your two sheets that is highlighted in yellow and blue is that what gets eliminated from the harness
I’m putting a 5.3 with 4l60e on a small lawn tractor nickname “Death Tractor”
Thank you for the videos. Im swapping a 2001 5.3 dbw and when i cut all the wires but pinks out of the fuse block i have about 4 wires hanging loose from my tac module plug what to i do with those? Are they needed? If so where do i run them?.any info or direction is much appreciated.
I have a 6 litre engine 2005, and I want to put it in a 1987 GMC Sierra. How would I go about this?
Why did you skip doing anything with Pin BLUE 35 (CPP switch signal)? It's marked in blue, was that a mistake?
Question. When your adding pins to say where the fan goes why not just reuse one of the other wires you've already taken out instead of making a entire new wire? Is that ok to do?
Does the fan wire u saved have to go to relay or can it go directly to fan
Relay
This is super useful info, thanks man, this must have been tedious to record etc.
question towards the factory sarvc plug wires, looking for the location to the blue wire. did a rewire and cant find a location. its in a stock factory truck. any help is appreciated
I'm going to ask a dumb question. Why can't I use the entire harness minus the gauge and climate stuff? I got all the fuse blocks and relay box. If I just tape off what I don't use would that work?
Can I use this video to ls swap my 93 Silverado 1500
The Blue wire on a 03 flex fuel harness from the Alternator you can use it for your aftermarket tech anh it works 👍
I was wondering do you do the harness also with flashing the pcm can I send my harness and pcm to you ?
curious about this as well
@@chriskingery3555 also curious about this.
VERY educational, simple but "involved" you mention 03 "up" there is no AC control through computer, did I hear wrong? I am doing a 04 LQ9 in my running but rusty 3500 Van (with AC) and swapping into 83 camaro with AC. Your information and amazing sharing is truly a selfless act. THANKS!
The physical a/c request wire can be turned on in the PCM. Only PCM's that support mechanical throttle (DBC) have the necessary circuit inside the computer for this to work. 03+ pickups a/c request is a data signal over the data bus. 03+ vans used a physical wire, 12V+ signal into the computer to request ac.
I have an 03 Express van harness and relay box is it the same keyed power c1-a9 as the truck relay box to power up everything???
You guys know, if I can I put a 2011 5.3 Silverado harness in a 2008 tahoe 5.3 block and transmission with a 4L60E?
Would it be possible or difficult to add flexfuel to a swap? I'm stuck in the 70's and looking to make the leap to the 21'st century! The newest vehicle I owned was a 92, Chevy truck, I swapped in a 454, I just bought a 96 S15, I want to swap in a 05 or so 4.8L. Engine and trans, or would the v6 4L60 be OK? I'm thinking just swap the engine and trans, with standalone ECU TCM, I guess connecting the stock harness for the gauges would work?
Thanks Brandon for the video. Always great info
The tan wires that go to the from 02 sensors to pcm. Do they need to be case grounded also even though they go to pins 26&29 on the blue connector? It’s an 03 harness and pcm just like that one.
The purple started solenoid wire... would I run an extra relay for the starter? I don't see a starter relay in your custom fusebox walkthrough on the website
The wires that go to fuel injector can u splice to make longer or do i need to replace whole wire to make longer
Thank you for creating this amazing resource! I am in the middle a swapping a Gen III 5.3 w/ 4L60E. I am in the research phase attempting to determine how much functionality I can retain. One thing I have asked in multiple forums is regarding the instrument cluster but haven't found anything useful. is it possible to keep the donor vehicle's instrument panel cluster?
Yes im using the oe sensors and runing paralell
So if we are not using the auto trans do we just eliminate everything associated with the a/t
I’m missing one of the blue plastic covers for the PCM connectors. Any idea where I could get one?
your choice of cold snack sparks joy.
P.S....My 4L60 is already wired up in OEM Harness. Not to sure what the Computer will think of my 231C manual shift Transfer Case(I did put the speed sensor in it).
I got my 6.0 out of a 2004 Chevy express 3500 and my wiring harness is different in a couple of days from any type or rework diagram you have shown on your website or that I've found period on the web or TH-cam for that matter..
There was a few pinouts that we're different
hello how are you plz i have hummer h3 2006 v5 3.5 l with E40 ECM if i find v8 gn4 with E67 Ecm and harness i can put it on my h3 and work properly all gauges and ABS and traction control? and transmission sure i wanna make changes in th. 4l60 to v8 ... o r other E C M?
I am working on a swap on my gmc 98 5.7 vortec to lq9
My interiors will be swaped too to nbs , for my ac wiring can i use my old harness or i must do an initial wiring for each pin..ill be happy to hear back from you ...
When adding wires for fans or even nakimg extensions for suctom harnesses, where do you get your wire? I have a couple PCMS where the yard hacked the wires at the connectors and would like to rebuild those harnesses with the correct color coded wires.
go to the junkyard and pull a unmolested harness that harness is done dont use the hacked harness
I’m using a 2001 5.3 for my swap and converting to DBC. Can you link me to the wiring and removing of the TAC and cruise control? I saw someone on here had the same question but it was for a 03-07 and the link said it was strictly for that not 99-02.
At 48:57, referring to the cruise control wiring. I have an ‘03 lq4 and 4l80e van harness that is drive by cable. I have all the wires from the fuse block identified except for two pink wires and two dark green wires that both run to the top connector on the park/neutral safety module. Would these wires be for my cruise?
How much do you charge to do a Stan alone harness I have a 98 c1500 with a 4.3 going to put a 5.3 out of a Yukon xl 1500
It appears that this method is for swaps in older vehicles. Im putting an LM4 into a 99 firebird. Am I correct to assume my harness would be different?
In that situation, I would find a v8 harness for a 99 f-body and it would plug in. This method could still be used to get the LM4 running, then all you have to connect between the LM4 harness and the 99 are wires for stuff like check engine, fan controls, data wires, key hot signal. The fuse block on a f-body was part of the forward lamp harness, so all the powers needed will be found in the C100, C105 connectors on the passenger inner fender and kick panel area.
@@LT1SWAPCOM awesome! Thank you!
Question for you do you rework harnesses for individuals and what would you charge more or less
Hello. I went to start my dad's 1967 Olds Cutlass with 4.8LS (Engine from 2003 Chevy Silverado) Conversion and smelled fuel, I luckily had the exhaust and headers separated.
I saw fuel spraying out of the passenger side of the header. I Swapped injectors for Cylinder #4 & #6 after smelling fuel on the plugs. I restarted the engine and the fuel still leaked unburned raw fuel.
Any Ideas on how I should fix?
Do i have to have the harness that came with the motor or can i use one from another motor but same Year
no you do not. I am using a random harness for engine as long as it's from the same time period like 1999-2002 or 2003-2007.
I bro I have a question on 07-13 harness Looking for color wiring fuel pump cus I swap from v6 to v8 and I don’t have power to fuel pump
Im 20p3 5.3 ls swaping in to a 1095 GMC 3500 dulley that had a 6.5 turbo desoil in it so my swap a lil more than just wireing
But does your page have a wire schematics for a 1995 GMC 3500 C in the vin because i want to wire the 6.5 i pulled out in my boat 😆 and drop 5.3 ls in the 95 gmc 3500 dulley 😆
Is it the same process for the harness of an 01 lq4 6.0?
hello sir .. i depind TAC power supply (pink from Tac blag ) i want to add it back , in which pin goes in the TAC Blag?
I might be insane. but my 2000 Blazer has most of Sensors for LS.I need injector, coil pack.cam pos. sensor, knock sensor,and second cat sensor. I might need longer leads for alternator. I am considering a "mini harness" to travel with my OEM harness. At plug's I could re-pin to Trailblazer SS locations. I know this might sound crazy, but I think it might work out well. I would appreciate the opinion of the Master. Thanks for all You do.
Hello do you have any info on making an ls harness plug n play to a lt1 firewall bulk head? i have a 95 firebird i am swapping thanks.
Question: I have the exact harness as what's in the video. My swap will be DBC, so my question is... can I remove the TAC module plug and all it's wires? I'm not doing cruise control either.
YES if using DBC, you can remove TAC module, throttle body plug, and two UART data wires from TAC to the PCM. You will have to add TPS, IAC wiring.
www.lt1swap.com/cable_conversion.htm
Great videos by the way ! Do you flash ecu ‘s and how much do you charge ?
I sure do, www.lt1swap.com/programming.htm
LT1 thanks for your videos, I am about to rework a 2002 ls 5.3 using your chart. I am putting it in a 95 mustang With a turbo. On the website it says that "if you will need to use 4 oxygen sensors or Evap system that you should hot remove them". From yours and other videos I understand how to remove the pins and work the wires out, I just don't know exactly which wires to remove. Could you please help? I have posted on other sites with no reply.
Thank you,
Brad
Hey whats up i don't know if it's just me or im missing it but i can't find the schematics on the wiring harness for a 2005 chevy suburban just picked it up 2005 rwd 5.3 thanks in advance
Thank you for all your information on wiring harnesses makes doing the engine swaps easy I'm now working on a Chevy Cobalt SS supercharged 2 L do you have any videos on that or pinout and can you do the computer if I send it to you I'm putting it in a Baja Bug thanks again for all the information you give us
I got two harnesses, a 2001 and a 2003, both with no tach module electric throttle control. What I do?
Where can I get a copy to print the paper your using to remove the pins / wiring
www.lt1swap.com/1999-02pcmpinouts.pdf
www.lt1swap.com/2003-07pcmpinouts.pdf
at 22:01 you mentioned that you are pulling out Oil pressure low reference Blue 63 and Blue 7 (5 volt low reference). Just wondering if this later has to be coded out so it does not send a MIL??..does PCM require to see any oil pressure signals. Thanks.
Yes the PCM should be programmed to disable diagnostics. Any programming I do, I disable the diagnostic for the oil sending unit. Even disabled, you can still keep the sensor wired up and view oil pressure on a scan tool (2003+ only) The PCM does not have any oil pressure related safety shut down of any kind, its sole purpose was to send the oil pressure information to the instrument cluster over the data bus. You can keep this sending unit if you plan to use a factory instrument cluster, or a Dakota Digital unit with the OBD2 adapter.
What can I say, you just keep giving, and we all thank you! Always great help and advice from you Brandon.
with the original fusebox can i run it like that only with the c2 conector?
Now those wires that go deeper in the harness, what do you do with them????
On the blue Connector you miss pin 35 gry wire cpp switch signal (mt ) I'm working on 03 hardness .
What would I do with the removed wires if I didnt mind keeping the fuse block in the engine bay? Just unpin them from the connector?
I'd also like to know because my Bay is big enough for my Tahoe's original box and I dont mind keeping it
Thanks a lot! you just saved me $800 if i did it right lol
i have an ls1 motor wiring harness any clue where i could find pin outs for my engine ? any help is appreciated thanks !
Have been following you videos and its been very informative. Swapping 03 Yukon 5.3 into 69 Camaro. Stumbling block that I'm having is the Neutral Safety switch. After you cut the wires from the C2 block where do they go? If you got a minute. Also are you still flashing ECU's ?
Did he answer???? Hod did udid?
No I didn't get an answer. When to his website LT1swap.com
I did send my PCM to him and he did flashed it.
@@AlienRestoMod @ how much charge?
@@AlienRestoMod @ what did u ended doing with safety switch???
Do you have a video on a 2007 gen IV 5.3ltr loom??
Is this a dbw harness because that’s what I have it’s a 2005 5.3 out of a suburban
respect
Will the engine start even if my ecm hasn’t gotten Vats deleted ???
Is there lots of differences between this harness and the one for 99-02?
Do you have info on reworking a gen 4 e38 harness from a van?
Will this work on a 2004 vortec 5.3l