Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2004MUSTANG BASE, 2D COUPE, 3.9 6, AUTOMATICREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSKEYLESS ENTRY SYSTEM AND COMPUTER OPERATED LOCK SYSTEM
2004 Ford Mustang Base, 2D Coupe, 3.9 6, Automatic
Keyless Entry System And Computer Operated Lock System
2004 Ford Mustang Base, 2D Coupe, 3.9 6, AutomaticSECTION Keyless Entry System And Computer Operated Lock System
- Description And Operation
- Diagnosis And Testing
- Keyless Entry
- Notes
- Principles of Operation
- Inspection and Verification
- Generic Electronic Module (GEM) Diagnostic Trouble Code (DTC) Index
- Symptom Chart
- Pinpoint Tests
- Pinpoint Test A: No Communication With The Generic Electronic Module
- Pinpoint Test B: All Door Locks Are Inoperative
- Pinpoint Test C: The Doors Do Not Lock/Unlock Using The Remote Transmitter
- Pinpoint Test D: The Luggage Compartment Door Is Inoperative Using The Remote Transmitter
- Pinpoint Test E: Panic Feature Is Inoperative/Does Not Operate Correctly
- Pinpoint Test F: The Remote Keyless Entry Transmitter Is Out Of Synchronization
- Pinpoint Test G: The Remote Transmitter Has Poor Range Performance
- Keyless Entry
- General Procedures
- Removal And Installation
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.