Ford 2003 Mustang Workshop Manual page 4066

Is the resistance less than 10 ohms?
N3 CHECK CIRCUIT 608 (BK/YE) FOR A SHORT TO GROUND
Key in OFF position.
Disconnect: Instrument Cluster C220a.
Measure the resistance to ground at instrument cluster C220a pin 12,
circuit 608 (BK/YE).
Is the resistance less than 100 ohms?
N4 CHECK CIRCUIT 608 (BK/YE) FOR AN OPEN
Disconnect: Instrument Cluster C220a.
Measure the resistance between RCM C2041 pin 20, circuit 608
(BK/YE), harness side and instrument cluster C220a pin 12, circuit
608 (BK/YE), harness side.
Yes
REPAIR the
circuit. GO to N6 .
No
GO to N4 .
Yes
REPAIR the
circuit. GO to N6 .
No
REPAIR the
instrument cluster.
GO to N6 .