Ford 2003 Mustang Workshop Manual page 3287

Measure the voltage between the GEM C201e pin 26,
circuit 450 (DG/LG), harness side and ground.
Is any voltage present?
K8 CHECK THE GEM MODULE FOR AN INTERNAL OPEN
Connect: Instrument Cluster C220a.
Install a fused (10A) jumper wire between the GEM C201e
pin 26, circuit 450 (DG/LG), harness side and ground.
Key in ON position.
Did the safety belt indicator illuminate?
K9 CHECK CIRCUIT 450 (DG/LG) FOR AN OPEN
Key in OFF position.
Disconnect: Instrument Cluster C220a.
Measure the resistance between the GEM C201e pin 26,
circuit 450 (DG/LG), harness side and instrument cluster
C220a pin 4, circuit 450 (DG/LG), harness side.
Is the resistance less than 5 ohms?
K10 CHECK FOR CORRECT GEM OPERATION
Disconnect all GEM connectors.
Check for:
corrosion
pushed-out pins
Connect all GEM connectors and make sure they seat
correctly.
Operate the system and verify the concern is still present.
Is the concern still present?
operation.
No
GO to K8 .
Yes
GO to K10 .
No
GO to K9 .
Yes
GO to K11 .
No
REPAIR the circuit. TEST
the system for normal
operation.
Yes
INSTALL a new GEM.
REFER to Section 419-10
TEST the system for normal
operation.
No
The system is operating
correctly at this time.
.