Electrochromic Compass/Temperature Mirror With Lights

The optional self-dimming Electrochromic Compass/Temperature Mirror has a vacuum fluorescent (VF) display that is integrated into the rear view mirror. The Compass/Temp Mirror includes the compass/temperature display and two map/ reading lamps. This display provides the outside temperature and one of eight compass headings to indicate the direction the vehicle is facing. The Compass/Temp Mirror displays the compass heading and the outside temperature at the same time. The Ambient Temperature Sensor monitors the outside temperature and is hardwired to the Compass/Temp Mirror.

BUTTON OPERATION
The Compass/Temp Mirror incorporates 3 (mode/ lamp) buttons to access and control various functions.

Left Button
- Press and Release
- Toggles Left Map Light On/Off
- Press w/Right Switch for more than 5 seconds and Release
- Toggles Electrochromic Status On/Off-automatic On with each ignition cycle
- On mode is indicated by green status LED next to right button

Center Button
- Press for more than 3 seconds and Release
- Cycle through display status
- Compass / Temperature (Fahrenheit) - °F mode stored to memory
- Compass / Temperature (Celsius) - °C mode stored to memory
- Display Off - off mode stored to memory
- Press and Hold for 3-6 seconds
- Activate zone variance mode (adjust compass for true north)
- "Z" and the currently programmed zone (1-15) will flash in display window
- Each press of the center button will increment to the next zone
- When proper zone is selected, wait 5 seconds and mirror display returns to comp/temp (see variance zone map for proper zone number setting)
- Press and Hold for more than 6 seconds
- Activate compass calibration
- "CAL" shows in display window until compass is calibrated (verify correct variance zone prior to initial or re-calibration)
- Drive vehicle in a slow circle for 1.5 revolutions to recalibrate compass

Right Button
- Press and Release
- Toggles Right Map Light On/Off

ELECTROCHROMIC (EC) OPERATION (auto dimming feature)
The automatic dimming feature detects forward and rear light conditions and adjusts the reflectance level of the mirror to eliminate unwanted glare by the use 2 photoelectric sensors. The feature can be disabled by depressing the Left and Right buttons together for more than 5 seconds. The disable command will only remain in effect until the ignition is turned off. The EC function will automatically return to ON with each ignition cycle.

When the forward sensor detects daytime conditions, the rear sensor is inactive and the mirror remains in a high reflectance state.

When nighttime conditions are sensed by the forward sensor, the rear facing sensor is active and detects glare from rearward approaching vehicles or other glare producing light sources. The mirror will automatically adjust to a low reflectance state to remove the unwanted glare from the inside rear view mirror. The mirror will automatically return to a high reflectance state whenever the vehicle is placed in REVERSE to ensure a clear view when backing up.

NOTE: Do not allow the forward or rear sensors to be obstructed since this may impair proper performance.

ELECTROCHROMIC (EC) DIAGNOSTICS
Ensure that both the forward and rear sensors are not obstructed by hang items, tape, stickers, window decals, etc.

1. With the ignition in the ON position:
Use a flashlight or other light source, to illuminate the forward facing sensor. The mirror should remain/adjust to a high reflectance state. This simulates daytime conditions. Cover the forward facing sensor with a finger or dark material. Using a flashlight or other light source, illuminate the rear-facing sensor. The mirror should dim to a low reflectance state. This simulates nighttime glare conditions. Cover the forward and rear facing sensors with fingers or dark material. The mirror should remain/adjust to a high reflectance state. This simulates nighttime non-glare conditions.
2. With the ignition in the ON position, the BRAKE applied and the vehicle in REVERSE:
Cover the forward facing sensor with a finger or dark material. Using a flashlight or other light source, illuminate the rear-facing sensor. The mirror should remain in a high reflectance state. This simulates nighttime driving conditions, providing a clear view while backing up. If the EC Comp/Temp Mirror does not respond as indicated, replace the EC Comp/Temp Mirror in accordance with the Service Information.

COMPASS OPERATION
The compass is capable of distinguishing 8 primary directions: N, NE, E, SE, S, SW, W, NW. This electronic compass is designed to display readings relative to True North. All compasses measure readings relative to Magnetic North. The difference between Magnetic North and True North varies from place to place across the surface of the earth. Therefore, the compass must be told approximately where it is on the earth's surface so that the Magnetic North reading can be properly converted into a True North Display. This is done by separating different parts of the earth into numbered "Zone Variances" (see zone variance map). The Zone Variance in which the compass is to function must be entered into the compass.

FIRST TIME / MANUAL CALIBRATION
Set or confirm the Zone Variance, refer to COMPASS ZONE VARIANCE. During first time or manual calibration, the compass may already be calibrated (CAL is not displayed). It is recommended that the CAL mode be invoked under all situations. With the ignition in the ON position, pressing and holding the CENTER button for more than 6 seconds will toggle the display to CAL. Releasing the button after the 6 second duration will enter the compass into the calibration mode. CAL will remain illuminated until the calibration is complete. Move the vehicle to an area away from large metallic objects or overhead power lines. While CAL is illuminated in the display the vehicle must be driven in at least 1 complete 360° circle at less than 5 MPH (8 KPH). Up to 3 complete 360° circles may be required. The compass will calibrate; CAL will turn off, and the compass will resume normal operation.

COMPASS ZONE VARIANCE (adjust compass for true north)
The compass has a default zone of 8. Refer to the Zone Variance Map to determine the correct zone number. The correct compass Zone selection is critical to proper compass operation. With the ignition in the ON position, pressing the CENTER button for 3-6 seconds and then releasing while "Z" is illuminated enters the compass into the Zone display mode. In the Zone display mode, "Z" will be illuminated instead of the temperature. The current 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 calibration to adjust for gradual changes in the vehicle's magnetic remnant field. If the vehicle is subjected 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 COMPASS ZONE VARIANCE and manually recalibrate per MANUAL CALIBRATION. The electronic compass, 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 module memory temperature data to accurately display the outside temperature and to avoid "hot soak" condition readings. The displayed outside temperature 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 temperature 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 intermittently 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
The ambient temperature sensor is a variable resistor that operates on a 5-volt reference signal circuit hardwired to the Compass/Temp Mirror. The outside air temperature is monitored and displayed by the Compass/Temp Mirror.

The ambient temperature sensor cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.

The resistance in the ambient temperature sensor changes as the outside temperature rises or falls. The Compass/Temp Mirror senses the change in reference voltage through the ambient temperature sensor resistor. Based on the resistance of the ambient temperature sensor, the Compass/Temp Mirror module is programmed to correspond to a specific temperature. The Compass/Temp Mirror then displays the corresponding outside temperature received from the sensor.

AMBIENT TEMPERATURE SENSOR DIAGNOSTICS
The outside temperature function is supported by the ambient temperature sensor, a signal and ground circuit hardwired to the compass/temp module, and the Compass/Temp Mirror display.

If the Compass/Temp Mirror display indicates "SC", the ambient temperature sensor circuit is shorted to ground.

If the Compass/Temp Mirror display indicates "OC", the ambient temperature sensor circuit is open.

The ambient temperature sensor can be diagnosed using the following Sensor Test. First, confirm that °C is not being mistaken for °F or vise-versa. If the ambient temperature sensor and the circuits are confirmed to be OK, but the temperature display is inoperative or incorrect, replace the Compass/Temp Mirror.

AMBIENT TEMPERATURE SENSOR TEST
1. Turn the ignition OFF.
2. Disconnect and isolate the battery negative cable.
3. Disconnect the ambient temperature sensor harness connector.
4. Measure the resistance of the ambient temperature sensor using the following values:
- 0°C (32°F) Sensor Resistance = 29.33 - 35.99 Kilohms
- 10°C (50°F) Sensor Resistance =17.99-21.81 Kilohms
- 20°C (68°F) Sensor Resistance = 11.37 -13.61 Kilohms
- 25°C (77°F) Sensor Resistance = 9.12 - 10.86 Kilohms
- 30°C (86°F) Sensor Resistance = 7.37 - 8.75 Kilohms
- 40°C (104°F) Sensor Resistance = 4.90 - 5.75 Kilohms

The sensor resistance should read between these min/max values. If the resistance value is OK, refer to the Wiring Diagrams to test the Signal and Ground circuits. If the resistance values are not OK, replace the Sensor.

MAP/READING LAMP OPERATION
The Map/Reading lamp feature uses LED (light emitting diode) technology as its light source. The driver and passenger map lamps each consist of 6 LED's, 2 blue-green and 4 amber. By mixing these colors through the use of a diffusing cover the output light is white in appearance. Direct viewing of the LED's will appear as blue-green and amber. The lights are activated by the door switch when entering or exiting the vehicle or manually by using the appropriate button on the mirror as described above. LED's last 10-15+ years and are not designed to be replaced in this application.