Ambient Sensor
WARNING: This page is about a different car, the 2001 Isuzu VehiCROSS. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect ambient sensor. Using DVOM, measure resistance across specified terminals of ambient sensor. See Fig 1 . Using graph in illustration, compare resistance value with current ambient temperature. If resistance value is not near specified values, replace ambient sensor.