Red/Blue PCM WHA documentation

They go by many names, P01, P10, P12, P59, E38, VPW, '0411 etc.
indaweedz
Posts: 2
Joined: Fri Dec 26, 2025 1:18 pm
cars: C1500 w/ LQ9

Red/Blue PCM WHA documentation

Post by indaweedz »

Hello everyone,
I'm a long-time lurker and new member and wanted to kick off my first post with an idea that could benefit the community: complete documentation for a Red/Blue PCM Harness. This community has fantastic resources for schematics and pinouts for the P01 red/blue PCM on Gen 3 engines, I've noticed a gap in harness build documentation while building a harness on my personal vehicle. This may be something that has already been solved in the community, and I just haven't found it yet. Or, maybe I'm trying to solve a problem that others do not have.Image If so, please stop me now!

My proposal is to collaborate on an open-source resource that includes:
Formboard or Harness Build Drawings: Drawings with dimensions for laying out a conversion harness.
Connector and Terminal Part Numbers: A complete, vetted list of required connectors, terminals, seals, and other components common for swap/install.
I design and build custom harnesses professionally and am currently documenting my second GMT400 conversion harness. I would be happy to share my current work in progress as a foundation.

Potential Hurdles:

I do not have experience sharing open-source type documentation.
Component Variety: international availability, verifying correct part numbers for appx 100 line items. I'm still not complete with the fuse panel and C100 documentation.
Conversion Variations: Different swaps require different lengths and configuration, making a "one-size-fits-all" drawing difficult. There may be much discussion needed to solve this.
Time Crunch: I only have a rapidharness sub until about January 26, this is too big to build on a free plan.

Community Benefits:

Provide a standardized, high-quality reference for anyone building a conversion harness.
Help builders source the correct parts the first time, and speed up the build process.
Make harness builds attainable by more people, and start a platform that may expand to other configurations.

Thanks for taking the time to read, and for all the great work everyone has done here over the years.

Image
gametech
Posts: 16
Joined: Fri Jan 10, 2025 6:00 am

Re: Red/Blue PCM WHA documentation

Post by gametech »

The lt1swap website has just about all the documentation you could need on the wiring harnesses.
indaweedz
Posts: 2
Joined: Fri Dec 26, 2025 1:18 pm
cars: C1500 w/ LQ9

Re: Red/Blue PCM WHA documentation

Post by indaweedz »

The feedback is much appreciated!