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GENERAL INFORMATION
illuminated instead of the temperature. The cur-
rent Zone number, 1 through 15 will be displayed.
While Z is illuminated; momentarily pressing the
CENTER button advances the zone to the next
higher zone. When the desired zone number is
displayed, do not press the button again. After 5
seconds, the Zone Variance number will be stored in
the module memory.
On long trips, a vehicle may leave its original
zone and enter one or more new zones. Generally, if
no more that 3 or 4 zones are temporarily traversed,
there is now reason to reset the Zone Variance. Only
a permanent relocation of the vehicle to a new zone
is reason enough to reset the Zone Variance. Each
zone is magnetically about 4.2° wide. Until a total
nearing 22.5° is accumulated by traversing zones,
the typical driver will not notice any difference on
the display. Beyond 22.5°, a reading may be off by
one or more primary directions.
CONTINUOUS CALIBRATION
During normal operation, the EC Comp/Temp
Mirror will continuously update the compass cali-
bration to adjust for gradual changes in the vehi-
cle's magnetic remnant field. If the vehicle is sub-
jected to high magnetic influences, the compass
may appear to indicate false headings, locked or
appear unable to be calibrated. If this occurs, refer
to MANUAL CALIBRATION.
COMPASS DIAGNOSTICS
If at any time the compass continually displays
the incorrect direction, the reading is erratic or
locked, verify the correct zone variance per COM-
PASS ZONE VARIANCE and manually recalibrate
per MANUAL CALIBRATION. The electronic com-
pass, although highly protected from changes in
magnetic field, can be susceptible to large changes
in magnetic field. Examples include, but not limited
to: high tension power lines, large steel buildings,
automatic car washes, large quantities of scrap
metal, etc. While occurrence of this phenomenon is
infrequent, it is possible.
OUTSIDE TEMPERATURE OPERATION
The EC Comp/Temp Mirror utilizes internal mod-
ule memory temperature data to accurately display
the outside temperature and to avoid hot soak
condition readings. The displayed outside tempera-
ture information is stored within the memory of the
EC Comp/Temp Mirror. The temperature memory
only sets after the EC Comp/Temp Mirror has been
on for 5 continuous minutes. When the EC Comp/
Temp Mirror is first powered up, it retrieves the
temperature data from the module memory. With
the memory set when the EC Comp/Temp Mirror is
powered up, the last temperature stored will be
displayed and the module enters the Slow Update
mode, (Slow Update = 1° increase or decrease per
minute.) With the memory not set when powered
up, the EC Comp/Temp Mirror will enter Fast
Update mode for 5 minutes and then enter Slow
Update mode, (Fast Update = Sample and display
the outside air temperature every 2 seconds.)
•
TEMPERATURE UPDATE - WARM
On power up, when the outside temperature
sensed by the ambient temperature sensor is
warmer than the temperature stored in the module
memory, the EC Comp/Temp Mirror will update the
displayed temperature in relation to the current
Update rate.
•
TEMPERATURE UPDATE - COLD
On power up, when the outside air temperature
sensed by the ambient temperature sensor is colder
than the stored memory temperature, the EC
Comp/Temp Mirror will update the displayed tem-
perature to the outside temperature at a rate of -1°
every 2 seconds.
•
POTENTIAL ICE CONDITIONS
If the measured outside temperature is 3°C
(37°F) or less, the temperature display will inter-
mittently read the word ICE to indicate possible
hazardous driving conditions. The alternating
ICE display will end approximately 2 minutes
after initial detection of approximately 3°C (37°F).
•
EXTREME TEMPERATURE / OPEN OR
SHORT CONDITION
If the measured outside temperature is more
than 60°C (140°F) or the ambient temperature
sensor sense circuit is shorted to ground, the temp
display will be SC to indicate a short circuit
condition.
If the measured outside temperature is less than
-45°C (-49°F) or the ambient temperature sensor
sense circuit is open, the temp display will be OC
to indicate an open circuit condition.
AMBIENT TEMPERATURE SENSOR
DESCRIPTION
The ambient temperature sensor is a variable
resistor that operates on a 5-volt reference signal
circuit hardwired to the Compass/Temp Mirror. The
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