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AUTOMATIC DAY / NIGHT MIRROR (Continued)
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 to the junc-
tion block 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.
POWER MIRROR SWITCH
DESCRIPTION
The mirror switch on the door trim panel operates
both the outside rear view mirrors. On vehicles
equipped with Memory/Heated Seats, the Memory
Heated Seat Mirror Module (MHSMM) activates the
mirror motors in recall mode.
OPERATION
Position sensing potentiometers are built into each
mirror's vertical and horizontal motor assembly.
These potentiometers provide a sense voltage to the
MHSMM that indicates where the actual location of
each mirror is. If a memory position is set, the values
of the potentiometers at that location are stored in
memory.
DIAGNOSIS AND TESTING - POWER MIRROR
SWITCH
(1) Remove power mirror switch.
(2) Disconnect wire harness connector from back of
power mirror switch.
(3) Using an ohmmeter, test for continuity between
the terminals of the switch (Fig. 2) as shown in the
Mirror Switch Test table.
(4) If test results are not obtained as shown in the
Mirror Switch Test table, replace the switch.
Fig. 2 Mirror Switch Connector Pin Call-Out
POWER MIRRORS 8N - 9
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