Jeep Grand Cherokee WK. Manual — part 375
INSTALLATION
1. Position the EBL relay (2) into the proper recepta-
cle of the junction block (1) located in the passen-
ger compartment.
2. Align the EBL relay terminals with the terminal cav-
ities in the JB receptacle and push down firmly on
the relay until the terminals are fully seated.
3. Install the junction block (JB) (1) (Refer to 8 -
ELECTRICAL/POWER DISTRIBUTION/JUNCTION
BLOCK - INSTALLATION).
4. Reconnect the negative battery cable.
SWITCH-REAR WINDOW DEFOGGER
DESCRIPTION
The switch for the rear window defogger (EBL) system
(1) is integrated into the A/C-heater control (2), which
is located in the center of the instrument panel. When
the rear window defogger switch is activated, the tim-
ing circuit integral to the A/C-heater control operates
the rear window defogger (EBL) relay. An amber indi-
cator (3) in the rear window defogger switch will illu-
minate to indicate when the EBL system is turned on.
When the EBL relay is activated, current is directed to
the rear window defogger grid lines and when
equipped, to the heated outside rear view mirrors. The
grid lines heat the window and mirror glass to help
clear the surfaces of fog or frost.
OPERATION
An LED indicator will illuminate when the rear window defogger switch is activated. When the switch is activated,
the A/C-heater control operates the rear window defogger (EBL) relay. The EBL relay controls the current flow to the
heating grid of the rear window and when equipped, the heated outside rear view mirrors.
NOTE: The EBL system turns off automatically after ten minutes of initial operation. Each following activa-
tion cycle of the EBL system will last five minutes.
The EBL system will initially be on for approximately ten minutes or until the rear window defogger switch or the
ignition switch is turned off. After the initial time interval has expired, if the defogger switch is turned On again during
the same ignition cycle, the EBL system will automatically turn off after about five minutes.
8G - 6
HEATED GLASS - SERVICE INFORMATION
WK
The rear window defogger switch and the rear window defogger LED indicator cannot be repaired and, if faulty or
damaged, the A/C-heater control must be replaced (Refer to 24 - HEATING & AIR CONDITIONING/CONTROLS/
CONTROL-A/C HEATER - REMOVAL).
WK
HEATED GLASS - SERVICE INFORMATION
8G - 7
HEATED MIRRORS - SERVICE INFORMATION
TABLE OF CONTENTS
page
page
HEATED MIRRORS - SERVICE INFORMATION
. . . . . . . . . . . . . . . . . . . . . . . . . . 8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
HEATED MIRRORS - SERVICE INFORMATION
DESCRIPTION
The optional heated mirror system is controlled by the
momentary rear window defogger switch (1) which is
integral to the A/C-heater control (2). An amber indica-
tor lamp in the switch (3) will illuminate to indicate
when the rear window defogger (EBL) system is
turned on.
The heated mirror system only operates in concert with the EBL system, and will be automatically shut off after a
programmed time interval of about ten minutes. After the initial time interval has expired, if the defogger switch is
turned on again during the same ignition cycle, the heated mirror system will automatically shut off after about five
minutes.
The heated mirror system will automatically shut off if the ignition switch is turned to the Off position, or it can be
shut off manually by pressing the rear window defogger switch a second time.
Circuit protection is provided by a cartridge fuse located in the junction block (JB).
OPERATION
When the rear window defogger switch is pressed, the rear window defogger (EBL) system becomes activated and
an electric heater grid located behind the glass of each of the outside rear view mirrors is energized. When ener-
gized, each of these heater grids produce heat to help clear the outside rear view mirrors of ice, snow, or fog.
If the outside mirror heating grids are both inoperative, refer to 8 - ELECTRICAL/HEATED GLASS - DIAGNOSIS
AND TESTING in this group. If only one of the outside mirror heating grids is inoperative, refer to 8 - ELECTRICAL/
POWER MIRRORS - DIAGNOSIS AND TESTING.
The heating grid behind each outside mirror glass cannot be repaired and, if faulty or damaged, the mirror glass
must be replaced (Refer to 23 - BODY/EXTERIOR/MIRROR-SIDE VIEW - GLASS - REMOVAL).
8G - 8
HEATED MIRRORS - SERVICE INFORMATION
WK
HEATED SEATS - ELECTRICAL DIAGNOSTICS
TABLE OF CONTENTS
page
page
HEATED SEATS - ELECTRICAL DIAGNOSTICS
B1085-LEFT HEATED SEAT SWITCH INPUT
CIRCUIT LOW . . . . . . . . . . . . . . . . . . . . . . . . 10
B1088-RIGHT HEATED SEAT SWITCH
INPUT CIRCUIT LOW . . . . . . . . . . . . . . . . . . . 13
CONTROL CIRCUIT LOW . . . . . . . . . . . . . . . 16
CONTROL CIRCUIT OPEN . . . . . . . . . . . . . . 20
CONTROL CIRCUIT LOW . . . . . . . . . . . . . . . 25
CONTROL CIRCUIT OPEN . . . . . . . . . . . . . . 29
B10BB-LEFT HEATED SEAT SWITCH INPUT
CIRCUIT STUCK . . . . . . . . . . . . . . . . . . . . . . 34
B10BC-RIGHT HEATED SEAT SWITCH
INPUT CIRCUIT STUCK . . . . . . . . . . . . . . . . . 37
B221A-HEATED SEAT MODULE INTERNAL
. . . . . . . . . . . . . . 47
FRONT CONTROL MODULE . . . . . . . . . . . . . 50
OCCUPANT RESTRAINT CONTROLLER . . . . 50
OCCUPANT CLASSIFICATION MODULE . . . . 50
CLUSTER/CCN . . . . . . . . . . . . . . . . . . . . . . . 50
U0156-LOST COMMUNICATION WITH EOM
PARKING ASSIST CONTROL MODULE . . . . . 50
U0164-LOST COMMUNICATION WITH HVAC
CONTROL MODULE . . . . . . . . . . . . . . . . . . . 50
VEHICLE SECURITY CONTROL MODULE
(SKREEM/WCM) . . . . . . . . . . . . . . . . . . . . . . 50
SUNROOF CONTROL MODULE . . . . . . . . . . 50
RADIO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
AUDIO AMPLIFIER . . . . . . . . . . . . . . . . . . . . . 51
SDARS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
VEHICLE ENTERTAINMENT CONTROL
MODULE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
HANDS FREE PHONE . . . . . . . . . . . . . . . . . . 51
DRIVER DOOR MODULE . . . . . . . . . . . . . . . . 51
PASSENGER DOOR MODULE . . . . . . . . . . . . 51
MEMORY SEAT CONTROL MODULE . . . . . . . 51
SCCM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
U0231-LOST COMMUNICATION WITH RAIN
SENSING MODULE . . . . . . . . . . . . . . . . . . . . 52
U0241-LOST COMMUNICATION WITH AUTO
HIGHBEAM HEADLAMP CONTROL
MODULE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
U1107–ECU IN SINGLE–WIRE MODE – HSM
BODY VERIFICATION TEST – VER 1
HEATED SEATS - ELECTRICAL DIAGNOSTICS
DIAGNOSIS AND TESTING
WK
HEATED SEATS - ELECTRICAL DIAGNOSTICS
8G - 9
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