Ford 2003 Mustang Workshop Manual page 3448

Are the voltages greater than 10 volts?
B2 CHECK CIRCUIT 13 (RD/BK) FOR OPEN
Disconnect: Multifunction Switch C202a.
Measure the resistance between multifunction switch C202a
Pin 13, Circuit 13 (RD/BK), harness side and CJB Fuse 4
and Fuse 10.
Are the resistances less than 5 ohms?
PINPOINT TEST C: THE HIGH BEAMS ARE INOPERATIVE
C1 CHECK THE CIRCUIT 12 (LG/BK)
Disconnect: LH Headlamp C1021.
Measure the resistance between LH headlamp C1021 Pin
2, Circuit 12 (LG/BK), harness side and CJB Fuse 38 (20A).
Is the resistance less than 5 ohms?
C2 CHECK THE VOLTAGE TO CJB FUSE 38 (20A)
Place the headlamp switch in the ON position.
Place the multifunction switch in the high beam position.
Measure the voltage between CJB Fuse 38 (20A) and
ground.
Test Step
Yes
INSTALL a new
multifunction switch;
REFER to Section 211-05
TEST the system for normal
operation.
No
REPAIR the circuit. TEST
the system for normal
operation.
Result / Action to Take
Yes
RECONNECT the LH
headlamp (13008). GO to
C2 .
No
REPAIR the circuit. TEST
the system for normal
operation.
Yes
Go To Pinpoint Test E
No
.
.