Diagnostic Aids
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Ambient Air Temperature Display Update
| Condition | Display |
|---|---|
| Using Scan Tool Special Function | Updates temperature display instantly |
| When the HVAC module MODE, FRONT DEFROST, and REAR DEFROST buttons are pressed simultaneously. | Updates temperature display instantly |
| At start up with the engine off less than 2 hours | Displays last stored temperature unless temperature has decreased. The outside air temperature reading is always instantly updated if ambient air temperature has decreased. |
| At start up with the engine off more than 2 hours | Displays actual outside temperature |
| Vehicle speed above 32 km/h (20 mph) for a minimum of 80 seconds | Updates temperature display at a slow filtered rate |
| Vehicle speed above 72 km/h (45 mph) | Displays actual outside temperature |
| Sensor ambient temperature reading is less than the last displayed value | Displays actual outside temperature |
| When the ambient air decreases | Updates temperature display rapidly |