Ford 2003 Mustang Workshop Manual page 3066

Is the voltage reading greater than 10 volts?
C8 CHECK CIRCUIT 883 (PK/LB) FOR A SHORT TO
GROUND
Key in OFF position.
Measure the resistance between the function selector
switch C294c-2, circuit 883 (PK/ LB) harness side and
ground.
Is the resistance less than 5 ohms?
C9 CHECK CIRCUIT 348 (VT) FOR SHORT TO GROUND
Disconnect: A/C Cycling Switch C130.
Measure the resistance between the function selector
switch C294c-4, circuit 348 (VT) harness side and
ground.
Is the resistance reading less than 10,000 ohms?
C10 CHECK FOR A SHORTED FUNCTION SELECTOR
SWITCH
Connect: Function Selector Switch C294c.
Measure the resistance between the A/C cycling switch
C130-4, circuit 348 (VT) harness side and ground.
Yes
GO to C9 .
No
GO to C11 .
Yes
REPAIR circuit 348 (VT). TEST
the system for normal
operation.
No
GO to C10 .
Yes
INSTALL a new function
selector switch. REFER to
Section 412-04 . TEST the
system for normal operation.
No
GO to C13 .