Does anybody have the correct pinouts for FICM, ECM, and fuse block for a 2002 lb7? I can only find the ones for 2003 and up. Chasing a crank no start and have narrowed it down to something electrical. pin 30 on my ignition relay is not hot key on or off and pin 86 87 on the same relay are always hot. Trying to back probe the harness and all connectors to hopefully find a short, Thanks.
2002 LB7 pinouts
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Free Service Manuals for 2002 Chevrolet vehicles | Operation CHARM
Detailed repair/service/workshop manuals for many 2002 Chevrolet vehicles, including electrical diagrams, recommended bolt torques, and estimated labor times.
charm.li
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@Ron Nielson that link is a gold mine
I’ll be back out there later I’ll let you guys know what I find.
I’ll be back out there later I’ll let you guys know what I find.Update on what I’ve found, fuse block tested bad ordered a new one( used on eBay) and it was also bad so waiting on another one. Stumbled across the main battery negative cables showing 12 volts to ground when disconnected from battery. Eventually found that when taking of the red feed wire from the top right stud of the fuse block that leads to the cab, voltage went away and cables were ground again. After a lot of tracing and unplugging, found that my electronic brake controller was causing this weird 12 volts backfeed to ground cable and this purple connector for the BCM was heavily corroded.
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The controller back by the spare tire? That one has been known to get water in it and do as you describe
Can somebody please tell me if the relay pins for ignition1 relay is switched making pin 87 constant feed and pin 30 is the output instead of 30 being the input and 87 is the output on a 2002 lb7. After getting yet another block I am getting the same readings I doubt I got this many bad blocks in a row