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PL                                                                            ELECTRICALLY HEATED SYSTEMS                      8N - 1

                           ELECTRICALLY HEATED SYSTEMS

                                                          page                                                                   page

DESCRIPTION AND OPERATION                                           GRID LINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
  INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . 1    REAR WINDOW DEFOGGER SWITCH . . . . . . . 3
  REAR WINDOW DEFOGGER SWITCH . . . . . . . 1                      SERVICE PROCEDURES
DIAGNOSIS AND TESTING                                               GRID LINE AND TERMINAL REPAIR . . . . . . . . . 3
  DEFOGGER SYSTEM . . . . . . . . . . . . . . . . . . . . 1

DESCRIPTION AND OPERATION                                          NOTE: This group covers both Left-Hand Drive
                                                                   (LHD) and Right-Hand Drive (RHD) versions of this
INTRODUCTION                                                       model. Whenever required and feasible, the RHD
   For proper operation of the Rear Window Defogger                versions of affected vehicle components have been
system refer to the Owner's Manual.                                constructed as mirror-image of the LHD versions.
   The system consists of a rear glass with two verti-             While most of the illustrations used in this group
cal bus bars and a series of electrically connected                represent only the LHD version, the diagnostic and
grid lines fired on the inside surface. A control switch           service procedures outlined can generally be
and a timer relay combined into a single assembly is               applied to either version. Exceptions to this rule
used on all models (Fig. 1).                                       have been clearly identified as LHD, RHD, or Export
   Circuit protection is provided by a maxi fuse,                  if a special illustration or procedure is required.
located in the Power Distribution Center, for the
heated grid circuit and by a fuse for the relay control
circuit.                                                           REAR WINDOW DEFOGGER SWITCH
   When the switch is turned to the ON position, cur-                The rear window defogger switch is a control
rent is directed to the rear defogger grid lines. The              switch and timer relay integrated into a single panel
heated grid lines heat the rear glass to clear the sur-            mounted assembly. Actuating the switch energizes
face of fog or frost.                                              the circuit which allows current to flow through the
                                                                   grid lines. Upon initial actuation for approximately
CAUTION: Grid lines can be damaged or scraped                      eight to ten minutes, or until either the switch or
off with sharp instruments, care should be taken in                ignition is turned off. An indicating lamp illuminates
cleaning glass or removing foreign materials,                      a lens inlaid in the control switch.
decals or stickers. Normal glass cleaning solvents
or hot water used with rags or toweling is recom-
                                                                   DIAGNOSIS AND TESTING
                                                                   DEFOGGER SYSTEM
                                                                     Electrically heated rear window defogger operation
                                                                   can be checked in vehicle in the following manner:
                                                                     (1) Turn ignition switch to the ON position.
                                                                     (2) Connect an ammeter in series with the battery.
                                                                   Push the defogger control switch to the ON position.
                                                                   A distinct increase in amperage draw should be
                                                                     (3) The rear window defogger operation can be
                                                                   checked by feeling the glass. A distinct difference in
                                                                   temperature between the grid lines and adjacent
                                                                   clear glass can be detected in three to four minutes
                                                                   of operation.
                                                                     (4) Using a DC voltmeter, connect negative lead to
                                                                   Point B, and the positive lead to Point A (Fig. 2). The
                                                                   voltmeter should read 10-14 volts.
              Fig. 1 Rear Window Defogger
         "B'' C.H.M.S.L.
           REAR     "C''
                      WINDOW  PICK-UP
                                    LEADS BARS VOLTAGE FEED "A'' VEHI-
                                            VIEW FROM INSIDE                 TO IGNITION POINT A
                                                                         POWER HEADLAMPBATTERY REAR WINDOWSTRUCTURE
                                                                                                           CAL) LINE
                                                                                                 MIDPOINT (TYPI- ON/OFF    ON SWITCH RELAY
                                                                                                                             GROUND LED
                                                                                                                                 B   NECTOR
                                                                                                                          POINT INDICATING

8N - 2      ELECTRICALLY HEATED SYSTEMS                                                                                                PL
  (5) Step 2, Step 3 or Step 4 above will confirm                        occur in an individual grid line resulting in no cur-
system operation. Indicator light illumination means                     rent flow through the line. To detect breaks in grid
that there is power available at the output of the                       lines the following procedure is required:
relay only, and does not necessarily verify system                          (1) Turn ignition ON and turn control switch to
operation.                                                               ON. The indicator light should come on.
  (6) If turning the switch ON produced no distinct                         (2) Using a DC voltmeter with 0-15 volt range,
current draw on the ammeter the problem should be                        contact terminal B with negative lead of voltmeter.
isolated in the following manner:                                        With positive lead of voltmeter, contact terminal A
     (a) Confirm the ignition switch is ON.                              (Fig. 2). The voltmeter should read 10-14 volts. A
     (b) Ensure that the heated rear glass feed wire                     lower voltage reading indicates a poor connection in
  is connected to the terminal or pigtail and that the                   the feed or the ground circuit.
  ground wire is in fact grounded.                                          (3) With negative lead of voltmeter, contact a good
     (c) Ensure that the maxi-fuse and control circuit                   body ground point. The voltage reading should not
  fuse are OK and all electrical connections are                         change.
  secure.                                                                   (4) Connect negative lead of voltmeter to terminal
  (7) When the above steps have been completed and                       B and touch each grid line at Mid-Point with Positive
the system is still inoperative, one or more of the fol-                 lead. A reading of:
lowing is defective:                                                        

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