Mercedes-Benz Sprinter / Dodge Sprinter. Manual - part 217

energizes the timing circuit of the rear window defog-
ger module which then activates the rear window
defogger (EBL) relays. The EBL relays controls the
current flow to the rear window defogger grids. The
EBL system will operate for approximately five min-
utes or until the rear window defogger switch or igni-
tion switch is turned off. Refer to 8 - ELECTRICAL/
HEATED GLASS - DIAGNOSIS AND TESTING for
diagnosis and testing of the rear window defogger
switch.

The

rear

window

defogger

switch

cannot

repaired and, if faulty or damaged, it must be
replaced.

DIAGNOSIS AND TESTING

REAR WINDOW DEFOGGER SWITCH

WARNING: On vehicles equipped with airbags, dis-
able the airbag system before attempting any steer-
ing wheel, steering column, or instrument panel
component diagnosis or service. Disconnect and
isolate the battery negative (ground) cable, then
wait two minutes for the airbag system capacitor to
discharge before performing further diagnosis or
service. This is the only sure way to disable the air-
bag system. Failure to take the proper precautions
could result in an accidental airbag deployment and
possible personal injury.

NOTE: The rear window defogger switch may be
tested in the vehicle or out of the vehicle, on a
bench.

NOTE: For circuit descriptions and diagrams of the
rear window defogger system, refer to 8W - WIRING
DIAGRAM INFORMATION.

(1) Remove the rear window defogger switch from

the instrument panel, but leave the switch connected
(Refer to 8 - ELECTRICAL/HEATED GLASS/REAR
WINDOW DEFOGGER SWITCH - REMOVAL).

(2) Turn the ignition switch ON.
(3) Using a voltmeter, check for battery voltage at

Pin 3 of the rear window defogger switch (Fig. 6).

(a) If OK, go to Step 4.
(b) If NOT OK, check fuse 7 (15 amp) in fuse

block #1. If fuse is OK, check the wiring circuits.
Refer to 8W - WIRING DIAGRAM INFORMA-
TION.
(4) Check Pin 7, with defogger switch in the On

position there should be battery voltage and, no volt-
age with the switch in the Off position.

(a) If OK, go to Step 5.

(b) If NOT OK, no voltage in the On position or

voltage in the Off position, replace the rear window
defogger switch.
(5) Press the defogger switch to the On position.

The indicator lamp should come on and remain on
for approximately 5 minutes.

(a) If OK, install the rear window defogger

switch

(Refer

ELECTRICAL/HEATED

GLASS/REAR WINDOW DEFOGGER SWITCH -
INSTALLATION).

(b) If NOT OK, go to Step 6.

(6) Check Pin 9, with defogger switch in the On

position there should be battery voltage.

(a) If OK, go to Step 7.
(b) If NOT OK, check the wiring circuits. Refer

to 8W - WIRING DIAGRAM INFORMATION.
(7) Check Pin 10 for a good ground.

(a) If OK, replace the rear window defogger

switch.

(b) If NOT OK, check the wiring circuits. Refer

to 8W - WIRING DIAGRAM INFORMATION.

Fig. 6 Rear Window Defogger Switch Connector

HEATED GLASS

8G - 5

DEFOGGER SWITCH CONNECTOR PIN

CALL-OUT

PIN

FUNCTION

FUSED B+ (DRL RELAY)

IGNITION SWITCH OUTPUT (START-
RUN)

PANEL LAMPS DRIVER

DEFOGGER SWITCH OUTPUT

PANEL LAMPS DRIVER

GROUND

REMOVAL

WARNING: To avoid personal injury or death, on
vehicles equipped with airbags, disable the supple-
mental

restraint

system

before

attempting

any

steering wheel, steering column, airbag, seat belt
tensioner, or instrument panel component diagno-
sis or service. Disconnect and isolate the battery
negative (ground) cable, then wait two minutes for
the system capacitor to discharge before perform-
ing further diagnosis or service. This is the only
sure way to disable the supplemental restraint sys-
tem. Failure to take the proper precautions could
result in accidental airbag deployment.

(1) Disconnect and isolate the negative battery

cable.

(2) Remove the cluster bezel from the instrument

panel (Fig. 7) (Refer to 23 - BODY/INSTRUMENT
PANEL/CLUSTER BEZEL - REMOVAL).

(3) From the back of the cluster bezel, squeeze the

two latches on the rear window defogger switch body
and push the switch out through the face of the bezel
(Fig. 8).

(4) Remove the rear window defogger switch from

the cluster bezel.

INSTALLATION

(1) Position the rear window defogger switch to the

proper mounting hole on the face of the cluster bezel.

(2) Using hand pressure, push the rear window

defogger switch firmly and evenly into the switch

Fig. 7 Cluster Bezel Remove/Install

1 - SCREWS (2)
2 - CLUSTER BEZEL
3 - REAR WINDOW DEFOGGER SWITCH
4 - DEFOGGER SWITCH CONNECTOR
5 - WIRE HARNESS CONNECTOR
6 - WIRE HARNESS CONNECTOR

Fig. 8 Headlamp Leveling Switch Remove/Install

1 - SWITCH
2 - LATCH (2)
3 - CLUSTER BEZEL

8G - 6

HEATED GLASS

mounting hole of the cluster bezel until both of the
latches on the switch body are fully engaged.

(3) Install the cluster bezel (Refer to 23 - BODY/

INSTRUMENT

PANEL/CLUSTER

BEZEL

INSTALLATION).

(4) Reconnect the negative battery cable.

REAR WINDOW DEFOGGER
GRID

STANDARD PROCEDURE

GRID LINE AND TERMINAL REPAIR

REAR WINDOW DEFOGGER GRID LINE REPAIR

WARNING: The repair kit contains epoxy resin and
amine type hardener which may cause skin or eye
irritation and can be harmful if swallowed. Use with
adequate ventilation. Do not use near fire or open
flame the contents contain flammable solvents.
Keep out of reach of children.

•

DO NOT TAKE INTERNALLY, IF SWALLOWED

INDUCE VOMITING AND CALL A PHYSICIAN IMME-
DIATELY.

•

IF SKIN CONTACT OCCURS, WASH AFFECTED

AREAS WITH SOAP AND WATER.

•

IF EYE CONTACT OCCURS, FLUSH WITH

PLENTY OF WATER.

The repair of the grid lines is possible using the

Mopar

t Grid Line Repair Package or an equivalent.

(1) Mask the repair area so the conductive epoxy

can be extended onto the grid line(s) or the bus bar
(Fig. 9).

(2) Follow the instructions in the repair kit for

preparing the damaged area.

(3) Remove the package separator clamp and mix

the conductive epoxy thoroughly. Fold in half and cut
the center corner to dispense the epoxy.

(4) Apply the conductive epoxy through the slit in

the masking tape. Overlap both ends of the break(s)
by 19 mm (3/4 inch).

(5) Carefully remove the masking tape from the

grid line(s).

CAUTION: To prevent the glass from fracturing, do
not allow the glass surface to exceed 204° C (400°
F).

(6) Allow the epoxy to cure 24 hours at room tem-

perature or use a heat gun with a 260° to 371° C
(500° to 700° F) range for 15 minutes. Hold the heat
gun approximately 254 mm (10 inches) from the
repaired area.

(7) After the conductive epoxy is properly cured,

verify operation of the rear window defogger.

REAR WINDOW DEFOGGER GRID 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.

Fig. 9 Grid Line Repair

1 - BREAK
2 - GRID LINE
3 - MASKING TAPE

HEATED GLASS

8G - 7

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.

8G - 8

HEATED GLASS

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