anybody have the power assignments to the pins in the port? 2000 silverado

 

How does this look?





The OBD-II specification provides for a standarized hardware interface—the female 16-pin (2x8) J1962 connector. Unlike the OBD-I connector, which was sometimes found under the hood of the vehicle, the OBD-II connector is always located on the driver's side of the passenger compartment near the center console. SAE J1962 defines the pinout of the connector as:

1. -
2. Bus positive Line of SAE-J1850
3. -
4. Chassis ground
5. Signal ground
6. CAN high (ISO 15765-4 and SAE-J2234)
7. K line of ISO 9141-2 and ISO 14230-4
8. -
9. -
10. Bus negative Line of SAE-J1850
11. -
12. -
13. -
14. CAN low (ISO 15765-4 and SAE-J2234)
15. L line of ISO 9141-2 and ISO 14230-4
16. Battery voltage

The assignment of unspecified pins is left to the vehicle manufacturer's discretion.

 

Yup thats correct and pretty much covers the 3 protocols Your trucks uses SAE J1850 VPW (Variable Pulse Width Modulation)

Pin 2 - J1850 Bus+
Pin 4 - Chassis Ground
Pin 5 - Signal Ground
Pin 14 - CAN Low
Pin 16 - Battery Power

Pin 9 is the mystery pin witch is a UART line for seiral data...