2003 FORD MUSTANG parking brake

DIAGNOSIS AND TESTING
Convertible Top
Refer to Wiring Diagrams Cell
103 , for schematic and connector information.
Principles of Operation
The convertible top will only operate with the parking brake engaged and the ignition switch in the RUN
position. When the parking brake is engaged, the raise and lower relay coils are grounded through the
parking brake switch. The convertible top switch supplies power to the raise or lower relay coil when
raise or lower is selected. This power energizes the coil causing the relay contacts to close which
supplies battery power to the convertible top motor/pump assembly. The normal state of the relay is
connected to ground. When the raise or lower relay is operating, the other relay remains in its normal
state supplying the motor/pump ground.
Convertible Top Adjustments
The convertible top adjustments must be made by a qualified technician.
Inspection and Verification 1. Verify the customer concern by operating the system.
2. Visually inspect for obvious signs of mechanical or electrical damage.
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. If the concern is not visually evident, verify the symptom and refer to the Symptom Chart.
SECTION 501-
18: Convertible Top 2003 Mustang Workshop Manual Special Tool(s)
73 III Automotive Meter
105-
R0057 or equivalent
Visual Inspection Chart Mechanical Electrical
z
Convertible top brackets and
frame
z Hydraulic motor and pump
z Hydraulic lift cylinders
z Door and quarter window glass
adjustment z
Central junction box (CJB) Fuse 20 (15A)
z Battery junction box (BJB) circuit breaker
CONV TOP (30A)
z Wiring harness
z Loose or corroded connections
z Raise or lower relays
z Parking brake switch
z Convertible top switch Klj . 1 ba
102003 Mustang Workshop Manual
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Symptom Chart
PINPOINT TEST A: THE CONVERTIBLE TOP DOES NOT
RAISE/LOWER
SYMPTOM CHART Condition
Possible Sources Action
z The convertible top does not
raise/lower z
Convertible top
switch.
z Central junction box
(CJB) Fuse 20 (15A).
z Parking brake switch.
z Lower relay.
z Raise relay.
z Circuitry. z
Go To Pinpoint Test
A .
z The convertible top
hesitates/comes up uneven z
Convertible top
adjustment.
z Hydraulic lift
cylinders.
z Hydraulic system. z
Go To Pinpoint Test
B .
z The convertible top does not
raise or does not go up all the
way z
Convertible top
adjustment.
z Hydraulic lift
cylinders.
z Hydraulic system. z
Go To Pinpoint Test
C .
z The convertible top hydraulic
system z
Convertible top
adjustment.
z Hydraulic lift
cylinders.
z Hydraulic motor/pump
assembly.
z Hydraulic system. z
Go To Pinpoint Test
D .
Test Step Result / Action to
Take A1 CHECK THE CONVERTIBLE TOP OPERATION
NOTE:
The parking brake must be applied for the convertible top
system to operate.
z Key in ON position.
z Depress the convertible top switch in RAISE and LOWER
positions while listening for motor operation.
z Does the convertible top motor assembly operate in both
directions? Yes
Go To Pinpoint Test
C .
No
GO to A2 .
A2 CHECK THE POWER SUPPLY TO THE CONVERTIBLE TOP
SWITCH z
Key in OFF position.
z Disconnect: Convertible Top Switch C3115.
z Key in ON position.
z Measure the voltage between convertible top switch C3115 pin 4,
circuit 296 (WH/PK), harness side and ground. Yes
GO to
A3 .
No
REPAIR circuit 296
(WH/PK). TEST the
system for normal
operation. Klj . 2 ba
102003 Mustang Workshop Manual
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z
Are the resistances greater than 10,000 ohms? A9 CHECK FOR PARKING BRAKE GROUND
z
Measure the resistance between raise relay C4063 pin 86, circuit
977 (VT/WH), harness side and ground; and between lower relay
C4064 pin 86, circuit 977 (VT/WH), harness side and ground.
z Are the resistances less than 5 ohms? Yes
GO to
A11 .
Yes
GO to A10 .
A10 CHECK THE PARKING BRAKE SWITCH
z
Disconnect: Parking Brake Switch C306.
z Measure the resistance between raise relay C4063 pin 86, circuit
977 (VT/WH), harness side and parking brake switch C306, circuit
22 (LB/BK), harness side; and between lower relay C4064 pin 86,
circuit 977 (VT/WH), harness side and parking brake switch C306,
circuit 22 (LB/BK), harness side.
z Are the resistances less than 5 ohms? Yes
INSTALL a new
parking brake switch.
REFER to
Section 206 - 05 . TEST the
system for normal
operation.
No
REPAIR the circuit in
question. TEST the
system for normal
operation. A11 CHECK THE CONVERTIBLE TOP MOTOR LOWER CIRCUIT
z
Connect: Raise Relay C4063.
z Connect: Lower Relay C4064.
z Disconnect: Convertible Top Motor C4062.
z Measure the resistance between convertible top motor C4062,
circuit 902 (YE), harness side and ground. Yes
GO to
A13 .
No
GO to A12 . Klj . 5 ba
102003 Mustang Workshop Manual
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PINPOINT TEST B: THE CONVERTIBLE TOP HESITATES/COMES UP
UNEVEN z
Is the resistance less than 5 ohms? A15 CHECK CIRCUIT 903 (RD) FOR AN OPEN
z
Disconnect: Raise Relay C4063.
z Measure the resistance between raise relay C4063 pin 30, circuit
903 (RD), harness side and convertible top motor C4062, circuit
903 (RD), harness side.
z Is the resistance less than 5 ohms? Yes
INSTALL a new raise
relay. TEST the
system for normal
operation.
No
REPAIR the circuit.
TEST the system for
normal operation.
A16 CHECK THE RAISE INPUT TO THE MOTOR
z
Key in ON position.
z Depress and hold the convertible top switch in the RAISE position.
z Measure the voltage between convertible top motor C4062, circuit
903 (RD), harness side and ground.
z Is the voltage greater than 10 volts? Yes
INSTALL a new
convertible top motor;
REFER to
Hydraulic System, Lift Cylinder
and Motor in this
section. TEST the
system for normal
operation.
No
INSTALL a new raise
relay. TEST the
system for normal
operation. Test Step Result / Action to Take
B1 CHECK THE CONVERTIBLE TOP UP/DOWN
OPERATION NOTE:
The parking brake must be applied for the Yes Klj . 7 ba
102003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

PINPOINT TEST C: THE CONVERTIBLE TOP DOES NOT RAISE OR
DOES NOT GO UP ALL THE WAY
PINPOINT TEST D: THE CONVERTIBLE TOP HYDRAULIC SYSTEM convertible top system to operate.
z Key in ON position.
z Actuate the convertible top switch to the LOWER
and RAISE positions.
z Did the convertible top operate to the full down
and full up position without hesitating? ADJUST the convertible top linkage.
TEST the system for normal
operation.
No
GO to
B2 .
B2 CHECK THE MOTOR OPERATION
z
Gain access to the convertible top motor/pump
assembly.
z Operate the convertible top to the LOWER and
RAISE positions while listening to the motor.
z Did the motor stop and then continue at any
time? Yes
Go To Pinpoint Test A
.
No
GO to B3 .
B3 CHECK THE CONVERTIBLE TOP LINKAGE
z
Operate the convertible top to the LOWER and
RAISE positions while observing the convertible
top linkage.
z Did the linkage operate smoothly without
binding? Yes
Go To Pinpoint Test D
.
No
ADJUST the convertible top linkage.
TEST the system for normal
operation. Test Step Result / Action to Take
C1 CHECK THE CONVERTIBLE TOP OPERATION
NOTE:
The parking brake must be applied for the
convertible top system to operate.
z Key in ON position.
z Actuate the convertible top switch to the RAISE
position.
z Did the motor operate? Yes
GO to
C2 .
No
Go To Pinpoint Test A .
C2 CHECK THE CONVERTIBLE TOP LINKAGE
z
Operate the convertible top to the LOWER and
RAISE positions while observing the convertible
top linkage.
z Did the linkage bind and prevent the
convertible top from raising? Yes
ADJUST the convertible top linkage.
TEST the system for normal
operation.
No
Go To Pinpoint Test D
.
Test Step Result / Action to Take
D1 CHECK THE FLUID LEVEL
NOTE:
The fluid level should be even
with the bottom of the filler plug hole.
NOTE: Place an absorbent cloth
below the filler plug when checking
the fluid level.
z Remove the filler plug and check the Yes
GO to
D3 .
No
GO to D2 . Klj . 8 ba
102003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

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Moon Roof RelayPower Moon Roof
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Oxygen Sensor(s) (O2S)Engine Performance
Parking Brake SwitchAnalog Instrument Panels
Park LightsExterior Lights
Park/Neutral Position SwitchStarters; Engine Performance; Anti-Theft System;
Body Control Module
Perimeter Lighting Control RelayExterior Lights
Power AmplifierPower Antennas
Power Antenna ModulePower Antennas
Power Antenna MotorPower Antennas
Power Distribution CenterPower Distribution; Gene rators & Regulators;
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Power Door Lock MotorsPower Door Locks
Power Mirror MotorsPower Mirrors; Memory Systems
Power Sliding Door ControllerPower Sliding Side Door
Power Seat MotorsPower Seats; Memory Systems
Power Steering Pressure SwitchEngine Performance
Power Top MotorPower Convertible Top
Power Top Relay(s)Power Convertible Top
Powertrain Control ModuleEngine Performance; Analog Instrument Panels; Cruise Control Systems; Data Link Connectors;
Generators & Regulators; Starters
Power Window MotorsPower Windows
Power Window Relay(s)Power Windows
Radiator Fan Motor(s)Electric Cooling Fans
Radiator Fan Relay(s)Engine Performance; Electric Cooling Fans;
Rainsense ModuleWiper/Washer Systems
Raise RelayPower Convertible Top
Remote Anti-Theft Personality (RAP) ModuleAnti-Theft System; Starters; Warning Systems
Seat Belt PretensionersAir Bag Restraint System
Seat Belt Retractor SolenoidPassive Restraints
Seat Belt SwitchAir Bag Restraint System; Passive Restraints
Shift Interlock SolenoidShift Interlock Systems
Shift Lock ActuatorShift Interlock Systems
Side Marker LightsExterior Lights


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