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.
2003 Lincoln Navigator RWDFACTORY OEM SERVICE PROCEDURE
Entertainment System DTCS
ENTERTAINMENT SYSTEM (AUDIO UNIT) DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description | Source | Perform Test |
|---|---|---|---|
| B1342 | ECU is Defective | Audio Unit | CLEAR and DOCUMENT the DTCs. CARRY OUT the self-test. REMOVE the audio unit and SEND it to an authorized Ford audio system repair facility if DTC B1342 is retrieved again. TEST the system for normal operation. |
| B2401 | Audio Tape Deck Mechanism Fault | Audio Unit | VERIFY that no cassette is inserted in the audio unit. CLEAR and DOCUMENT the DTCs. CARRY OUT the self-test. If DTC B2401 is retrieved again, REMOVE the audio unit and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation. |
| B2402 | Audio CD/DJ Thermal Shutdown Fault | Audio Unit | GO to PINPOINT TEST B: THE CD CHANGER IS INOPERATIVE/DOES NOT OPERATE CORRECTLY--VNR ONLY . |
| B2403 | Audio CD/DJ Internal Fault | Audio Unit | GO to PINPOINT TEST B: THE CD CHANGER IS INOPERATIVE/DOES NOT OPERATE CORRECTLY--VNR ONLY . |
| B2404 | Audio Steering Wheel Switch Circuit Fault | Audio Unit | GO to PINPOINT TEST K: THE AUXILIARY AUDIO CONTROL IS INOPERATIVE - STEERING WHEEL CONTROL . |
| B2405 | Audio Single-Disc CD Player Thermal Shutdown Fault | Audio Unit | CLEAR and DOCUMENT the DTCs. CARRY OUT the self-test. If DTC B2405 is retrieved again, REMOVE the audio unit and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation after the repair. |
| B2406 | Audio Single-Disc CD Player Internal Fault | Audio Unit | CLEAR and DOCUMENT the DTCs. CARRY OUT the self-test. If DTC B2406 is retrieved again, REMOVE the audio unit and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation after the repair. |
| U2003 | Audio Compact Disc/Disc Jockey is Not Responding | Audio Unit | If equipped with CD/DJ, GO to PINPOINT TEST B: THE CD CHANGER IS INOPERATIVE/DOES NOT OPERATE CORRECTLY--VNR ONLY . |
| U2005 | Audio Rear Seat Controller (RSC) Unit is Not Responding | Audio Unit |
NOTE:
U2005 is retrieved if RSC Unit is not present, disconnected or inoperative. If equipped with RSC, GO to PINPOINT TEST I: THE AUXILIARY AUDIO CONTROLS ARE INOPERATIVE - REAR SEAT CONTROLLER (RSC) UNIT
.
|
| U2014 | Audio Subwoofer Unit is Not Responding | Audio Unit | GO to PINPOINT TEST H: THE SUBWOOFER IS INOPERATIVE . |
| A477 | Audio Unit Configuration | Audio Unit | CLEAR and DOCUMENT the DTCs. CARRY OUT the self-test. If DTC A477 is retrieved again, REMOVE the audio unit and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation after the repair. |
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.
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