Ford 2003 Mustang Workshop Manual page 3911

Are the resistances greater than 10,000 ohms?
A9 CHECK FOR PARKING BRAKE GROUND
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.
Are the resistances less than 5 ohms?
A10 CHECK THE PARKING BRAKE SWITCH
Disconnect: Parking Brake Switch C306.
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.
Are the resistances less than 5 ohms?
A11 CHECK THE CONVERTIBLE TOP MOTOR LOWER CIRCUIT
Connect: Raise Relay C4063.
Connect: Lower Relay C4064.
Disconnect: Convertible Top Motor C4062.
Measure the resistance between convertible top motor C4062,
circuit 902 (YE), harness side and ground.
Yes
GO to A11 . Yes
GO to A10 .
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.
Yes
GO to A13 .
No
GO to A12 .