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 DIAGNOSISBODY & FRAMEDOOR LOCKSKEYLESS ENTRY SYSTEM AND COMPUTER OPERATED LOCK SYSTEMDESCRIPTION AND OPERATIONKEYLESS ENTRY
2004 Ford Mustang Base, 2D Coupe, 3.9 6, Automatic
Keyless Entry
2004 Ford Mustang Base, 2D Coupe, 3.9 6, AutomaticSECTION Keyless Entry
The electronic door lock system has two main components:
- generic electronic module (GEM)
- remote transmitter
The remote transmitter initiates the following electronic system functions:
- unlocks the driver door
- unlocks all doors
- locks all doors
- activates/deactivates the panic alarm
- commands the interior lamps on (when unlocking) and off (when locking)
- sounds the horn once when LOCK is pressed twice within 3 seconds, and doors are closed
- sounds the horn twice when LOCK is pressed within 3 seconds with any door ajar
5
The remote transmitter has a minimum operating range of 10 m (33 ft).
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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.