REAR WINDOW DEFOGGER RELAY TEST
POTENTIAL PROBLEM
SYSTEM
ON OR OFF
WITH
ENGINE
RUNNING
VOLTAGE AT REAR WINDOW
DEFOGGER RELAY POINT TO
GOOD VEHICLE GROUND
VOLTAGE AT
REAR WINDOW
DEFOGGER
GRID TO GOOD
VEHICLE
GROUND
1234AB
NO PROBLEM. VOLTAGES AS
EXPECTED WITH THE SYSTEM
OFF.
OFF
MORE
THAN
11
MORE
THAN
11
0
MORE
THAN
11
00
NO PROBLEM. VOLTAGES AS
EXPECTED WITH THE SYSTEM
ON.
ON
MORE
THAN
11
MORE
THAN
11
MORE
THAN
11
LESS
THAN
1.0
MORE
THAN
11
LESS
THAN
1.0
RELAY CONTACTS NOT CLOSING.
REPLACE RELAY.
ON
MORE
THAN
11
MORE
THAN
11
0
LESS
THAN
1.0
00
WIRING OPEN BETWEEN BODY
CONTROL MODULE AND REAR
WINDOW DEFOGGER RELAY, OR,
DEFECTIVE BODY CONTROL
MODULE.
ON
MORE
THAN
11
MORE
THAN
11
0
MORE
THAN
11
00
POOR CONNECTION BETWEEN
PIN 3 OF RELAY AND POSITIVE
CONNECTION ON REAR WINDOW
DEFOGGER GRID CIRCUIT.
ON
MORE
THAN
11
MORE
THAN
11
MORE
THAN
11
LESS
THAN
1.0
00
POOR CONNECTION TO GROUND
ON NEGATIVE SIDE OF REAR
WINDOW DEFOGGER GRID.
ON
MORE
THAN
11
MORE
THAN
11
MORE
THAN
11
LESS
THAN
1.0
MORE
THAN
11
MORE
THAN
11
POOR WIRING CONNECTION
BETWEEN PINS 1 TO 2 OF THE
REAR WINDOW DEFOGGER
RELAY.
ON
MORE
THAN
11
00000
OPEN FUSE OR OPEN WIRING
CONNECTION TO PIN 1 OF REAR
WINDOW DEFOGGER RELAY.
ON 000000
RELAY CONTACTS SHORTED.
REPLACE RELAY. REAR WINDOW
DEFOGGER WILL NOT TURN OFF.
OFF
MORE
THAN
11
MORE
THAN
11
MORE
THAN
11
MORE
THAN
11
MORE
THAN
11
0
SERVICE PROCEDURES
REPAIR GRID LINES, TERMINALS AND
PIGTAILS
The repair of the grid lines or the terminal is pos-
sible using the Mopart Repair Package or equivalent.
(1) Mask repair area so conductive epoxy can be
extended onto the line or the bus bar (Fig. 5).
(2) Follow instructions in repair kit for preparing
damaged area.
(3) Remove package separator clamp and mix plas-
tic conductive epoxy thoroughly. Fold in half and cut
center corner to dispense epoxy.
(4) For grid line, mark off area to be repaired with
masking tape or a template (Fig. 5).
(5) Apply conductive epoxy through slit in masking
tape. Overlap both ends of the break by 19 mm (3/4
inch).
(6) For a terminal or pigtail replacement, mask
adjacent areas so epoxy can be extended onto line as
well as bus bar. Apply a thin layer of epoxy to area
where terminal was fastened and to adjacent line.
8N - 4 ELECTRICALLY HEATED SYSTEMS LH
DIAGNOSIS AND TESTING (Continued)
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