outside temp gauge logic

[jctatman]

ServiceNews



September 2002




Outside Temperature Indicator Logic: ’03 Pilot EX

If you’re getting complaints from owners of ’03 Pilot EXs that the outside temperature indicator doesn’t read accurately, you may just need to explain how the logic works.

The temperature sensor for the indicator is mounted behind the front bumper. Because of this, the temperature reading can be affected by heat reflection from the road, engine heat, and even exhaust from surrounding traffic. To prevent bogus readings, the display uses a specific logic. Here’s how it works.


CONDITIONS LOGIC


The outside air is warmer than when the ignition switch was turned off [ACC (1) or LOCK (0)]





The outside air is cooler than when the ignition switch was turned off [ACC (1) or LOCK (0)]





• If the ignition was turned off for less than 2 hours, the displayed temperature when you turn the ignition switch to ON (II) stays at the ignition-off temperature until the vehicle has gone faster than 18 mph for 30 seconds, then the display immediately updates to the measured outside air temperature.
• If the ignition switch was turned off for 2 hours or more, the displayed temperature when you turn the ignition switch to ON (II) rises 1 degree every minute until the measured outside air temperature is reached.

• If the ignition switch was turned off for less than 2 hours, the displayed temperature when you turn the ignition to ON (II) is the ignition-off temperature. The displayed temperature then drops 1 degree every 2 seconds until the reading matches the outside air temperature.
• If the ignition switch was turned off for 2 hours or more, the displayed temperature is the measured outside air temperature.



You can also force the indicator to display the measured temperature. Just turn the ignition switch to LOCK
(0), remove the No. 13 (7.5A) Starter Signal fuse from the driver’s under-dash fuse/relay box for 60 seconds, then reinstall it. Turn the ignition switch to ON (II), and you’re looking at the measured temperature. But don’t forget, when you pull the No. 13 fuse, you must do the idle learn procedure and initialize the driver’s window auto up/down feature.

[jctatman]

ignore the civic article!

[a2Pilot]

I've always figured the displayed temp was plus or minus a few degrees, and rarely right on!

[Titans Fan]

Interesting. Does anyone know what logic the automatic climate control system uses in determining what fan speed to use, vents to select, etc?