Ford 2003 Mustang Workshop Manual page 3463

Pinpoint Tests
PINPOINT TEST L: THE PARKING, REAR OR LICENSE LAMPS ARE
INOPERATIVE
L1 CHECK THE VOLTAGE TO THE HEADLAMP SWITCH
Disconnect: Headlamp Switch C205.
Measure the voltage between headlamp switch C205 Pin
B2, Circuit 195 (TN/WH), harness side and ground.
Is the voltage greater than 10 volts?
L2 CHECK CIRCUIT 14 (BN) FOR OPEN
Measure the resistance between headlamp switch C205
Pin R, Circuit 14 (BN), harness side and ground.
Is the resistance less than 5 ohms?
PINPOINT TEST M: ONE OR MORE PARKING, REAR OR LICENSE
LAMP(S) IS INOPERATIVE
M1 CHECK THE VOLTAGE TO THE INOPERATIVE
LAMP(S)
Key in OFF position.
Disconnect: Inoperative Lamp.
Place the headlamp switch in the parking lamps
ON position.
Measure the voltage between inoperative lamp
connector Circuit 14 (BN), harness side and
ground.
Is the voltage greater than 10 volts?
Test Step
Test Step
Result / Action to Take
Yes
GO to L2 .
No
REPAIR the circuit. TEST the
system for normal operation.
Yes
INSTALL a new headlamp
switch; REFER to
Switch—Headlamp
system for normal operation.
No
REPAIR the circuit. TEST the
system for normal operation.
Result / Action to Take
Yes
REPAIR Circuit 1205 (BK) for an open.
TEST the system for normal operation.
No
REPAIR the circuit. TEST the system
for normal operation.
Lamp
. TEST the