[cdru]

The ambient air tempature sensor is just a thermister that is wired directly to the DIC. The black wire should go to ground while the light green/black wire should go to pin 10 at the DIC. I would first check for continuity between ground and the black wire at the sensor. Presuming that is good, check between the lt green/black wire at the sensor and pin 10. If that is good as well, then the problem probably lies with the DIC if you can get a resistance other then 0 or infinity from the sensor.

Both wires follow the same route to the passenger side pass through connector on the firewall. There is a connector between the windshield washer resevoir and the battery that has 3 cavities. This is the only connector for the two wires between the sensor and the firewall.

On the other side of the firewall, the ground wire makes a straight shot to the main ground point on the cross car beam in the passenger foot well. I don't know if this is easily accessable or not.

The lt green/black wire also has a connector in the passenger foot well. It's the main wiring block under there. This then snakes up to the DIC.

Hope this gives you enough information to trace the wires.