Offroad Trailblazers and Envoys

Engine wiring harness questions, 2007 TB, 4.2

Breaker 1-9, anybody got a copy? Any discussion or mods relating to electrons and wires go here.

by adharding » Sun Apr 17, 2016 11:48 pm

Hey guys, I'm trying to plan a swap, pulling out my 4.2 and swapping in a 6.5 diesel from a silverado that I have as a complete parts truck, but was wondering how the electrical would be set up on this rig. is the ECM involved with the BCM? if I remove the entire stock 4.2 driveline, will the fun stuff inside such as the HVAC, power windows, and vehicle lighting still function properly? or are they interlaced so it wont run without the other? I'd like to be able to keep as many amenities as possible. suspension and everything else to accomodate for the swap is in progress of finding and upgrading.
07 Trailblazer, 33" trail digger m/t's, 3" suspension lift, Markmc spacers,3"body lift, bumper delete mod (for now), welded front disconnect, 6.5 duramax/nv4500/ SAS in the works
User avatar
Posts: 11
Joined: Sat Apr 02, 2016 8:23 pm
Location: Tijeras, New Mexico
Name: AD Harding
Vehicle Year: 2007
Vehicle: Chevrolet TrailBlazer
DriveTrain: 4WD

by v7guy » Mon Apr 18, 2016 3:38 am

the ECM/PCM is involved. With the 2002-2006 trucks the canbus was interchangeable on the I6 models. The v8 in 06 changed the canbus to the modern setup with serial data and in 07 it was changed in the I6 trucks.
build thread

All things in moderation, including moderation.
Some people never go crazy... what truly horrible lives they must lead
User avatar
Posts: 3712
Joined: Wed Mar 09, 2011 10:17 pm
Location: NY, long island
Name: Jason
Vehicle Year: 2004
Vehicle: Chevrolet TrailBlazer
DriveTrain: 4WD
Rank: Offroad Rated

by Jrgunn5150 » Tue Apr 19, 2016 7:52 pm

But, I'm wondering, why can't he independently wire everything? If I put 12v to my window motors, will they not run regardless?
User avatar
Posts: 1128
Joined: Fri Jan 09, 2015 1:49 pm
Location: Ionia, Michigan
Name: Jr.
Vehicle Year: 2006
Vehicle: Chevrolet TrailBlazer
DriveTrain: 4WD w/ G80
Rank: Trail Ready

Return to Electrical / Radios