Defogger Switch - Chrysler PT Cruiser Service & Repair Manual

PT
HEATED WINDOW DEFOGGER (Continued)
(2) Connect an ammeter in series with the battery.
Push the rear window defogger switch to the ON
position. A distinct increase in amperage draw should
be noted.
(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 the negative
lead to Point B, and the positive lead to Point A (Fig.
2). The voltmeter should read 10-14 volts.
Fig. 2 Rear Glass Grid Line Test - Typical
1 - REAR WINDOW DEFOGGER
2 - BUS BARS
3 - VOLTAGE FEED "A"
4 - VOLTMETER
5 - PICK-UP LEADS
6 - C.H.M.S.L. TRIM COVER
7 - PARCEL SHELF
8 - GROUND "B"
9 - MID-POINT "C"
(5) Step 2, Step 3 or Step 4 above will confirm
system operation. Indicator light illumination means
that there is power available at the switch output,
and does not necessarily verify system operation.
(6) If turning the switch ON produced no distinct
current draw on the ammeter the problem should be
isolated in the following manner:
(a) Confirm the ignition switch is ON.
(b) Ensure that the heated rear glass feed wire
is connected to the terminal or pigtail and that the
ground wire is in fact grounded.
(c) Ensure that the cartridge fuse and control
circuit fuse are OK and all electrical connections
are secure.
HEATED WINDOW DEFOGGER
(7) When the above steps have been completed and
the system is still inoperative, one or more of the fol-
lowing is defective:
(a) Rear Window Defogger Switch.
(b) All rear window grid lines would have to be
broken or one of the feed wires are not connected
for the system to be inoperative.
(8) If turning the switch ON produces severe volt-
meter deflection, the circuit should be closely checked
for a shorting condition.
(9) If the system operation has been verified but
indicator lamp does not light, replace the switch.
(10) For detailed wiring information, refer to Wir-
ing Diagrams.

DEFOGGER SWITCH

DESCRIPTION
The rear window defogger switch is a control
switch and timing circuit integrated into a single
panel mounted assembly. The switch is located on the
instrument panel center, just below the radio (Fig. 1)
. The rear window defogger switch and the rear win-
dow defogger switch LED indicator cannot be
repaired and, if faulty or damaged, the entire switch
assembly must be replaced.
OPERATION
Actuating the switch energizes the circuit which
allows current to flow through the grid lines. Upon
initial actuation for approximately eight to ten min-
utes, or until either the switch or ignition is turned
off. An indicating lamp illuminates a Light Emitting
Diode (LED) inlaid in the control switch.
DIAGNOSIS AND TESTING
REAR WINDOW DEFOGGER SWITCH
The rear window defogger switch may be tested in
the vehicle or out of the vehicle, on the bench.
IN-VEHICLE TESTING
(1) Remove the switch from the instrument panel
but leave the switch connected, refer to Instrument
Panel Systems, Accessory Switch Bezel Removal and
Installation.
(2) Turn the ignition switch ON.
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