Ford F150 Pickup. Instruction - part 42

Pinpoint Test A: No Communication With GEM/CTM 

Fig. 4: Pinpoint Test A: No Communication With GEM/CTM (A1) 
Courtesy of FORD MOTOR CO. 

Fig. 5: Pinpoint Test A: No Communication With GEM/CTM (A1 Cont. & A2) 
Courtesy of FORD MOTOR CO. 

VEHICLE SECURITY MODULE 

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Circuitry  

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GEM/CTM  

 

2003 Ford Pickup F150 

2003 ACCESSORIES AND EQUIPMENT Multifunction Electronic Module - F150 Pickup

  

Special Tool(s) 

Fig. 6: Identifying Vehicle Security Module Special Tool(s) 
Courtesy of FORD MOTOR CO. 

Principles of Operation 

The central security module controls the following systems: 

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remote keyless entry  

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computer-operated locks  

Inspection and Verification 

1. Verify the customer concern by operating the system.  

2. Visually inspect for obvious signs of electrical damage. 

 

2003 Ford Pickup F150 

2003 ACCESSORIES AND EQUIPMENT Multifunction Electronic Module - F150 Pickup

  

Fig. 7: Multifunction Electronic Modules Visual Inspection Chart 
Courtesy of FORD MOTOR CO. 

3. 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 
the diagnostic tool does not communicate with the vehicle: 

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check that the program card is correctly installed.  

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check the connections to the vehicle.  

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check the ignition switch position.  

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

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

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

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NO RESPONSE/NOT EQUIP for central security module, go to pinpoint Test B.  

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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.  

6. If the DTCs retrieved are related to the concern, go to the Diagnostic Trouble Code (DTC) Index to 

continue diagnostics.  

7. If no DTCs related to the concern are retrieved, refer to the appropriate article to continue diagnostics.  

Symptom Chart 

 

2003 Ford Pickup F150 

2003 ACCESSORIES AND EQUIPMENT Multifunction Electronic Module - F150 Pickup

  

Fig. 8: Multifunction Electronic Modules Symptom Chart 
Courtesy of FORD MOTOR CO. 

Pinpoint Tests 

Fig. 9: Pinpoint Test B: No Communication With Central Security Module (B1) 
Courtesy of FORD MOTOR CO. 

 

2003 Ford Pickup F150 

2003 ACCESSORIES AND EQUIPMENT Multifunction Electronic Module - F150 Pickup