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8T - 2
POWER MIRROR SYSTEMS
DESCRIPTION AND OPERATION (Continued)
selector switch is moved right (right mirror control),
left (left mirror control), or center to turn the power
mirrors off. Then one of four directional control but-
tons is depressed to control movement of the selected
mirror up, down, right, or left. The directional control
buttons of the DDM-mounted switch are illuminated
when the ignition switch is in the On or Accessory
positions. The stand-alone switch is not illuminated.
The stand-alone power mirror switch cannot be
repaired and, if faulty or damaged, it must be
replaced as a complete unit. If the DDM power mir-
ror switch is faulty or damaged, the entire DDM unit
must be replaced.
DOOR MODULE
A Driver Door Module (DDM) and a Passenger
Door Module (PDM) are used on all models equipped
with power locks and power windows. Each door
module houses both the front door power lock and
power window switches. In addition to the switches
for its own door, the DDM houses individual switches
for each passenger door power window, a power win-
dow lockout switch, the power mirror switch, and cir-
cuitry to support the one-touch down feature of the
driver side front door power window. The PDM also
houses the control circuitry and the power lock and
unlock relays for the power lock system.
The DDM and the PDM are mounted to their
respective front door trim panels. The DDM and
PDM are serviced individually and cannot be
repaired. If the DDM or PDM, or any of the switches
and circuitry that they contain are faulty or dam-
aged, the complete DDM or PDM unit must be
replaced.
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 fuse in 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.
(2) Turn the ignition switch to the On position.
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 ignition switch as required.
(3) If the problem being diagnosed is inoperative
illumination of the power mirror switch directional
buttons for the Driver Door Module (DDM)-type
switch, proceed as follows. If not, go to Step 5. Check
the power window circuit breaker in the junction
block. If OK, go to Step 4. If not OK, replace the
faulty circuit breaker.
(4) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Remove the driver side front door trim panel and
unplug the DDM wire harness connectors. Connect
the battery negative cable. Turn the ignition switch
to the On position. Check for battery voltage at the
fused ignition switch output circuit cavity of the
12-way DDM wire harness connector. If OK, replace
the faulty DDM. If not OK, repair the open circuit to
the power window circuit breaker in the junction
block 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. Correct resistance through the electric heating
grid should be from 10 to 16 ohms when measured at
an ambient temperature of 21° C (70° F). If not OK,
replace the faulty power mirror.
(8) Disconnect and isolate the battery negative
cable. Remove the stand-alone power mirror switch
from the driver side front door trim panel or, with a
DDM-mounted switch, remove the driver side front
door trim panel. Unplug the wire harness connector
from the stand-alone switch or the 8-way wire har-
ness connector from the DDM. Connect the battery
negative cable. Turn the ignition switch to the On
position. Check for battery voltage at the fused igni-
tion switch output circuit cavity of the stand-alone
switch wire harness connector or the 8-way DDM
wire harness connector. If OK, go to Step 9. If not
OK, repair the open circuit to the junction block as
required.
(9) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
XJ
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