HVAC - Outside Temperature Indicator Logic

SOURCE:
Honda Service News February 2003

TITLE:
Outside Temperature Indicator Logic

APPLIES TO:
2003 Accord EXs with leather and 2003 Accord EX V6s

SERVICE TIP
The outside temperature indicator keeps bogus readings to a minimum by delaying the refreshing of the display until you're driving the vehicle faster than 19 mph, and by limiting the display change rate. Here's how the logic works:

When you turn the ignition switch to ON (II):

-If the engine coolant temperature is less than 60�C (140�F), the display shows the current outside air temperature.

-If the engine coolant temperature is greater than 60�C (140�F), the display shows the temperature that was stored in memory when you turned the switch to LOCK (0).

The display doesn't refresh from this reading until you drive the vehicle faster than 19 mph for at least 90 seconds. Once this criteria is met:

- If the measured outside air temperature is
greater than the displayed temperature, the displayed temperature rises 1�C per minute (about 1.8�F) until the two temperatures match.

- If the measured outside air temperature is less than the displayed temperature, the displayed temperature drops to match the measured outside air temperature after about 20 seconds.

If you need to calibrate the outside temperature indicator, look at Outside Air Temperature Indicator Test refer to page 22-240 of the 2003 Accord S/M.