unable to connect to 02/03 GMC sierra , connects ok to all other vehicles ive tried just hates my truck. I have version v43.80 currently installed using easy diag and Paid for GM coverage
If you ever encounter some NO communication issues with any vehicle make sure the accessory power supply fuse is good. Most vehicle will power the main DLC 16-pin connector with the accessories power outlet fuse.
Otherwise you can always try to communicate the the Generic Global EOBD2 software for powertrain emissions.
If you still cannot communicate then you may require to remove and uninstall this GM Version V43.80 and download a previous version.
Each pin will have have its assigned definition. Assignment of many of the pins is still left up to the manufacturer, but those pins are NOT meant to be used by the Generic OBD2 complaint control units. They can be used for SRS/RCM Air Bags, or ABS Anti-Lock Brake systems.
Just make sure to notice the connector has is own power and ground source; Pins 4 and 5 are ground and pin 16 is power. This is so that any scan tool wont require any external power source. If you plug in any scan tool and it doesnt respond, first check the pin# 16 for power and then check pins #4 and pin #5 for ground.
