Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Jeep Cherokee XJ 1988-1989.1993-1995 Approved 1995 XJ Jeep Cherokee 95XJ_8N

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J                                                                                     REAR WINDOW DEFOGGER               8N - 1

                                     REAR WINDOW DEFOGGER

                                                             CONTENTS

                                                              page                                                         page

DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1   SERVICE PROCEDURES          ................... 3
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . 1

                                                 GENERAL INFORMATION

  The electrically-heated rear window defogger is an                      A repair kit is available to repair the grid lines and
available option on XJ (Cherokee), and YJ (Wrangler)                    bus bars, or to reinstall the heated glass pigtail
models equipped with the hardtop roof option. Fol-                      wires.
lowing are general descriptions of the major compo-
nents in the rear window defogger system. Refer to                      DEFOGGER SWITCH
Group 8W - Wiring Diagrams for complete circuit de-                       The rear window defogger switch is mounted in the
scriptions and diagrams.                                                instrument panel left of the steering column for XJ,
                                                                        or right of the steering column for YJ. The switch cir-
REAR WINDOW GLASS GRID                                                  cuit is protected by fuse 8 (XJ) or fuse 9 (YJ) in the
  The heated rear window glass has two electrically-                    fuseblock module. Actuating the switch energizes the
conductive vertical bus bars and a series of horizon-                   relay and electronic timer. A light-emitting diode
tal grid lines made of a silver-ceramic material,                       (LED) in the switch (XJ), or a indicator lamp in the
which is baked on and bonded to the inside surface of
                                                                        switch (YJ), illuminates to indicate when the system
the glass. The grid lines and bus bars comprise a
                                                                        is turned on. The defogger switch can not be re-
parallel electrical circuit.
                                                                        paired. If faulty, the switch must be replaced.
  When the rear window defogger switch is placed in
the ON position, current is directed to the rear win-
dow grid lines through the bus bars. The grid lines
                                                                        DEFOGGER RELAY/TIMER
heat the rear window to clear the surface of fog or                       The defogger relay/timer is located in the relay cen-
snow. Circuit protection for the heated grid circuit is                 ter on XJ models, or taped to the instrument panel
provided by fuse 18 (XJ) or fuse 6 (YJ) in the fuse-                    wiring harness behind the parking brake pedal in the
block module.                                                           left cowl side area on YJ models. When the rear de-
  The grid lines and bus bars are highly resistant to                   fogger switch is actuated, the rear defogger relay is
abrasion. However, it is possible for an open to occur                  energized. This causes current to flow through the
in an individual grid line resulting in no current flow                 grid circuit for approximately 10 minutes, or until
through the line. The grid lines can be damaged or                      the rear window defogger switch or ignition switch
scraped off with sharp instruments. Care should be                      are turned off.
taken in cleaning the glass or removing foreign ma-
terials, decals or stickers. Normal glass cleaning sol-
vents or hot water used with rags or toweling is
recommended.


                                                             DIAGNOSIS

SYSTEM TESTS                                                              (4) The rear window defogger operation can be
  Electrically-heated rear window defogger operation                    checked by feeling the glass. A distinct difference in
can be confirmed in the following manner:                               temperature between the grid lines and adjacent
  (1) Turn the ignition switch to the ON position.                      clear glass can be detected within 3 to 4 minutes of
  (2) Turn rear window defogger control switch ON.                      operation.
  (3) Monitor vehicle voltmeter. With the control                         (5) Using a DC voltmeter, contact terminal A (Fig.
switch ON, a distinct needle deflection should be                       1) (passenger side) with the negative lead, and termi-
noted.
8N - 2    REAR WINDOW DEFOGGER                                                                                  J

nal B (driver side) with the positive lead. The volt-     

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