Taurus/Sable
1989 Taurus/Sable
36-86-1 Window, Rear-Defroster 36-86-1
SECTION 36-86 Window, Rear-Defroster
SUBJECT PAGE
DESCRIPTION AND OPERATION 36-86-1
MAJOR SERVICE OPERATIONS
Grid Wire Repair 36-86-2
Application 36-86-3
Curing 36-86-3
Mixing 36-86-2
Surface Preparation 36-86-2
Lead Wire Terminal Service 36-86-3
SUBJECT PAGE
REMOVAL AND INSTALLATION
Switch 36-86-4
Window 36-86-4
SPECIAL SERVICE TOOLS 36-86-4
TESTING
Grid Wire Test 36-86-4
Relay Tests 36-86-4
VEHICLE APPLICATION 36-86-1
VEHICLE APPLICATION Taurus/Sable.
DESCRIPTION AND OPERATION
The heated rear window defroster system consists of a switch and relay control assembly mounted to the instrument panel and a series of grid wires baked on the inside surface of the rear window. When the control switch is activated by the rocker or push button, current is directed to the grid wires on the rear window. The heated grid wires keep the rear window clear of fog or ice.
The integral timer automatically turns off tile heating grid after approximately 10 minutes of operation. If more than 10 minutes of use is needed, the grid can be reactivated for another 10 minutes by pushing the rocker or push button to the ON position. This operation can be repeated as required. Power for the control timer and relay coil comes from the RUN terminal of the ignition switch and from a wire containing a fuse link connected to the starter relay.
1989 Taurus/Sable
36-86-2 Window, Rear-Defroster
36-86-2
DESCRIPTION AND OPERATION (Continued)
The rear window defrost grid is fed through the relay contacts from the fuse link wire. The input to the rear defrost control assembly from the ignition switch determines if the relay contacts will stay closed when activated by the ON-OFF rocker or buttons. When the ignition switch is in RUN position, moving the rocker or button to ON closes the relay contacts and also activates the timing circuit. The relay contacts will remain closed until they are opened by
the timing circuit, the rocker or button is depressed to the OFF position, or the ignition is turned to the OFF position. The circuit is protected by a fuse located in tile ruse panel and a fuse link. The operating rocker (Taurus) or buttons (Sable) are spring-loaded to return from ON or OFF to its center (normal) position.
As soon as the switch is depressed to the ON position, it electrically connects power to energize the timer relay coil, causing the normally open relay load contacts to close and provide power to the ON lamp and the rear window grid wires. The grid wires will continue to receive power for approximately 10 minutes.
The control can be deactivated before automatic time out by momentarily depressing it to the OFF position or when the ignition switch is turned to the OFF position. For individual wiring liarness applications, refer to Section 34-20.
MAJOR SERVICE OPERATIONS
Grid Wire Repair
NOTE: A single break or any breaks that total more than 25 mm (1 inch) in one grid cannot be repaired. The rear window must be replaced. For breaks less than 25 mm (1 inch) long, use the following procedure:
Surface Preparation
1. The vehicle should be brought inside and permitted to come to room temperature of 16~C (60~F) or above.
2. Clean entire grid line repair area with Ultra Clear Spray Glass Cleaner E4AZ-19C507-AA (ESR-
M1495-A) or equivalent, to remove all dirt, wax, grease, oil or other foreign matter. It is important that repair area be clean and dry. Mixing The bottle of Grid Repair Compound D8AZ-19562-A (ESB-M4J58-A) or equivalent and touch-up paint must be at room temperature. Shake bottle for at least one minute for thorough mixing. Shake frequently during use.