1991 FORD FESTIVA wiring

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INST RUMENT PANEL
1991 ACCESSORIES & SAFET Y EQUIPMENT Ford Motor Co. Switches & Instrum ent Panels - Standard
DESCRIPTION & OPERATION
Instrument panel on Capri contains a speedometer, tachometer, fuel, water temperature, oil pressure and voltmeter gauges. A boost gauge is
incorporated into the tachometer on turbo models. Instrument panel is equipped with indicator/warning lights for charging system, air b ag,
manual shift, seat belt, turn signals, high beam and brakes. A CHECK ENGINE light, located on instrument panel, illuminates if a
computerized engine control fault occurs with engine running.
Instrument panel on Festiva contains a speedometer, fuel and water temperature gauges. Instrument panel is equipped with indicator/warning
lights for charging system, oil pressure, seat belt, rear defogger, turn signals, high beam and brakes. A CHECK ENGINE light, located on
instrument panel, illuminates if a computerized engine control fault occurs with engine running.
TROUBLE SHOOTING
FUEL GAUGE
Fuel Gauge Always Reads Empty
If fuel gauge always reads empty, check these items:
Check fuel gauge for open or damaged wires.
Check for open ground at fuel gauge sending unit.
Check for defective fuel sending unit.
Check for defective fuel gauge.
Check for defective instrument panel voltage regulator (Festiva).
Check for blown 10-amp METER fuse in fuse panel.
Check for open in Black/Yellow power feed wire from fuse panel instrument panel.
Check for fuel tank float full of fuel (sunk).
Fuel Gauge Always Reads Full
If fuel gauge always reads full, check these items:
Check for fuel gauge Yellow wire shorted to ground.
Check for defective fuel sending unit.
Check for defective fuel gauge.
Check for defective instrument panel voltage regulator (Festiva).
Fuel Gauge Inaccurate
If fuel gauge is inaccurate, check these items:
Check for faulty (loose or corroded) wire connections.
Check for defective fuel sending unit.
Check for defective instrument panel voltage regulator (Festiva).
TEMPERATURE GAUGE
Temperature Gauge Always Reads Cold
If temperature gauge always reads cold, check these items:
Check temperature gauge for open wire.
Check for defective temperature sender.
Check for defective temperature gauge.
Check for defective instrument panel voltage regulator (Festiva).
Check for blown 10-amp METER fuse in fuse panel.
Check for open in Black/Yellow power feed wire from fuse panel to instrument panel.
Temperature Gauge Always Reads Hot
CAUT ION: On m odels with Supplem ental Restraint System (SRS), observe safety precautions. T he air bag system
is powered directly from the battery and back-up power supply. Before any repairs are perform ed,
disconnect and shield battery ground cable. Disconnect the back-up power supply BEFORE servicing
ANY air bag com ponent. Use caution when working near steering colum n. Air bag could accidentally
deploy at any tim e.
NOTE:Ensure continuity exists between chassis ground and Black wire of instrum ent panel connector,
especially if fault exists in m ultiple gauge circuits. See appropriate chassis wiring diagram in the
WIRING DIAGRAMS Section.
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TURBO BOOST GAUGE & SENSOR (CAPRI)
1. Disconnect 3-pin boost sensor electrical connected located on right side of firewall. Turn ignition on. Measure voltage between
Yellow/Green and Black wires. Voltage should be greater than 10 volts. Turn ignition off. If voltage is greater than 10 volts, go t o n e xt
step. If voltage is 10 volts or less, repair Yellow/Green or Black wires as necessary.
2. Remove instrument panel. See INSTRUMENT PANEL
under REMOVAL & INSTALLATION. Disconnect instrument panel 8-pin
connector. With boost sensor disconnected, measure resistance through White/Black between instrument panel and boost sensor harness
connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair or replace White/Black wire.
3. With 8-pin instrument panel connector disconnected, ground White/Black at boost gauge. Boost gauge should read low. Apply 12 vo l t s
to White/Black wire at boost gauge. Boost gauge should read high. If boost gauge operates as specified, go to next step. If boost gauge
does not operate as specified, replace boost gauge.
4. Reconnect instrument panel connectors (if removed). With ignition on and boost sensor disconnected, install jumper wire between
Yellow/Green and White/Black wires of boost sensor vehicle harness connector. Boost gauge should read high. If boost gauge reads
high, replace boost sensor. If boost gauge does not read high, go to TROUBLE SHOOTING
for other possible causes.
REMOVAL & INSTALLATION
INSTRUMENT PANEL
Removal & Installation (Capri)
1. Disconnect negative battery cable. Pull storage compartment from heater/radio bezel. Pull outward and remove trim covers located on
both sides of steering column. Remove retaining screws and carefully pull instrument panel bezel partially away from dash. Disconnect
electrical connectors from clock and switches in bezel. Remove instrument panel bezel.
2. Disconnect speedometer cable from transaxle. Remove instrument panel retaining screws and slide instrument panel outward. Press lock
tab and release speedometer cable from instrument panel. Remove electrical connectors from rear of instrument panel. Remove
instrument panel. To install instrument panel, reverse removal procedure.
Removal & Installation (Festiva)
1. Disconnect negative battery cable. Remove upper and lower steering column covers. Remove screws from panel bezel and remove bezel.
Disconnect rear wiper switch and rear defogger switch wiring harness connectors (if equipped).
2. Remove instrument panel-to-dash screws. Pull panel from dash. Reach behind panel and release speedometer drive cable lock tab. Lift
lock tabs and disconnect 2 electrical connectors from rear of panel. Remove panel. To install instrument panel, reverse removal
procedure.
INDICATOR LIGHTS
Removal & Installation
Remove instrument panel for access to indicator light bulbs. See INSTRUMENT PANEL under REMOVAL & INSTALLATION. To remove
bulb, rotate bulb counterclockwise to disengage locking tabs. When tabs release, pull bulb from printed circuit board. To install bulb, reverse
removal procedure. Install instrument panel and test lights.
SPEEDOMETER R & I
Removal & Installation (Capri)
R e mo ve n e ga t ive b a t t e r y c a b l e . R e mo ve in st r u me n t p a n e l . S e e INSTRUMENT PANEL under REMOVAL & INSTALLATION. Disassemble
instrument panel and remove speedometer/tachometer/boost gauge assembly from instrument panel. To install, apply a 3/16" (4.6 mm) b al l o f
Silicone Damping Grease (D7AZ-19A331-A) into drive hole of speedometer head. Reverse removal procedure to complete installation.
Removal & Installation (Festiva)
R e mo ve n e ga t ive b a t t e r y c a b l e . R e mo ve in st r u me n t p a n e l . S e e INSTRUMENT PANEL under REMOVAL & INSTALLATION. Disassemble
instrument panel and remove speedometer head assembly from instrument panel. Speedometer is a separate module and can be removed
independently from gauges. To install, reverse removal procedure.
SPEED SENSOR
On vehicles equipped with speed control, a speed sensor is mounted in speedometer head assembly. If replacement is necessary, speedometer
head assembly must be replaced. See SPEEDOMETER R & I
under REMOVAL & INSTALLATION.
FUEL GAUGE
Removal & Installation
Remo ve in st ru men t p an el . See INSTRUMENT PANEL under REMOVAL & INSTALLATION. Disassemble panel and remove fuel gauge.
To install gauge, reverse removal procedure. On Capri, the fuel/volt gauge must be replaced as an assembly.
FUEL SENDING UNIT
Removal & Installation
1. For Festiva, remove rear seat. For Capri, remove rear seat cushion. On Festiva, remove carpet hold-down pins and lift carpet for access
to sending unit access plate. On all models, remove access plate screws. NOTE:Federal law requires that a label stating the odom eter has been repaired or replaced be affixed to any
vehicle that has its odom eter repaired, replaced or set to zero.
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2. Lift access plate and disconnect sending unit wiring. To relieve fuel pressure, start engine and run it until engine stalls. Turn ignition off.
Disconnect and plug fuel lines at sending unit. Remove sending u n it a t t a c h in g sc r e ws. R e mo ve se n d in g u n it . To in st a l l , r e ve r se removal
procedure.
TACHOMETER
Removal & Installation
Remo ve in st ru men t p an el . See INSTRUMENT PANEL under REMOVAL & INSTALLATION. Disassemble panel and remove tachometer.
To install tachometer, reverse removal procedure. On Capri, the tachometer/speedometer/boost gauge assembly must be replaced as an
assembly.
TEMPERATURE GAUGE
Removal & Installation
Remo ve in st ru men t p an el . See INSTRUMENT PANEL under REMOVAL & INSTALLATION. Disassemble panel and remove temperature
gauge. To install gauge, reverse removal procedure. On Capri, the temperature/oil pressure gauge assembly must be replaced as an assembly.
TEMPERATURE SENDING UNIT
Removal
Disconnect sending unit wire, located on side of block below thermostat housing (Festiva) or cylinder head (Capri). Remove radiator cap to
relieve cooling system pressure. Position drain pan below sending unit. Remove temperature sending unit.
Installation
To install, apply Pipe Sealant With Teflon (D8AZ-19554-A) to threads of sending unit. Reverse removal procedure to complete installation.
Fill cooling system to proper level. Start engine and check for coolant leaks at sending unit.
WIRING DIAGRAMS
CAUT ION: T achom eter is calibrated at factory. Rough handling could disturb calibration.
NOTE:Refer to the appropriate WIRING DIAGRAMS article in the WIRING DIAGRAMS section.
Copyr ight 2009 Mitchell Repair Information Company, LLC. All Rights Reserved.
Article GUID: A00028301
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DEFOGGER - REAR WINDOW
1991 ACCESSORIES & SAFET Y EQUIPMENT Rear Window Defoggers - Rear Window
DESCRIPTION & OPERATION
The rear window defogger consists of an electrical grid on rear window glass. The rear window defogger switch is located in the instrument
cluster bezel. On Capri, the switch is a push type and includes a small indicator light in the switch to indicate when rear defogger is on. On
Festiva, the switch is a rocker type and includes a small indicator light in instrument cluster to indicate when rear defogger is on.
On Capri, the defogger circuit includes a 10-amp METER fuse which receives battery power from ignition switch and a 20-amp HTD B-
LIGHT fuse which has battery power at all times. The wire from the METER fuse goes to the rear defogger switch and then to the relay. The
wire from the HTD B-LIGHT fuse goes to the rear defogger relay and then to the grid. See Fig. 1
.

Fig. 1: Rear Window Defogger Wiring Diagram (Capri)

Courtesy of FORD MOTOR CO.
On Festiva, the defogger circuit includes a 15-amp DEFOG fuse which receives battery power from ignition switch. The wire from the fuse
goes to the rear defogger switch and then to the grid. The defogger circuit does not contain a relay. See Fig. 2
.
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Fig. 2: Rear Window Defogger Wiring Diagram (Festiva)
Courtesy of FORD MOTOR CO.
TROUBLE SHOOTING
DEFOGGER DOES NOT OPERATE
Blown fuse(s) or poor contact. Defogger switch defective. Defogger relay defective. Poor connections. Broken wire. Defective grid filament.
INDICATOR LIGHT DOES NOT WORK BUT DEFOGGER DOES WORK
Open circuit from rear defogger switch to instrument panel (Festiva). Defective light bulb. Defective flexible circuit on instrument cluster.
TESTING
SYSTEM TESTING
1. Ensure all in-line fuses or circuit breakers are okay. Turn ignition and control switches to ON position. Glass should feel warm after a
few min u t es.
2. If glass is not warm, use a test light or voltmeter to check for battery voltage at grid feed wire. If voltage is not correct, check wiring
harness, control switch and flexible circuit on instrument cluster. See FILAMENT TESTING.
REAR DEFOGGER SWITCH TESTING
Capri
Remove rear defogger switch. Using an ohmmeter, ensure continuity exists between terminals listed in table at specified switch positions. If
switch does not test as specified, replace rear defogger switch. See REAR DEFOGGER SWITCH CONTINUITY (CAPRI) table.
REAR DEFOGGER SWITCH CONTINUITY (CAPRI)
Festiva
Remove rear defogger switch. Using an ohmmeter, ensure continuity exists between terminals listed in table at specified switch positions. If
switch does not test as specified, replace rear defogger switch. See REAR DEFOGGER SWITCH CONTINUITY (FESTIVA) table. See Fig.
3 .
REAR DEFOGGER SWITCH CONTINUITY (FESTIVA)

Fig. 3: Identifying Rear Defogger Switch Terminals (Festiva)

Courtesy of FORD MOTOR CO.
REAR DEFOGGER RELAY TESTING
Unplug rear window defroster relay. Relay is located in left rear corner of luggage compartment. Apply battery voltage and ground to NOTE:On Capri, if indicator light is not working, replace switch.
TerminalPositionContinuity
BLK/YEL - BLK/WHTOffNo
BLK/YEL - BLK/WHTOnYes
TerminalPositionContinuity
BLK/WHT - BLK/BLUOffNo
BLK/WHT - BLK/BLUOnYes
RED/GRN - BLKOffNo
RED/GRN - BLKOnYes
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Black/White and Black wire terminals of relay. Check continuity of relay across 2 Black/Yellow wire terminals of relay. Continuity should
exist when relay is energized. When relay is de-energized, continuity should not exist.
FILAMENT TESTING
1. To locate breaks in grid wire filaments, attach a voltmeter to middle portion of each filament. Attach other meter probe to vertical
section of window grid.
2. If a grid is broken, meter will register either zero volt or battery voltage, depending on if grid is broken between or outside test leads. If
wire is not broken, meter will register about one half of battery voltage. To locate break, move probe along wire until meter needle
mo ves ab ru p t l y.
REMOVAL & INSTALLATION
REAR DEFOGGER SWITCH
Removal & Installation (Capri)
1. Disconnect negative battery cable. Pull out center storage compartment. Remove 2 nuts, 2 lower screws, and heater/radio bezel. Pull
outward and remove 2 trim covers, one located on each side of steering column.
2. Remove instrument panel bezel retaining screws and pull instrument bezel from dash. Disconnect electrical connector from rear
defogger switch. Depress tangs on both sides of switch and remove switch. To install, reverse removal procedure.
Removal & Installation (Festiva)
Disconnect negative battery cable. Remove steering column covers. Remove screws securing instrument panel bezel to instrument panel. Pull
instrument bezel away from instrument panel. Disconnect electrical connectors from switches in bezel. Compress rear defogger switch lock
tabs and remove switch from bezel. To install, reverse removal procedure.
WIRING DIAGRAMS
See appropriate chassis wiring diagram in the WIRING DIAGRAMS Section.
Copyr ight 2009 Mitchell Repair Information Company, LLC. All Rights Reserved.
Article GUID: A00028302
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1990-92 ACCESSORIES & EQUIPMENT
Power Mirrors - Festiva
DESCRIPTION & OPERATION
The power outside rearview mirrors are an aerodynamic sail-mount design. See Fig. 1 . The mirror base is secured to the lower front corner of
the window frame. The screws attaching the base to the door and the wiring connector are concealed behind a trim cover which is also
attached to the window frame.
The power outside rearview mirrors are operated by a switch located to the left of the steering column just below the air discharge register. See
Fig. 1
. The switch housing actually contains two separate switch assemblies. The outer perimeter switch controls the up/down and the
inboard/outboard position of the mirrors. The center toggle switch determines which mirror is connected to the perimeter switch. When the
toggle is positioned to the left mirror, the left mirror will respond to the perimeter switch. The right mirror responds when the toggle is
positioned to the right.
Each mirror contains two electric motors -- one for tilting the mirror up or down and another for moving the mirror inboard or outboard. See
Fig. 1
. Each motor drives a gear train that includes a worm gear, a reduction gearset, and a threaded attaching lug. Rotation of the gear train
threads the attaching lug in or out of the final gear in the train. As the lug moves in the gear, it pushes or pulls the mirror into a new position.
A spring clip installed over the lug allows it to ratchet when it reaches the end of its travel.

Fig. 1: Identifying Power Rear View Mirror Components

Courtesy of FORD MOTOR CO.
COMPONENT LOCATIONS
COMPONENT LOCATIONS
ComponentLocation
Fuse PanelLeft Side Of Instrument Panel, Left Of Steering Column. See .
Ground G201Far Left Side Of Instrument Panel, Above Kick Panel. See .
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2. Disconnect the wiring at the mirror.
3. Remove the attaching screws and the mirror.
4. Remove the seal from the mirror. See Fig. 9
.
Installation
To install, reverse the removal procedure.

Fig. 9: Removing & Installing Power Rear View Mirror

Courtesy of FORD MOTOR CO.
REMOTE MIRROR SWITCH
Removal
1. Remove the left radio speaker grille by carefully prying it up with a screwdriver.
2. Remove the four speaker attaching screws and the radio speaker. See Fig. 10
.
3. Using a screwdriver, pry at the bottom of the switch casing to loosen the remote mirror switch. See Fig. 11
. To prevent marring the
instrument panel, place a pad or clean rag between the blade and the instrument panel.
4. Reach through the speaker opening and disconnect the electrical connector.
5. Remove the remote mirror switch.
Installation
To install, reverse the removal procedure.
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