Jeep Grand Cherokee WK. Manual — part 713
5. From the outside of the liftgate, install the bezel (2)
over the motor output shaft (3) and engage it in the
mounting hole of the liftgate outer panel.
6. Install the nut (1) that secures the bezel to the
motor output shaft. Tighten the nut to 4.5 N·m (40
in. lbs.).
7. Install the rear wiper arm (Refer to 8 - ELECTRI-
CAL/WIPERS/WASHERS/WIPER ARMS - INSTAL-
LATION).
8. Reconnect the negative battery cable.
RIGHT MULTI-FUNCTION SWITCH
DESCRIPTION
The right (wiper) multi-function switch is secured to
the right side of the multi-function switch mounting
housing at the top of the steering column, just below
the steering wheel. The only visible component of the
right multi-function switch is the control stalk that
extends through a dedicated opening in the right side
of the steering column shrouds and contains the rear
wiper/washer control sleeve (1) and the front wiper
control knob (2). The remainder of the right multi-func-
tion switch is concealed beneath the steering column
shrouds. Refer to 8 - ELECTRICAL/WIPERS/WASH-
ERS/RIGHT MULTI-FUNCTION SWITCH - DESCRIP-
TION for more information.
8R - 74
REAR WIPERS/WASHERS - SERVICE INFORMATION
WK
RELAY-WIPER-REAR
DESCRIPTION
The rear wiper relay (2) conforms to ISO specifica-
tions for current capacities, terminal functions and pat-
terns.
This
relay
is
contained
within
a
small,
rectangular, housing and is connected to all of the
required inputs and outputs through hard-wired con-
nections to the base plate of the junction block (JB)
(1).
The JB is located in the passenger compartment,
underneath the driver side of the instrument panel.
The rear wiper relay cannot be adjusted or repaired
and, if found faulty or damaged, the entire junction
block base plate must be replaced.
OPERATION
The rear wiper relay is an electromechanical switch that uses a low current input from the front control module
(FCM) to control a high current output to the rear wiper motor. The movable common feed contact point is held
against the fixed normally closed contact point by spring pressure. When the relay coil is energized, an electromag-
netic field is produced by the coil windings. This electromagnetic field draws the movable relay contact point away
from the fixed normally closed contact point, and holds it against the fixed normally open contact point. When the
relay coil is de-energized, spring pressure returns the movable contact point back against the fixed normally closed
contact point. A resistor is connected in parallel with the relay coil in the relay, and helps to dissipate voltage spikes
and electromagnetic interference that can be generated as the electromagnetic field of the relay coil collapses.
The rear wiper relay terminals are connected to the vehicle electrical system through hard-wired connections to the
junction block (JB). The inputs and outputs of the rear wiper relay include:
•
Common Feed Terminal - The common feed terminal (30) recieves battery (B+) current through a fuse in the
JB at all times.
•
Coil Ground Terminal - The coil ground terminal (85) is connected to a control output of the FCM through a
rear wiper control circuit. The FCM controls rear wiper motor operation by controlling a ground path through
this circuit.
•
Coil Battery Terminal - The coil battery terminal (86) receives fused battery current at all times.
•
Normally Open Terminal - The normally open terminal (87) is connected to the rear wiper motor control cir-
cuity whenever the relay is energized.
•
Normally Closed Terminal - The normally closed terminal (87A) is not connected to any circuit in this appli-
cation, but provides a battery current output only when the rear wiper relay coil is de-energized.
The rear wiper relay can be diagnosed using conventional diagnostic tools and methods. However, conventional
diagnostic methods may not prove conclusive in the diagnosis of the steering control module (SCM), FCM or the
electronic message inputs to or outputs from the SCM and the FCM that control the operation of the rear wiper
relay. The most reliable, efficient, and accurate means to diagnose the rear wiper relay, SCM, FCM or the electronic
message inputs and outputs related to the rear wiper relay operation requires the use of a diagnostic scan tool.
Refer to the appropriate diagnostic information.
WK
REAR WIPERS/WASHERS - SERVICE INFORMATION
8R - 75
REMOVAL
1. Disconnect and isolate the negative battery cable.
2. Disconnect
the
wire
harness
connectors
and
remove the junction block (JB) (1) from the mount-
ing bracket (2) underneath the left side of the
instrument panel (Refer to 8 - ELECTRICAL/
POWER
DISTRIBUTION/JUNCTION
BLOCK
-
REMOVAL).
NOTE: To aid in reinstallation, note the installed
positions of all of the replaceable ISO relays and
all fuses prior to removing them from the base
plate of the JB.
3. Remove all of the fuses and replaceable ISO
relays (3) from the bottom and top side of the JB
base plate.
INSTALLATION
CAUTION: Make sure to properly position of all of
the replaceable ISO relays and all fuses into the
base plate of the junction block (JB). Failure to
properly install the relays and fuses could cause
possible damage to vehicle wiring and electronic
systems.
1. Position the replaceable ISO relays and fuses (3)
to the bottom and the top side of the base plate of
the junction block (JB) (1).
2. Align the relay and fuse terminals with there proper
terminal cavities in the JB and push down firmly on
the relays and fuses until their terminals are fully
seated.
3. Install the junction block (JB) onto the mounting
bracket (2) and connect the wire harness connec-
tors (Refer to 8 - ELECTRICAL/POWER DISTRI-
BUTION/JUNCTION BLOCK - INSTALLATION).
4. Reconnect the negative battery cable.
8R - 76
REAR WIPERS/WASHERS - SERVICE INFORMATION
WK
NAVIGATION/TELECOMMUNICATION
TABLE OF CONTENTS
page
page
NAVIGATION/TELECOMMUNICATION -
ELECTRICAL DIAGNOSTICS. . . . . . . . . . . . . . . . . 1
NAVIGATION/TELECOMMUNICATION -
SERVICE INFORMATION . . . . . . . . . . . . . . . . . . 58
NAVIGATION/TELECOMMUNICATION - ELECTRICAL
DIAGNOSTICS
TABLE OF CONTENTS
page
page
NAVIGATION/TELECOMMUNICATION -
ELECTRICAL DIAGNOSTICS
DIAGNOSIS AND TESTING
B1411-HFM LEFT AUDIO OUTPUT CIRCUIT
LOW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
B1412-HFM LEFT AUDIO OUTPUT CIRCUIT
HIGH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
CIRCUIT LOW . . . . . . . . . . . . . . . . . . . . . . . . 11
CIRCUIT HIGH . . . . . . . . . . . . . . . . . . . . . . . . 15
SWITCH INPUT CIRCUIT PERFORMANCE . . 19
SWITCH INPUT CIRCUIT LOW . . . . . . . . . . . 21
SWITCH INPUT CIRCUIT HIGH . . . . . . . . . . . 24
B1438–VOICE RECOGNITION SWITCH
STUCK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
B145A-TELEMATICS MIRROR CONTROL
CIRCUIT HIGH . . . . . . . . . . . . . . . . . . . . . . . . 32
B1459-TELEMATICS MIRROR CONTROL
CIRCUIT LOW . . . . . . . . . . . . . . . . . . . . . . . . 36
PERFORMANCE . . . . . . . . . . . . . . . . . . . . . . 40
B2203–ROM CHECKSUM PERFORMANCE
B222E–FLASH CHECKSUM PERFORMANCE
INTERNAL . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
. . . . . . . . . . . . . . . . . . . . 52
FRONT CONTROL MODULE . . . . . . . . . . . . . 55
OCCUPANT RESTRAINT CONTROLLER . . . . 55
OCCUPANT CLASSIFICATION MODULE . . . . 55
CLUSTER/CCN . . . . . . . . . . . . . . . . . . . . . . . 55
U0156-LOST COMMUNICATION WITH EOM
PARKING ASSIST CONTROL MODULE . . . . . 55
U0164-LOST COMMUNICATION WITH HVAC
CONTROL MODULE . . . . . . . . . . . . . . . . . . . 55
INTRUSION TRANSCEIVER CONTROL
MODULE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
VEHICLE SECURITY CONTROL MODULE
(SKREEM/WCM) . . . . . . . . . . . . . . . . . . . . . . 55
SUNROOF CONTROL MODULE . . . . . . . . . . 56
RADIO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
AUDIO AMPLIFIER . . . . . . . . . . . . . . . . . . . . . 56
SDARS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
VEHICLE ENTERTAINMENT CONTROL
MODULE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
DRIVER DOOR MODULE . . . . . . . . . . . . . . . . 56
PASSENGER DOOR MODULE . . . . . . . . . . . . 56
WK
NAVIGATION/TELECOMMUNICATION
8T - 1
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