Ford 2003 Mustang Workshop Manual page 3499

Is the resistance less than 5 ohms?
A3 CHECK CIRCUIT 397 (BK/WH) FOR SHORT TO POWER
Measure the voltage between GEM C201b pin 2, circuit 397
(BK/WH), harness side and ground.
Is any voltage present?
PINPOINT TEST B: THE COURTESY LAMPS ARE INOPERATIVE
B1 CHECK IGNITION STATES
Monitor the GEM PIDS IGN_KEY, IGN_A, IGN_S, and IGN_R
while cycling the ignition switch through the OFF, ACC, RUN,
START and key out positions.
Do the PID values agree with the ignition switch
positions?
B2 CHECK THE DOOR AJAR INPUT TO THE GEM
Monitor the GEM PID D_DOOR, and P_DOOR, while
opening and closing the driver and passenger doors.
Do the GEM PIDS D_DOOR and P_DOOR agree with the
driver and passenger door positions?
B3 CHECK THE DOME LAMP SWITCH STATUS INPUT TO THE
GEM — MONITOR THE GEM PID DOMESW
Monitor the GEM PID DOMESW, while activating, and
deactivating the dome lamp switch.
Does the GEM PID DOMESW agree with the dome lamp
switch position?
B4 CHECK THE LUGGAGE COMPARTMENT LID AJAR INPUT
TO THE GEM — MONITOR THE GEM PID DECKLID
Test Step
Yes
REPAIR the circuit. TEST
the system for normal
operation.
No
REFER to Section 418-00
Result / Action to Take
Yes
GO to B2 .
No
For key-in-ignition
concerns, REFER to
Section 413-09 .
Yes
GO to B3 .
No
REFER to Section 413-
09 .
Yes
GO to B4 .
No
GO to B13 .
.