Dodge 2000 DURANGO Service Manual page 484

8T - 2 POWER MIRROR SYSTEMS
DESCRIPTION AND OPERATION (Continued)
POWER MIRROR SWITCH
Both the right and left power outside mirrors are
controlled by a single multi-function switch unit
located on and mounted to the upper flag area of the
driver side door trim panel. The switch knob is
rotated clockwise (right mirror control), or counter-
clockwise (left mirror control) to select the mirror to
be adjusted. The switch knob is then moved in a joy-
stick fashion to control movement of the selected mir-
ror up, down, right, or left.
The power mirror switch cannot be repaired and, if
faulty or damaged, it must be replaced. The power
mirror switch knob is available for service replace-
ment.
DIAGNOSIS AND TESTING
POWER MIRROR SYSTEM
For circuit descriptions and diagrams, refer to
8W-62 - Power Mirrors in Group 8W - Wiring Dia-
grams.
(1) Check the fuses in the Power Distribution Cen-
ter (PDC) and the junction block. If OK, go to Step 2.
If not OK, repair the shorted circuit or component as
required and replace the faulty fuse(s).
(2) Check for battery voltage at the fuse in the
junction block. If OK, go to Step 3. If not OK, repair
the open circuit to the PDC as required.
(3) Disconnect and isolate the battery negative
cable. Remove the driver side door trim panel and
unplug the wire harness connector from the power
mirror switch. Connect the battery negative cable.
Check for battery voltage at the fused B(+) circuit
cavity in the door wire harness half of the power mir-
ror switch wire harness connector. If OK, go to Step
4. If not OK, repair the open circuit to the junction
block as required.
(4) Disconnect and isolate the battery negative
cable. Check for continuity between the ground cir-
cuit cavity in the door wire harness half of the power
mirror switch 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) If the problem being diagnosed is an inopera-
tive power mirror electric heating grid, proceed as
follows. If not, go to Step 8. Disconnect and isolate
the battery negative cable. Remove the front door
trim panel on the side of the vehicle with the inoper-
ative mirror heating grid. Unplug the wire harness
connector at the mirror. Check for continuity between
the ground circuit cavity in the body half of the
power mirror wire harness connector and a good
ground. If OK, go to Step 6. If not OK, repair the
open circuit to ground as required.
(6) Connect the battery negative cable. Turn the
ignition switch to the On position. Turn on the rear
window defogger system. Check for battery voltage at
the rear window defogger relay output circuit cavity
in the body half of the power mirror wire harness
connector. If OK, go to Step 7. If not OK, repair the
open circuit to the rear window defogger relay as
required.
(7) Check for continuity between the ground cir-
cuit and the rear window defogger relay output cir-
cuit cavities in the mirror half of the power mirror
wire harness connector. There should be continuity. If
not OK, replace the faulty power mirror. If OK, check
the resistance through the electric heating grid cir-
cuit (Fig. 1). Correct resistance through the electric
heating grid should be from 6 to 8.2 ohms when mea-
sured at an ambient temperature of 21° C (70° F). If
not OK, replace the faulty power mirror.
OUTSIDE MIRROR HEATING GRID TEST
CAVITY FUNCTION
4
REAR WINDOW
DEFOGGER
RELAY OUTPUT
5
*WHEN MEASURED AT AN AMBIENT
TEMPERATURE OF 21°C (70°F)
Fig. 1 Outside Mirror Heating Grid Test
(8) Check the power mirror switch continuity as
shown in (Fig. 2). If OK, go to Step 9. If not OK,
replace the faulty switch.
(9) Unplug the wire harness connector at the inop-
erative power mirror. Use two jumper wires, one con-
nected to a 12-volt battery feed, and the other
connected to a good body ground. See the Power Mir-
ror Test chart for the correct jumper wire connections
to the power mirror half of the power mirror wire
harness connector (Fig. 3). If the power mirror(s) do
not respond as indicated in the chart, replace the
faulty power mirror assembly. If the power mirror(s)
do respond as indicated in the chart, repair the cir-
*RESISTANCE
FUSED 6.0 TO 8.2
OHMS
GROUND
DN