The automatic day/night mirror system is able to automatically change the reflectance of the inside rear view mirror
in order to reduce the glare of headlamps approaching the vehicle from the rear. The automatic day/night rear view
mirror receives battery current through a fuse in the Integrated Power Module (IPM) only when the ignition switch is
in the On position.

OUTSIDE REAR VIEW MIRROR

The power operated outside rear view mirrors allow the driver to adjust both outside mirrors electrically from the
driver side front seat position by operating a switch on the driver side front door trim panel. The power mirrors
receive a non-switched battery feed through a fuse in the Integrated Power Module (IPM) so that the system will
remain operational, regardless of the ignition switch position.

OPERATION

AUTOMATIC DAY/NIGHT MIRROR

A switch located on the bottom of the automatic day/night mirror housing allows the vehicle operator to select
whether the automatic dimming feature is operational. When the automatic day/night mirror is turned on, the mirror
switch is lighted by an integral Light-Emitting Diode (LED). The mirror will automatically disable its self-dimming
feature whenever the vehicle is being driven in reverse.

OUTSIDE REAR VIEW MIRROR

The heated mirrors include an electric heating grid behind the mirror glass in each outside mirror, which can clear
the mirror glass of ice, snow, or fog. (Refer to 8 - ELECTRICAL/HEATED MIRRORS - DESCRIPTION) for more
information.

DIAGNOSIS AND TESTING

POWER MIRRORS

WIRING VOLTAGE TEST

The following wiring test determines whether or not voltage is continuous through the body harness to switch.

1. Remove the power mirror switch (Refer to 8 - ELECTRICAL/POWER LOCKS/DOOR MODULE - REMOVAL).

2. Disconnect wire harness connector from back of power mirror switch.

3. Connect the clip end of a 12 volt test light to Pin 5 in the mirror switch harness connector. Touch the test light

probe to Pin 3.

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If the test light illuminates, the wiring circuit between the battery and switch is OK.

If the lamp does not illuminate, first check fuse in the Integrated Power Module (IPM). If fuse is OK, then check for
a broken wire.

Refer to the appropriate wiring information.

POWER MIRROR MOTOR TEST

If the power mirror switch is receiving proper current
and ground and mirrors do not operate, proceed with
power mirror motor test. Refer to the appropriate wir-
ing information.

1. Remove the power mirror switch (Refer to 8 -

ELECTRICAL/POWER LOCKS/DOOR MODULE -
REMOVAL).

2. Disconnect wire harness connector to power mirror

switch.

3. Using two jumper wires:

•

Connect one to a 12 volt source

•

Connect the other to a good body ground

•

Refer to the Mirror Motor Test Chart for proper
wire connections at the switch connector

MIRROR MOTOR TEST CHART

12 VOLTS

GROUND

MIRROR REACTION

SWITCH CONNECTOR

RIGHT

LEFT

PIN 1

PIN 2

PIN 6

PIN 2

LEFT

PIN 2

PIN 1

DOWN

PIN 2

PIN 6

RIGHT

PIN 7

PIN 2

PIN 4

PIN 2

LEFT

PIN 2

PIN 7

DOWN

PIN 2

PIN 4

RIGHT

4. If results shown in table are not obtained, check for open or shorted circuit. Replace mirror assembly as

necessary.

MIRROR-AUTOMATIC DAY / NIGHT

DESCRIPTION

The automatic day/night mirror uses a thin layer of electrochromic material between two pieces of conductive glass
to make up the face of the mirror. When the mirror switch is in the On position, two photocell sensors are used by
the mirror circuitry to monitor external light levels and adjust the reflectance of the mirror.

OPERATION

The ambient photocell sensor is located on the forward-facing (windshield side) of the rear view mirror housing, and
detects the ambient light levels outside of the vehicle. The headlamp photocell sensor is located inside the rear view
mirror housing behind the mirror glass and faces rearward, to detect the level of the light being received at the rear
window side of the mirror. When the circuitry of the automatic day/night mirror detects that the difference between
the two light levels is too great (the light level received at the rear of the mirror is much higher than that at the front
of the mirror), it begins to darken the mirror.

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The automatic day/night mirror circuitry also monitors the transmission using an input from the backup lamp circuit.
The mirror circuitry is programmed to automatically disable its self-dimming feature whenever it senses that the
transmission backup lamp circuit is energized.

The automatic day/night mirror is a completely self-contained unit and cannot be repaired. If faulty or damaged, the
entire mirror assembly must be replaced.

DIAGNOSIS AND TESTING

AUTOMATIC DAY / NIGHT MIRROR

For complete circuit diagrams, refer to the appro-
priate wiring information.

1. Check the fuse in the Integrated Power Module

(IPM). 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 in the IPM. If OK, go
to Step 3. If not OK, repair the open circuit to the
ignition switch as required.

3. Turn the ignition switch to the Off position. Discon-

nect and isolate the battery negative cable. Unplug
the wire harness connector from the automatic 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 out-
put (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 to the IPM 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 cavity of the automatic day/night mirror wire harness connector and a good ground.
There should be continuity. If OK, go to Step 5. If not OK, repair the circuit 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 automatic 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 covered completely, so that no light reaches the sensor. Use
a finger pressed tightly against the sensor, or cover the sensor completely with electrical tape.

7. Shine a light into the rearward facing headlamp 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 position. The mirror

should return to its normal reflectance. If not OK, replace the faulty automatic day/night mirror unit.

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SWITCH - POWER MIRROR

DIAGNOSIS AND TESTING

POWER MIRROR SWITCH

The power mirror switch is included with the window/lock switch. (Refer to 8 - ELECTRICAL/POWER LOCKS/DOOR
MODULE - DIAGNOSIS AND TESTING).

REMOVAL

The power mirror switch is included with the window/lock switch. (Refer to 8 - ELECTRICAL/POWER LOCKS/DOOR
MODULE - REMOVAL).

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