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Fordace
March 6th, 2007, 12:08 PM
HEATED WINDSHIELD—CONVERSION TO CONVENTIONAL GLASS
1988-1992 Continentals

Disconnect (-) negative battery terminal.
Refer to the corresponding vehicle’s EVTM to
locate the appropriate Heated Windshield
Control Module (18C531) and Alternator Output
Control Relay/Heated Windshield Relay
(18D414).
Locate the Heated Windshield Control Module
(18C531), unplug connector.
Locate terminal #1 (Figure 1), remove terminal
locking tabs, remove wire/terminal from the #1
terminal location, and re-install terminal locking
tab.
Wrap electrical tape securely around wire
terminal to insulate from contact with an
electrical ground. Fold back wire to harness
and securely tape to harness to prevent
movement. Plug connector back into the
Heated Windshield Control Module (18C531).
Locate the Alternator Output Control
Relay/Heated Windshield Relay (18D414) and
remove the 16 gauge wire with the moulded
insulator cap connected to the “MOD” terminal
(Figure 2).
Wrap electrical tape securely around the
moulded insulator cap to insulate from contact
with an electrical ground. Fold back wire to
harness and securely tape to harness to
prevent movement.
Remove the wire/eyelet end from the terminals
marked “BAT” and “ALT” on the (18D414) relay.
a. Clean eyelet ends to ensure a good
electrical connection.
b. Install both wire/eyelets to the “ALT” stud on
the (18D414) relay (Figure 2). Invert “ALT”
eyelet for proper mating and seating.
c. Torque “ALT” terminal nut to 3.4 N•m (30
lb-in).
d. Apply electrical sealant compound to
connection.
Reconnect (-) negative battery terminal.
The heated windshield is now
deactivated. When pressing the Electrical Heated Windshield “ON” button, the “ON” indicator will not illuminate. Also check for generator voltage at the battery with the vehicle at idle. Voltage should be between 13.0V to
15.0V. If not, see the corresponding vehicle’s
Service Manual for troubleshooting.
Trying to get pics added soon...:cool:

DustyLBottoms
March 13th, 2007, 02:24 PM
Thanks for posting this FordAce! I had this done for my Conti 5 years ago - the OEM glass was just too expensive. I'll sticky this for quick reference.

Lord_Iffy
January 9th, 2010, 07:17 AM
Great info. Could I ask you where can I find the relay? What shop manual says is not much helpful.. How can I get to the relay? I have no idea where on the RH fender shall I look for it. Thank you

Fordace
January 10th, 2010, 10:33 PM
If I remember correctly, the heated windshield relay should be up under the r/f fender area, very prone to water ingestion.

Lord_Iffy
February 3rd, 2010, 01:05 PM
Thank you very much, I have found it and dissabled according to the info above and it looks everything works OK. However it took me little time to find it, maybe this picture could help someone - it is located here:

http://resize.like.cz/images/1265223944HWS.JPG