mirror system is a completely self-contained unit
that replaces the standard equipment inside rear
view mirror. This system will automatically change
the reflectance of the inside rear view mirror to pro-
tect the driver from the unwanted headlight glare of
trailing vehicles while driving at night. The auto-
matic

day/night

inside

mirror

receives

ignition

switched battery current through a fuse in the junc-
tion block, and will only operate when the ignition
switch is in the On position.

Contained within the mirror is a compass/temper-

ature display as well as two LED reading lamps.

The automatic day/night mirror sensitivity cannot

be repaired or adjusted. If any component of this unit
is inoperative or damaged, the entire automatic day/
night inside rear view mirror unit must be replaced.

OPERATION

The automatic day/night mirror is equipped with

three buttons: the left switch for the left LED lamp,
the right switch for the right side LED lamp and the
center switch for the compass/temperature function.
Pressing the left and right switch simultaneously will
turn the auto dim function on or off. A green light
next to the right button will indicate when the dim-
ming feature is activated. The mirror also senses the
backup lamp circuit, and will automatically disable
its self-dimming feature whenever the transmission
gear selector is in the Reverse position.

The compass/temperature display provides the out-

side temperature and one of eight compass headings.
Press and release the center button once within 3
seconds to display compass/temperature (Fahren-
heit). Press and release the center button twice
within 3 seconds to display compass/temperature
(Celsius). Press and release the center button three
times within 3 seconds to deactivate the feature.

A thin layer of electrochromatic material between

two pieces of conductive glass make up the face of
the mirror. Two photocell sensors are used to monitor
light levels and adjust the reflectance of the mirror.
The ambient photocell sensor faces forward, to detect
the outside light levels. The headlamp sensor is
located on the mirror housing just to the left of the
switch and facing rearward, to detect the light level
received at the rear window side of the mirror. When
the difference between the two light levels becomes
too great (the light level received at the rear of the
mirror is much higher than that at the front of the
mirror), the mirror begins to darken.

POWER SYSTEMS

8N - 1

DIAGNOSIS AND TESTING - AUTOMATIC
DAY/NIGHT MIRROR

For complete circuit diagrams, refer to the appro-

priate wiring information.

(1) Check for a blown fuse. If OK, go to Step 2. If

not OK, repair the shorted circuit or component as
required and replace the faulty fuse.

(2) Turn the ignition switch to the On position.

Check for battery voltage at the fuse. If OK, go to
Step 3. If not OK, repair the open circuit to the igni-
tion switch as required.

(3) Turn the ignition switch to the Off position.

Disconnect and isolate the battery negative cable.
Unplug the wire harness connector from the auto-
matic day/night mirror. Connect the battery negative
cable. Turn the ignition switch to the On position.
Check for battery voltage at the fused ignition switch
output (run/start) circuit cavity of the automatic day/
night mirror wire harness connector. If OK, go to
Step 4. If not OK, repair the open circuit as required.

(4) Turn the ignition switch to the Off position.

Disconnect and isolate the battery negative cable.
Check for continuity between the ground circuit cav-
ity of the automatic day/night mirror wire harness
connector and a good ground. There should be conti-
nuity. If OK, go to Step 5. If not OK, repair the cir-
cuit to ground as required.

(5) Connect the battery negative cable. Turn the

ignition switch to the On position. Set the parking
brake. Place the transmission gear selector lever in
the Reverse position. Check for battery voltage at the
backup lamp switch output circuit cavity of the auto-
matic day/night mirror wire harness connector. If
OK, go to Step 6. If not OK, repair the open circuit
as required.

(6) Turn the ignition switch to the Off position.

Disconnect the battery negative cable. Plug in the
automatic day/night mirror wire harness connector.
Connect the battery negative cable. Turn the ignition
switch to the On position. Place the transmission
gear selector lever in the Neutral position. Place the
mirror switch in the On (the LED in the mirror
switch is lighted) position. Cover the forward facing
ambient photocell sensor to keep out any ambient
light.

NOTE: The ambient photocell sensor must be cov-
ered completely, so that no light reaches the sen-
sor. Use a finger pressed tightly against the sensor,
or cover the sensor completely with electrical tape.

(7) Shine a light into the rearward facing head-

lamp photocell sensor. The mirror glass should
darken. If OK, go to Step 8. If not OK, replace the
faulty automatic day/night mirror unit.

(8) With the mirror glass darkened, place the

transmission gear selector lever in the Reverse posi-
tion. The mirror should return to its normal reflec-
tance. If not OK, replace the faulty automatic day/
night mirror unit.

STANDARD PROCEDURE

STANDARD PROCEDURE - COMPASS
CALIBRATION

AUTOMATIC CALIBRATION

The compass is self calibrating which eliminates

the need to manually set the compass. When the
vehicle is new, the compass may appear erratic and
CAL will be displayed. After completing one 360°
turn with the vehicle traveling less than 8 km/h (5
mph) in an area free from large metal or metallic
objects, CAL will turn off and the compass will func-
tion normally.

MANUAL CALIBRATION

If the compass appears erratic and CAL does not

appear, you must manually put the compass into the
calibration mode. To ensure proper compass calibra-
tion, make sure the compass variance is properly set
before manually calibrating the compass.

To put the compass into calibration mode: Turn the

ignition to the ON position. Press and hold the center
button for 6 seconds to change the display between
VAR (compass variance) and CAL (compass calibra-
tion) modes. To recalibrate the compass, CAL should
display for a complete 1 1/2 360° turns in a area free
from large metal objects or power lines. When the
compass has been calibrated, the CAL symbol will
turn off and the compass will function normally.

8N - 2

POWER SYSTEMS

AUTOMATIC DAY / NIGHT MIRROR (Continued)

STANDARD PROCEDURE - COMPASS
VARIATION ADJUSTMENT

Compass variance is the difference between mag-

netic north and geographic north. In some areas of
the country, the difference between magnetic and
geographic north is great enough to cause the com-
pass to give false readings. If this occurs, the com-
pass variance must be set according to the compass
variance map (Fig. 1).

To set the variance: Turn the ignition to the ON

position. Press and hold the center button for 3 to 6
seconds. The last variance zone number will be dis-
played. Each press of the center button will select a
new variance zone. When the proper zone is selected,
wait 5 seconds to resume normal operation.

Fig. 1 Variance Settings

POWER SYSTEMS

8N - 3

AUTOMATIC DAY / NIGHT MIRROR (Continued)

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