Ford 2003 Mustang Workshop Manual page 3292

Is the resistance greater than 10,000 ohms?
O9 CHECK CIRCUIT 128 (VT/YE) FOR SHORT TO BATTERY
Key in OFF position.
Disconnect: GEM C201e.
Disconnect: Instrument Cluster C220b.
Key in ON position.
Measure the voltage between the GEM C201e pin 13, circuit
128 (VT/YE), harness side and ground.
Is any voltage indicated?
O10 CHECK CIRCUIT 128 (VT/YE) FOR AN OPEN
Key in OFF position.
Measure the resistance between the GEM C201e pin 13,
circuit 128 (VT/YE), harness side and the instrument cluster
C220b pin 14, circuit 128 (VT/YE), harness side.
Is the resistance less than 5 ohms?
O11 CHECK THE BRAKE FLUID LEVEL SWITCH FOR AN
INTERNAL GROUND
Key in OFF position.
Disconnect: Brake Fluid Level Switch C124.
Key in ON position.
With the parking brake released, observe the BRAKE
warning indicator.
Is the BRAKE warning indicator always on?
No
REPAIR the circuit. TEST
the system for normal
operation.
Yes
REPAIR the circuit. TEST
the system for normal
operation.
No
GO to O10 .
Yes
GO to O15 .
No
REPAIR the circuit. TEST
the system for normal
operation.
Yes
GO to O12 .
No
INSTALL a new brake fluid
level switch. TEST the
system for normal
operation.