Ford F150 Pickup. Instruction - part 117

Fig. 16: Pinpoint Test C: All Door Locks Are Inoperative (C8 & C9) 
Courtesy of FORD MOTOR CO. 

LOCKS, LATCHES AND ENTRY SYSTEMS - MODULE CONTROLLED VEHICLES 

Refer to ANTI-THEFT for schematic and connector information. 

Special Tool(s) 

 

2003 Ford Pickup F150 

2003 ACCESSORIES AND EQUIPMENT Handles, Locks, Latches and Entry Systems - F150 Pickup

  

Fig. 17: Identifying Locks, Latches And Entry Systems Special Tool(s) 
Courtesy of FORD MOTOR CO. 

Principles of Operation 

Power Door Locks 

The central security module controls the power door lock and keyless entry system. The lock and unlock 
operation is carried out by supplying ground to the central security module from the door lock control switch. 
The normal path of the actuators is to ground through the central security module. The door lock control switch 
will lock and unlock all doors by grounding the appropriate circuit to the central security module. The central 
security module then supplies power to the appropriate common actuator circuit to lock or unlock all doors. 

Keyless Entry 

The keyless entry remote transmitter sends a frequency that is received by the central security module internal 
antenna. Depending on the frequency received, the central security module will lock all doors or unlock the 
driver door. If the unlock frequency is received again within five seconds of the first unlock, the central security 
module will unlock all doors. 

 

2003 Ford Pickup F150 

2003 ACCESSORIES AND EQUIPMENT Handles, Locks, Latches and Entry Systems - F150 Pickup

  

If the frequency received is for the panic button, the central security module will cycle ground to the park lamp 
and horn. The park lamps and horn will continue to cycle until the panic button is pressed again or the ignition 
switch is turned to the RUN position. 

Inspection and Verification 

1. Verify the customer concern by operating the system.  

2. Visually inspect for obvious signs of mechanical and electrical damage. Refer to Fig. 18 : 

Fig. 18: Visual Inspection Chart 
Courtesy of FORD MOTOR CO. 

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before 

proceeding to the next step.  

 

2003 Ford Pickup F150 

2003 ACCESSORIES AND EQUIPMENT Handles, Locks, Latches and Entry Systems - F150 Pickup

  

4. If the concern remains after the inspection, connect the diagnostic tool to the data link connector (DLC) 

located beneath the instrument panel and select the vehicle to be tested from the diagnostic tool menu. If 
diagnostic tool does not communicate with the vehicle: 

z

check that the program card is correctly installed.  

z

check the connections to the vehicle.  

z

check the ignition switch position.  

5. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool instruction.  

6. Carry out the DATA LINK DIAGNOSTICS test. If the diagnostic tool responds with: 

z

CKT914, CKT915 or CKT70=ALL ECUS NO RESP/NOT EQUIP, refer to MODULE 
COMMUNICATIONS NETWORK - F150 .  

z

NO RESP/NOT EQUIP for Central security module, refer to MULTIFUNCTION 
ELECTRONIC MODULE - F150 .  

z

SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the 
continuous DTCs, and carry out self-test diagnostics for the central security module.  

7. If the DTCs retrieved are related to the concern, go to the central security module Diagnostic Trouble 

Code (DTC) Index to continue diagnostics.  

8. If DTCs are retrieved that are not found in the following central security module Diagnostic Trouble 

Code (DTC) Index, refer to the master central security module Diagnostic Trouble Code (DTC) Index in 
MULTIFUNCTION ELECTRONIC MODULE - F150 .  

9. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics.  

Central Security Module Diagnostic Trouble Code (DTC) Index 

 

2003 Ford Pickup F150 

2003 ACCESSORIES AND EQUIPMENT Handles, Locks, Latches and Entry Systems - F150 Pickup