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.
2008 Lincoln Navigator L RWDFACTORY OEM SERVICE PROCEDURE
Audio Control Module (ACM)
AUDIO CONTROL MODULE (ACM) DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description | Perform Test |
|---|---|---|
| B1136 | Audio Steering Wheel Switch #2 Circuit Failure | Go to Pinpoint Test J . |
| B1154 | Subwoofer #1 Short to Ground | Go to Pinpoint Test F . |
| B1155 | Subwoofer #1 Short to Battery | Go to Pinpoint Test F . |
| B2103 | Antenna Not Connected | Go to Pinpoint Test A . |
| B2204 | GPS Antenna Connection Open or Short | Go to Pinpoint Test O . |
| B2404 | Audio Steering Wheel Switch Circuit Fault | Go to Pinpoint Test J . |
| B2633 | Driver-Front Microphone Circuit Failure | Go to Pinpoint Test N . |
| B2913 | Audio Subwoofer Not Connected | Go to Pinpoint Test F . |
| B2965 | Audio System Speaker Circuit Fault | For vehicles with a bench seat, go to Pinpoint Test B
. For vehicles without a bench seat or THX® audio system, go to Pinpoint Test C . For vehicles with THX® audio system, go to Pinpoint Test D . |
| U0155 | Lost Communication With Instrument Panel Cluster (IC) Control Module |
NOTE:
If no related concern is currently present, disregard the DTC. If the speed sensitive volume does not operate correctly, go to Pinpoint Test R
.If the navigation is inaccurate, go to Pinpoint Test S
. |
| U0159 | Lost Communication With Parking Assist Control Module (PAM) | DISREGARD the DTC. CLEAR the DTCs. REPEAT the self-test. |
| U0193 | Lost Communication With Digital Audio Control Module (SDARS) | Go to Pinpoint Test K . |
| U0196 | Lost Communication With Entertainment Control Module - Rear (AUX) | Go to Pinpoint Test G . |
| U0197 | Lost Communication With Telephone Control Module | DISREGARD the DTC. CLEAR the DTCs. REPEAT the self-test. |
| U0238 | Lost Communication With Digital Audio Control Module "D" (DSP) | Go to Pinpoint Test E . |
| U2473 | Unexpected Vehicle Speed (VSS) | If the speed sensitive volume is inoperative, go to Pinpoint Test R
. If the navigation is inaccurate, go to Pinpoint Test S . |
Factory Service Tools
Use the Manual With the Right Hardware
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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.