This is probably a question for Ben, but ever since I swapped the LBZ into my 04, the Onstar diagnostics come back with "We were unable to successfully complete a diagnostic test. This issue may be caused by an aftermarket device plugged into your vehicle's diagnostic port". Initially, I thought maybe it was because I still had the 06 VIN in the ECM & TCM, but it didn't change after I put my trucks VIN in the ECM & TCM.
My next thought was lack of GMLAN to the VICM, but according to the schematics, the wiring of the 04 & 06/07 VICMs is IDENTICAL... Unless the schematics are wrong.
Does anyone have any thoughts?
My next thought was lack of GMLAN to the VICM, but according to the schematics, the wiring of the 04 & 06/07 VICMs is IDENTICAL... Unless the schematics are wrong.
Does anyone have any thoughts?
