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Thread: Question about thinning my obs harness

  1. #1

    Question about thinning my obs harness

    I am buying a pre made harness for My 5.3 swap and I want to keep my abs so I know I have to keep my obs ecu. Is there a write up on thinning the obs harness of what I don't need? All I can find when searching is to remove what you don't need. That doesn't help much...
    98 Tahoe 4WD. 2002 5.3L LS swap.. Lowered on shackles and keys. 22" Escalade rims with custom SS centercaps, 2 tone red and gunmetal paint with silver pinstripe.SS front bumper cover.Rear roll pan. Street scene mesh grille inserts.debadged and demoulded.6K HIDs and hidden yellow fogs.Billet bowtie.K&N intake system. Flexalite Efans.Dual optima batteries. Pacesetter shorties High Flow cats. Flowmaster muffler with single exit exhaust. Escalade Seats and console. SS headrests. Remote Twin turbo build in progress!!!

  2. #2
    Join Date
    Aug 2013
    Posts
    28
    Quote Originally Posted by 2drhoe View Post
    I am buying a pre made harness for My 5.3 swap and I want to keep my abs so I know I have to keep my obs ecu. Is there a write up on thinning the obs harness of what I don't need? All I can find when searching is to remove what you don't need. That doesn't help much...
    What year is your obs I know for mine I just cut up everything from the passenger side computer behind glove box and just left stuff I needed like a/c switch wires and blower motor

  3. #3
    mine is a 1998 4wd tahoe 5.7
    so My Computer is behind the glove box? What is the big ECU looking box on my drivers fender well?
    98 Tahoe 4WD. 2002 5.3L LS swap.. Lowered on shackles and keys. 22" Escalade rims with custom SS centercaps, 2 tone red and gunmetal paint with silver pinstripe.SS front bumper cover.Rear roll pan. Street scene mesh grille inserts.debadged and demoulded.6K HIDs and hidden yellow fogs.Billet bowtie.K&N intake system. Flexalite Efans.Dual optima batteries. Pacesetter shorties High Flow cats. Flowmaster muffler with single exit exhaust. Escalade Seats and console. SS headrests. Remote Twin turbo build in progress!!!

  4. #4
    Join Date
    Mar 2013
    Location
    Long Beach California
    Posts
    637
    no. I'm pretty sure you have the 411 pcm which came with the 96+ vortec motors. I think they are mounted where you say which is where they mounted them for the lS motors motors as well. my 95 has the pcm behind the glove box.

  5. #5
    Join Date
    Sep 2009
    Location
    NE Ohio
    Posts
    211
    Quote Originally Posted by 2drhoe View Post
    I am buying a pre made harness for My 5.3 swap and I want to keep my abs so I know I have to keep my obs ecu. Is there a write up on thinning the obs harness of what I don't need? All I can find when searching is to remove what you don't need. That doesn't help much...
    You dont have to keep the OBS ECU for the ABS. It is independent from the PCM.
    Been lurking since 09 and I finally have my kickass 6.0 LQ4
    LQ4 LQ9 6.0L Engine Service Manual Save to your computer in case it disappears


  6. #6
    Join Date
    Jan 2014
    Posts
    3
    You don't have a 411 PCM in your 98. 96-98 had the black box computer on drivers side fenderwell. You can get a stand alone harness and run both your old and new computer or you can repin your harness into the 411 computer and do away with the black box. Just have to add 10 wires for coils, another for knock sensors, and cut your one big injector plug and wire 8 seperate injectors in.

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