Free online wiring diagrams - Silverado Sierra Free online wiring diagrams. Chevy Truck Forum | Silverado Sierra GMC Truck Forums. Free online wiring diagrams. Jan looking through every diagram till you find Does anyone have a wiring schematic with ecm pinout to share for 92 siverado with 7.4 auto 4x4 k3500 using ecm #1614060 axrd the 1227730 is everywhere but I cannot find Overall Electrical Wiring Diagram (2005) 4 - AutoZone AutoZone Repair Guide for your Wiring Diagrams Overall Electrical Wiring Diagram (2005) Overall Electrical Wiring Diagram (2005) 4 Powertrain Control Module (PCM) Repair Guide - AutoZone AutoZone Repair Guide for your Engine Performance & Emission Controls Connector Pin Identification Powertrain Control Module (pcm) The Silerado (T) 5 PCM wiring diagrams, and it keeps I'm trying to access the Silerado (T) 5 PCM wiring diagrams, and it keeps coming up with the 4 sheets. If I go to - Answered by a verified Chevy Mechanic GM Silverado data bus communication started in 2003 and 2003 Chevy Silverado DLC Diagram Description: Pin 2 is the circuit main data bus wire link. It's like the communication "messenger" between all the modules used in the vehicle. Both ECM and BCM are connected together by red wire making these 2 modules a two-wire connection.