Ford 2003 Mustang Workshop Manual page 3851

Key in ON position.
Measure the voltage between GEM C201c Pin 19, Circuit 119
(PK/YE), harness side and ground; and between GEM C201c Pin
17, Circuit 120 (PK/LG), harness side and ground.
Key in OFF position.
Are the voltages greater than 10 volts?
B10 CHECK CIRCUITS 119 (PK/YE) AND 120 (PK/LG) FOR OPEN
Measure the resistance between passenger window/door lock
control switch C629 Pin 2, Circuit 119 (PK/YE), harness side and
GEM C201c Pin 19, Circuit 119 (PK/YE), harness side; and
between passenger window/door lock control switch C629 Pin 4,
Circuit 120 (PK/LG), harness side and GEM C201c Pin 17, Circuit
120 (PK/LG), harness side.
Are the resistances less than 5 ohms?
B11 CHECK GEM CONTROL OF THE POWER DOOR LOCKS
Connect the diagnostic tool.
Trigger the GEM active command LOCK, UNLOCK, DD UNLOCK,
and DD LOCK ON and OFF.
Do the doors lock and unlock?
Yes
INSTALL a new
GEM. For additional
information, REFER
to Section 419-10 .
REPEAT the self-
test. CLEAR the
DTCs.
No
REPAIR the circuit in
question. REPEAT
the self-test. CLEAR
the DTCs.
Yes
INSTALL a new
GEM. For additional
information, REFER
to Section 419-10 .
REPEAT the self-
test. CLEAR the
DTCs.
No
GO to B12 .