Ford 2003 Mustang Workshop Manual page 3910

circuit 588 (VT), harness side.
Is the resistance less than 5 ohms?
A6 CHECK CIRCUIT 688 (GY/LB) FOR OPEN
Key in OFF position.
Disconnect: Convertible Top Switch C3115.
Measure the resistance between convertible top switch C3115 pin
5, circuit 688 (GY/LB), harness side and lower relay C4064 pin 85,
circuit 688 (GY/LB), harness side.
Is the resistance less than 5 ohms?
A7 CHECK THE BATTERY SUPPLY TO THE RELAYS
Measure the voltage between raise relay C4063 pin 87, circuit 170
(RD/LB), harness side and ground; and between lower relay
C4064 pin 87, circuit 170 (RD/LB), harness side and ground.
Are the voltages greater than 10 volts?
A8 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
Key in OFF position.
Measure the resistance between raise relay C4063 pin 87A,
circuit 1205 (BK), harness side and ground; and between lower
relay C4064 pin 87A, circuit 1205 (BK), harness side and ground.
Top Switch in this
section. TEST the
system for normal
operation.
No
REPAIR Circuit 588
(VT). TEST the
system for normal
operation.
Yes
INSTALL a new
convertible top switch.
REFER to Convertible
Top Switch in this
section. TEST the
system for normal
operation.
No
REPAIR circuit 688
(GY/LB). TEST the
system for normal
operation.
Yes
GO to A8 .
No
REPAIR circuit 170
(RD/LB). TEST the
system for normal
operation.
Yes
GO to A9 .
No
REPAIR the circuit.
TEST the system for
normal operation.