Chrysler Stratus RHD 1997 Interactive Electronic Service Manual page 488

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DESCRIPTION AND OPERATION
HVAC CONTROL MODULE
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . 1
DIAGNOSIS AND TESTING
GRID LINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
HVAC CONTROL MODULE
REAR WINDOW DEFOGGER RELAY . . . . . . . . . 3
DESCRIPTION AND OPERATION
INTRODUCTION
For proper operation of the Rear Window Defogger
system refer to the Owner's Manual.
The system consists of a rear glass with two verti-
cal bus bars and a series of electrically connected
grid lines on the inside surface (Fig. 1). The control
switch is located in the HVAC Control Module. The
relay is located in the junction block. The timer is
located in the Body Control Module (BCM).
Circuit protection for heated grid is provided by:
• Fuse 12 (EBL) located in the power distribution
center
• Rear window defogger relay (EBL) located in the
Junction Block
When the button is depress to the ON position,
current is directed to the rear defogger grid lines. A
yellow indicator within the center of the button will
illuminate while the defogger is ON. The heated grid
lines will heat the rear glass and clear the window
surface of fog or frost.
CAUTION: Grid lines can be damaged or scraped
off with sharp instruments, care should be taken in
cleaning glass or removing foreign materials,
decals or stickers. Normal glass cleaning solvents
or hot water used with rags or toweling is recom-
mended.
HVAC CONTROL MODULE
The rear window control switch and circuit are
integrated into the HVAC control module (Fig. 2).
When actuating the switch it sends a ground signal
to the Body Control Module (BCM). The BCM actu-
ates the relay allowing current to flow through the
grid lines for ten minutes upon initial actuation.
Then 5 minutes with each subsequent actuation or
until either the switch or ignition is turned off. An
ELECTRICALLY HEATED SYSTEMS
. . . . . . . . . . . . . . . . 1
. . . . . . . . . . . . . . . . 2
REAR WINDOW DEFOGGER SWITCH
ELECTRICALLY HEATED SYSTEMS
CONTENTS
page
SYSTEM TEST . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SERVICE PROCEDURES
REPAIR GRID LINES, TERMINALS AND
PIGTAILS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
REMOVAL AND INSTALLATION
HVAC CONTROL . . . . . . . . . . . . . . . . . . . . . . . . 4
REAR WINDOW DEFOGGER RELAY . . . . . . . . . 4
Fig. 1 Rear Window Defogger
indicating lamp illuminates the rear window defogger
switch.
Fig. 2 HVAC Control Module
8N - 1
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