Ford 2003 Mustang Workshop Manual page 3072

Is the voltage greater than 10 volts?
C23 CHECK CIRCUIT 331 (PK/YE) FOR AN OPEN.
Key in OFF position.
Disconnect: CCRM C1262.
Key in ON position.
Enter the following diagnostic mode on the diagnostic
tool:
In the Active Command Mode command the PCM
outputs ON.
Measure the resistance between the CCRM C1262-22,
circuit 331 (PK/YE), harness side and ground.
Is the resistance reading less than 5 ohms?
C24 CHECK CIRCUIT 347 (BK/YE)
Key in OFF position.
Measure the resistance between CCRM C1262-23,
circuit 347 (BK/YE), harness side and A/C clutch C100-
1, harness side.
Is the resistance less than 5 ohms?
C25 CHECK CIRCUIT 347 (BK/YE) FOR A SHORT TO
GROUND.
Measure the resistance between A/C clutch C100-2,
circuit 1205 (BK), harness side and the CCRM C1262-
16, circuit 1205 (BK) harness side.
Yes
GO to C24 .
No
REPAIR circuit 331 (PK/YE) for
an open. TEST the system for
normal operation.
Yes
GO to C25 .
No
REPAIR circuit 347 (BK/YE) for
an open. TEST the system for
normal operation.
Yes
INSTALL a new constant
control relay module. TEST the
system for normal operation.