Ford 2003 Mustang Workshop Manual page 3330

Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
Monitor the GEM PID P_DR_SW while opening and closing
the passenger door.
Do the GEM PID P_DR_SW values indicate CLOSED and
AJAR correctly?
D5 CHECK CIRCUIT 765 (YE/BK) AND DRIVER DOOR AJAR
SWITCH FOR OPEN OR SHORT TO GROUND
Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
Monitor the GEM PID D_DR_SW while opening and closing
the driver door.
Does the GEM PID D_DR_SW value indicate AJAR with
driver door closed?
D6 ISOLATE SHORT TO GROUND ON CIRCUIT 765 (YE/BK)
Disconnect: Driver Door Ajar Switch C526.
Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
Monitor the GEM PID D_DR_SW.
Does GEM PID D_DR_SW read CLOSED?
D7 CHECK CIRCUIT 765 (YE/BK) FOR SHORT TO GROUND
BETWEEN GEM AND DRIVER DOOR AJAR SWITCH
Disconnect: GEM C201c.
Measure the resistance between GEM C201c pin 13, circuit
765 (YE/BK), harness side and ground.
Is the resistance greater than 10,000 ohms?
D8 CHECK CIRCUIT 765 (YE/BK) FOR OPEN
Disconnect: Driver Door Ajar Switch C526.
Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
Connect a 10A fused jumper wire between driver door ajar
switch C526 pin 2, circuit 765 (YE/BK), harness side and
ground while monitoring GEM PID D_DOOR.
Yes
GO to D17 .
No
GO to D11 .
Yes
GO to D6 .
No
GO to D8 .
Yes
INSTALL a new driver door
ajar switch. REFER to
Section 501-14A . REPEAT
the self-test. CLEAR the
DTCs.
No
GO to D7 .
Yes
GO to D17 .
No
REPAIR the circuit.
REPEAT the self-test.
CLEAR the DTCs.
Yes
GO to D10 .
No
GO to D9 .