Ford 2003 Mustang Workshop Manual page 3332

Disconnect: Passenger Door Ajar Switch C602.
Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
Monitor the GEM PID P_DR_SW.
Does GEM PID P_DR_SW read CLOSED?
D13 CHECK CIRCUIT 761 (GN/RD) FOR SHORT TO GROUND
BETWEEN GEM AND PASSENGER DOOR AJAR SWITCH
Disconnect: GEM C201c.
Measure the resistance between GEM C201c pin 5, circuit
761 (GN/RD), harness side and ground.
Is the resistance greater than 10,000 ohms?
D14 ISOLATE OPEN CIRCUIT 761 (GN/RD)
Disconnect: Passenger Door Ajar Switch C602.
Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
Connect a 10A fused jumper wire between the passenger
door ajar switch C602 pin 2, circuit 761 (GN/RD), harness
side and ground while monitoring the GEM PID P_DR_SW.
Does GEM PID P_DR_SW read AJAR with jumper wire
installed?
D15 CHECK FOR OPEN ON CIRCUIT 761 (GN/RD) BETWEEN
GEM AND PASSENGER DOOR AJAR SWITCH
Disconnect: GEM C201c.
Measure the resistance between GEM C201c pin 5, circuit
761 (GN/RD), harness side and passenger door ajar switch
C602 pin 2, circuit 761 (GN/RD), harness side.
Yes
INSTALL a new passenger
door ajar switch. REFER to
Section 501-14A . REPEAT
the self-test. CLEAR the
DTCs.
No
GO to D13 .
Yes
GO to D17 .
No
REPAIR the circuit.
REPEAT the self-test.
CLEAR the DTCs.
Yes
GO to D16 .
No
GO to D15 .
Yes
GO to D17 .
No
REPAIR the circuit.
REPEAT the self-test.
CLEAR the DTCs.