Ford 2003 Mustang Workshop Manual page 3849

Is the voltage greater than 10 volts?
B4 CHECK THE DRIVER POWER DOOR LOCK SWITCH FOR
CORRECT OPERATION
Carry out the master window/door lock control switch component
test. REFER to Wiring Diagrams Cell 149, Component Testing.
Is the master window/door lock control switch OK?
B5 CHECK CIRCUITS 129 (LG) AND 1014 (VT) FOR SHORT TO
POWER
Key in OFF position.
Disconnect: GEM C201c.
Measure the voltage between GEM C201c Pin 20, Circuit 129 (LG),
harness side and ground; and between GEM C201c Pin 18, Circuit
1014 (VT), harness side and ground.
Key in ON position.
Measure the voltage between GEM C201c Pin 20, Circuit 129 (LG),
harness side and ground; and between GEM C201c Pin 18, Circuit
1014 (VT), harness side and ground.
Key in OFF position.
Are the voltages greater than 10 volts?
REPAIR Circuit 326
(WH/VT). REPEAT
the self-test. CLEAR
the DTCs.
Yes
GO to B5 .
No
INSTALL a new
master window/door
lock control switch.
REPEAT the self-
test. CLEAR the
DTCs.
Yes
REPAIR the circuit in
question. REPEAT
the self-test. CLEAR
the DTCs.
No
GO to B6 .