Which two wires lead to IAT sensor for 05 gmc sierra 6.0

check the link

https://www.google.com/search?q=2011+%22gmc+sierra+1500%22+iat+sensor+location

and what they look like

https://www.google.com/search?q=2011+%22gmc+sierra+1500%22+iat+sensor

..

IAT is tan for signal, black for ground. Other wires are probably for the MAF.

black wire is the 5 volt reference from PCM to IAT. Tan is IAT data signal to PCM. See diagram below.

what do you mean by control? there is one wire normally pink or white with pink strip that is power 5 volts + black is ground and a reference voltage 5 volts ground is black or white so the other two colors would be the control wires going to the computer. However would need the first 8 numbers of the Vin to know for sure. you can also go to www.alldatadiy.com and purchase a subscription that will give you the exact information you need, they change color codes for wires from time to time and if you hook it up wrong you can destroy the computer so I suggest you purchase the subscription to be sure.

Might be part of the mass airflow sensor assembly, all one piece.

IAC-passenger side of throttle body.IAT-located in the plastic intake duct directly after the air cleaner and before the throttle body.
hope this helps?

Yes. most of the time, these types of sensor are potentiometers = have variable resistance depending where the sensor is ready. if you are able to hook up a volt meter to the sensor and see the ranges match up with the old one, then the should be compatible...same as with gas tank sending units

Hope link's description below helps.
http://wiki.answers.com/Q/Where_is_the_IAT_sensor_at

P0113-Intake Air Temperature (IAT) Sensor Circuit High Voltage

P1111-Intake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage

I am unable to dig up any C code with that number.

Well, the IAT (Intake Air Temperature) sensor is located on the air intake duct between the filter and the throttle body (Assuming you have the 6L motor). The wires are easily visible at the plug that connects the sensor to the wiring harness. That's the easiest place to access them.