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.
2004 Lincoln Town Car Protection SeriesFACTORY OEM SERVICE PROCEDURE
Navigation System Module Diagnostic Trouble Code (DTC) LIST
NAVIGATION SYSTEM MODULE DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description | Source | Perform Test |
|---|---|---|---|
| B2103 | Antenna Not Connected | Navigation System Module | Go To PINPOINT TEST E: POOR RECEPTION . |
| B2404 | Audio Steering Wheel Switch Circuit Fault | Navigation System Module | Go To PINPOINT TEST J: THE AUXILIARY AUDIO CONTROL IS INOPERATIVE -- STEERING WHEEL CONTROLS . |
| B2913 | Audio Subwoofer is Not Connected | Navigation System Module | Go To PINPOINT TEST M: THE SUBWOOFER IS INOPERATIVE-- NAVIGATION . |
| U2003 | Audio Compact Disk/Disk Jockey Unit is Not Responding | Navigation System Module | Not Applicable |
| U2005 | Audio Rear Integrated Control Panel Unit is Not Responding | Navigation System Module | For Ultimate vehicles, Go To PINPOINT TEST K: THE AUXILIARY AUDIO CONTROL IS INOPERATIVE/DOES NOT OPERATE CORRECTLY--REAR AUXILIARY AUDIO CONTROLS . |
| U2026 | Family Entertainment System Not Responding | Navigation System Module | Not Applicable |
Factory Service Tools
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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.