TESTING WITH SCAN TOOL
If using the scan tool, refer to the proper Body
Diagnostic Procedures Manual.
TESTING WITHOUT SCAN TOOL
(1) Remove the control switch from console and do
not disconnect control switch (Fig. 4).
(2) Using a ohmmeter, check leads between Pins 5
and 8 of the 8-way connector. Depress the rear win-
dow defogger button and the resistance reading
should be 500 to 520 ohms. If not OK, replace HVAC.
If OK, check:
• Rear window relay (EBL)
• Blown fuse
• Cut wire
• Poor ground
• Poor connection
• Defective BCM
• Bulkhead connector inoperative
Refer to Group 8W, Wiring Diagrams.
REAR WINDOW DEFOGGER RELAY
(1) Check fuses.
(a) Fuse 15 in the Junction Block
(b) Fuse 8 and 12 in the Power Distribution
Center.
(2) Remove the rear window defogger relay (EBL)
from the Junction Block (Fig. 5).
(3) Using voltmeter, test battery voltage:
(a) Test rear window defogger relay terminals 13
for battery voltage. If voltage is OK, go to Step b. If
voltage is not OK, repair A4 circuit.
(b) Test the rear window defogger relay terminal
for battery voltage with the key in the run posi-
tion. If voltage is OK, go to Step c. If voltage is not
OK, repair A31circuit.
(c) Use a known good relay. If not OK, repair cir-
cuits as necessary. Refer to Group 8W, Wiring Dia-
grams. If OK, replace relay.
SERVICE PROCEDURES
REPAIR GRID LINES, TERMINALS AND
PIGTAILS
WARNING: REPAIR KIT MAY CAUSE SKIN OR EYE
IRRITATION.
THE KIT CONTAINS EPOXY RESIN AND AMINE
TYPE HARDENER AND HARMFUL:
• DO NOT TAKE INTERNALLY, IF SWALLOWED
INDUCE VOMITING AND CALL A PHYSICIAN IMME-
DIATELY.
• IF CONTACTED WITH SKIN, WASH AFFECTED
AREAS WITH SOAP AND WATER.
• IF CONTACTED WITH EYES, FLUSH WITH
PLENTY OF WATER.
USE WITH ADEQUATE VENTILATION.
DO NOT USE NEAR FIRE OR OPEN FLAME THE
CONTENTS CONTAIN FLAMMABLE SOLVENTS.
KEEP OUT OF REACH OF CHILDREN.
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. 6).
(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.
Fig. 4 HVAC Control Module Connectors
Fig. 5 Rear Window Defogger Relay (EBL)
JA ELECTRICALLY HEATED SYSTEMS 8N - 3
DIAGNOSIS AND TESTING (Continued)
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