Chrysler 300M 1999 Manual page 441

TEST 12A
REPAIRING REAR WINDOW DEFOGGER
Perform TEST 1A Before Proceeding
START TEST 12A.
WITH THE DRB ENTER
"SENSORS" AND READ
THE "MODE SWITCH
MUX" VOLTAGE.
TURN IGNITION OFF.
TURN IGNITION ON.
TURN THE REAR
WINDOW DEFOGGER
SWITCH ON.
DISCONNECT THE REAR
WINDOW DEFOGGER
RELAY HARNESS
CONNECTOR.**
SEE GENERAL INFO 4.0
*Perform Verification TEST VER-2A.
KEY ON.
WITH THE DRB ENTER
"BODY COMPUTER"
AND READ THE
DTC'S.
PRESS AND HOLD THE
REAR DEFOGGER
BUTTON AND OBSERVE
THE "MODE SWITCH
MUX" VOLTAGE.
USING A N OHMMETER ,
BACKPROBE THE
DEFOGGER G ROU ND
CKT AT LEFT REAR
OF GLASS GRID.
USING A VOLTMETER,
BACKPROBE THE REAR
DEFOGGER RELAY
OUTPUT CKT AT RIGHT
REAR GLASS GRID.
USING A VOLTMETER,
MEASURE THE FUSED
B(+) CIRCUITS.
FIG. 1
**Check connectors - Clean / repair as necessary.
431
ARE ANY MANUAL
TEMP CONTROL YES
TROUBLE CODES
PRESENT?
NO
IS THE VOLTAGE NO
APPROXIMATELY 0.25
VOLTS?
YES
IS THE RESISTANCE NO
BELOW 5.0 OHMS?
YES
IS THE VOLTAGE YES
ABOVE 10.0 VOLTS?
NO
IS THE VOLTAGE NO
ABOVE 10.0 VOLTS?
YES
PERFORM TEST
1A.
REPLACE THE
A/C-HEATER CONTROL
HEAD.*
REPAIR THE OPEN
GROUND CIRCUIT TO
THE REAR WINDOW
DEFOGGER
ELEMENTS.*
REPAIR THE REAR
WINDOW DEFROSTER
BROKEN ELEMENT(S)
AS NECESSARY.*
PERFORM TEST
12B.
CONTINUE TEST
12A ON THE NEXT
PAGE.
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