Dodge Viper SRT-10 (ZB). Manual — part 67
ELECTRICAL/HEATED
GLASS/REAR
WINDOW
DEFOGGER GRID - STANDARD PROCEDURE -
GRID LINE AND TERMINAL REPAIR).
DIAGNOSIS AND TESTING
ELECTRIC BACKLIGHT (EBL) SYSTEM
NOTE: Illumination of the defogger switch indicator
lamp does not necessary mean that electrical cur-
rent is reaching the rear glass heating grid lines.
NOTE: For circuit descriptions and diagrams of the
rear window defogger (EBL) system, refer to 8W -
WIRING DIAGRAM INFORMATION.
Operation of the electrical backlight (EBL) system
can be confirmed by the following:
(1) Turn the ignition switch to the On position. Set
the rear window defogger switch in the On position.
The rear window defogger operation can be checked
by feeling the surfaces of the rear window glass or
outside rear view mirror glass. A distinct difference
in temperature between the grid lines and the adja-
cent clear glass or the mirror glass should be
detected within three to four minutes of operation.
(2) If a temperature difference is not detected, use
a 12-volt DC voltmeter and contact the rear glass
heating grid power feed terminal A with the positive
lead, and the ground terminal B with the negative
lead (Fig. 3). The voltmeter should read battery volt-
age. If the voltmeter does not read battery voltage,
check the following:
• Confirm that the ignition switch is On.
• Make sure that the rear glass heating grid feed
wire and ground wire are connected to the terminals.
Confirm that the ground wire has continuity to
ground.
• Check the EBL relay and fuse located in the
power distribution center (PDC) in the engine com-
partment. The relay and fuse must be tight in their
receptacles and all electrical connections must be
secure. Refer to the appropriate wiring information
for diagnosis and testing of the ISO-standard relay.
(3) When the above steps have been completed and
the system is still inoperative, one or more of the fol-
lowing could be defective. It may be necessary to con-
nect
a
DRBIII
t scan tool to perform further
diagnostics. Refer to Body Diagnostic Procedures.
• Rear window defogger switch in the A/C-heater
control.
• Rear window defogger timing circuity in the A/C-
heater control.
• Fused ignition switch output circuit from the
body control module (BCM).
• Rear window defogger grid lines (all grid lines
would have to be broken, or the power feed or the
ground wire disconnected, for the entire heating grid
to be inoperative).
(4) If the EBL system operation has been verified
but rear window defogger LED indicator does not
illuminate, replace the A/C-heater control (Refer to
24 - HEATING & AIR CONDITIONING/CONTROLS/
A/C HEATER CONTROL - REMOVAL).
REAR WINDOW DEFOGGER
RELAY
DESCRIPTION
The rear window defogger (EBL) relay (Fig. 4) is a
International Standards Organization (ISO) micro-re-
lay. Relays conforming to the ISO specifications have
Fig. 2 Rear Window Defogger Switch
1 - BLOWER SPEED CONTROL
2 - TEMPERATURE CONTROL
3 - MODE CONTROL
4 - A/C SELECT SWITCH
5 - REAR WINDOW DEFOGGER SWITCH
Fig. 3 Grid Line Test
1 - VIEW FROM INSIDE VEHICLE
2 - HEATED WINDOW GRID
3 - BUS BARS
4 - VOLTAGE FEED (A)
5 - VOLTMETER
6 - MID-POINT (C)
7 - PICK-UP LEADS
8 - GROUND (B)
8G - 2
HEATED SYSTEMS
ZB
HEATED GLASS (Continued)
common physical dimensions, current capacities, ter-
minal functions and patterns. The ISO micro-relay
terminal functions are the same as a conventional
ISO relay. However, the ISO micro-relay terminal
pattern (or footprint) is different, the current capac-
ity is lower, and the physical dimensions are smaller
than those of the conventional ISO relay. The EBL
relay is a electromechanical device that switches bat-
tery current through a fuse in the power distribution
center (PDC) to the rear window defogger grid. The
EBL relay is energized when the relay coil is pro-
vided a ground path by the control circuitry within
the A/C-heater control.
The EBL relay is located in the PDC in the engine
compartment.
OPERATION
The ISO-standard rear window defogger (EBL)
micro-relay is an electromechanical switch that uses
a low current input controlled by the A/C-heater con-
trol to control the high current output to the rear
window defogger grid lines. The movable, common
feed relay contact is held against the fixed, normally
closed relay contact by spring pressure. When the
electromagnetic relay coil is energized, it draws the
movable common feed relay contact away from the
fixed, normally closed relay contact and, holds it
against the fixed, normally open relay contact. This
action allows high current to flow to the rear window
defogger grid lines.
When the relay coil is de-energized, spring pres-
sure returns the movable relay contact back against
the fixed, normally closed contact point. The resistor
or diode is connected in parallel with the relay coil,
and helps to dissipate voltage spikes and electromag-
netic interference that can be generated as the elec-
tromagnetic field of the relay coil collapses.
The EBL relay terminals are connected to the vehi-
cle electrical system through a receptacle in the
power distribution center (PDC). The inputs and out-
puts of the EBL relay include:
• The common feed terminal (86) receives a bat-
tery current input from a fuse in the PDC through a
fused B(+) circuit at all times.
• The coil ground terminal (83) receives a ground
input from the A/C-heater control when the A/C-
heater control electronically pulls the control circuit
to ground.
• The coil battery terminal (85) receives a battery
current input from the body control module (BCM)
only when the ignition switch is in the Run position.
• The normally open terminal (82) provides a bat-
tery current output to the rear window defogger
through the relay output circuit only when the rear
window defogger relay coil is energized.
• The normally closed terminal (82A) is not con-
nected to any circuit in this application, but provides
a battery current output only when the rear window
defogger relay coil is de-energized.
The EBL micro-relay cannot be repaired and, if
faulty or damaged, it must be replaced. Refer to the
appropriate wiring information for diagnosis and
testing of the ISO-standard micro-relay and for com-
plete rear window defogger (EBL) wiring diagrams.
REMOVAL
(1) Disconnect and isolate the negative battery
cable.
(2) Remove the cover from the power distribution
center (PDC) (Fig. 5) located in the engine compart-
ment.
NOTE: Refer to the fuse and relay layout map on
the inside of the PDC cover for EBL relay location.
(3) Remove the EBL relay from the PDC.
INSTALLATION
NOTE: Refer to the fuse and relay layout map on
the inside of the power distribution center (PDC)
cover for EBL relay location.
(1) Position the EBL relay into the proper recepta-
cle of the PDC located in the engine compartment.
(2) Align the EBL relay terminals with the termi-
nal cavities in the PDC receptacle and push down
firmly on the relay until the terminals are fully
seated.
Fig. 4 Rear Window Defogger Relay
30 - COMMON FEED
85 - COIL GROUND
86 - COIL BATTERY
87 - NORMALLY OPEN
87A - NORMALLY CLOSED
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HEATED SYSTEMS
8G - 3
REAR WINDOW DEFOGGER RELAY (Continued)
(3) Install the cover onto the PDC.
(4) Reconnect the negative battery cable.
REAR WINDOW DEFOGGER
SWITCH
DESCRIPTION
The switch for the rear window defogger (EBL) sys-
tem (Fig. 6) is integrated into the A/C-heater control,
which is located in the center of the instrument panel.
When the rear window defogger switch is activated, the
timing circuit integral to the A/C-heater control operates
the rear window defogger (EBL) relay.
When the EBL relay is activated, current is
directed to the rear defogger grid lines. The grid lines
heat the glass to help clear the surface 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 grids of the rear win-
dow defogger.
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 approxi-
mately ten minutes or until the rear window defog-
ger 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.
The rear window defogger switch and the rear win-
dow defogger LED indicator cannot be repaired and,
if faulty or damaged, the A/C-heater control must be
replaced (Refer to 24 - HEATING & AIR CONDI-
TIONING/CONTROLS/A/C-HEATER
CONTROL
-
REMOVAL).
REAR WINDOW DEFOGGER
GRID
STANDARD PROCEDURE
GRID LINE AND TERMINAL REPAIR
REAR WINDOW DEFOGGER GRID LINE REPAIR
WARNING: Materials contained in the Repair Kit (Part
Number 04549275) may cause skin or eye irritation.
The kit contains epoxy resin and amine type hardener,
which are harmful if swallowed. Avoid contact with the
skin and eyes. For skin contact, wash the affected
areas with soap and water. For contact with the eyes,
flush with plenty of water. Do not take internally. If
taken internally, induce vomiting and call a physician
immediately. Use with adequate ventilation. Do not use
near fire or flame. Contains flammable solvents. Keep
out of the reach of children. Failure to follow the warn-
ings could result in possible personal injury or death.
Repair of the rear glass heating grid lines and bus
bars can be accomplished using the Mopar
t Rear
Window
Defogger
Repair
Kit
(Part
Number
04549275) or equivalent.
(1) Mask the repair area with masking tape or use a
template so that the conductive epoxy can be applied
Fig. 5 Rear Window Defogger (EBL) Relay
1 - POWER DISTRIBUTION CENTER (PDC)
2 - BRAKE MASTER CYLINDER RESERVOIR
Fig. 6 Rear Window Defogger Switch
1 - BLOWER SPEED CONTROL
2 - TEMPERATURE CONTROL
3 - MODE CONTROL
4 - A/C SELECT SWITCH
5 - REAR WINDOW DEFOGGER SWITCH
8G - 4
HEATED SYSTEMS
ZB
REAR WINDOW DEFOGGER RELAY (Continued)
neatly (Fig. 7). Extend the epoxy application onto the
grid line or the bus bar on each side of the break.
(2) Follow the instructions in the repair kit for
preparing the damaged area.
(3) Remove the package separator clamp and mix
the two conductive epoxy components thoroughly
within the packaging. Fold the package in half and
cut the center corner to dispense the epoxy.
(4) Apply the epoxy through the slit in the mask-
ing tape or template. Overlap both ends of the break
by at least 19 millimeters (0.75 inch).
(5) Carefully remove the masking tape or template.
CAUTION: Do not allow the glass surface to exceed
204° C (400° F) when using a heat gun, or the glass
may fracture.
(6) Allow the epoxy to cure 24 hours at room tem-
perature, or carefully use a heat gun for fifteen min-
utes. When using a heat gun, hold it approximately
25.4 centimeters (10 inches) from the repair and do
not allow the glass surface to exceed 204° C (400° F).
(7) After the conductive epoxy is properly cured,
check the operation of the rear window defogger
glass heating grid.
REAR WINDOW DEFOGGER TERMINAL REPAIR
CAUTION: Do not use a flame type solder gun or an
electric solder gun rated greater than 500 watts or
damage to the glass may occur.
If the rear window defogger grid terminal(s) is
damaged or separated from the rear window, the new
grid terminal(s) must be securely fastened to the rear
window defogger bus bar by soldering.
(1) If the grid terminal(s) is broken and a portion
of the terminal is still attached to the heating grid,
remove the portion of the clip remaining in the wire
harness connector(s).
CAUTION: To prevent the glass from fracturing, do not
allow the glass surface to exceed 204° C (400° F).
(2) If the grid terminal(s) is broken and a portion
of the terminal is still attached to the rear window
defogger bus bar, apply heat with a solder gun to the
portion of the terminal on the glass until the solder
starts to flow. Remove the terminal and carefully
smooth the solder on the bus bar.
NOTE: Wait five minutes for the glass to cool after
applying heat with a solder gun before proceeding.
NOTE: Use care when cleaning the mating surfaces.
Excessive abrasion may wear away the copper grid
surface causing grid continuity to be lost.
(3) Clean the mating surfaces on the grid bus bar
and the new terminal(s) with “000” Extra Fine Steel
Wool or an equivalent.
NOTE: The terminal attaching clip(s) must face out-
board. Failure to reorient the terminal(s) may result
in an additional failure.
(4) Properly orient the new terminal(s) with the
attaching clip facing outboard in the original loca-
tion(s) on the grid bus bar and hold the terminal(s)
with a metal pick or other suitable pointed tool.
CAUTION: Do not allow the glass surface to exceed
204° C (400° F), glass may fracture.
NOTE: New rear window defogger terminals are pre-
soldered and fluxed. Do not reuse a terminal if it
has been previously heated.
Place the solder gun onto the new terminal(s) and
heat the terminal until the solder flows. Remove the
solder gun and continue to hold the terminal in the
correct position for an additional five seconds.
(5) Allow the solder to cool for ten minutes.
NOTE: To ensure proper installation, do not attach
the wire harness connector(s) to the terminal(s)
until the solder is completely cooled.
(6) After the solder has cooled, reconnect the wire
harness connector(s) and verify operation of the rear
window defogger.
Fig. 7 Grid Line Repair
1 - BREAK
2 - GRID LINE
3 - MASKING TAPE
ZB
HEATED SYSTEMS
8G - 5
REAR WINDOW DEFOGGER GRID (Continued)
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