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 Volvo XC70FACTORY OEM SERVICE PROCEDURE
Audio Module (AUM) DTCS
AUDIO MODULE (AUM) - DTC INDEX
| DTC | Description |
|---|---|
| AUM-4001 | Antenna amplifier 1. Signal too low. Intermittent fault |
| AUM-4001 | Antenna amplifier 1. Signal too low. Permanent fault |
| AUM-4002 | Amplifier, main antenna. Signal too high. Intermittent fault |
| AUM-4002 | Amplifier, main antenna. Signal too high. Permanent fault |
| AUM-40FF | Amplifier, main antenna. Signal missing. Intermittent fault |
| AUM-40FF | Amplifier, main antenna. Signal missing. Permanent fault |
| AUM-41FF | Amplifier, sub-antenna. Signal missing. Intermittent fault |
| AUM-41FF | Amplifier, sub-antenna. Signal missing. Permanent fault |
| AUM-42FF | Single CD player. Not connected or communication problems. Intermittent fault |
| AUM-42FF | Single CD player. Not connected or communication problems. Permanent fault |
| AUM-43FF | MiniDisc player. Not connected or communication problems. Intermittent fault |
| AUM-43FF | MiniDisc player. Not connected or communication problems. Permanent fault |
| AUM-44FF | 4 disc CD changer. Not connected or communication problems. Intermittent fault |
| AUM-44FF | 4 disc CD changer. Not connected or communication problems. Permanent fault |
| AUM-45FF | Cassette deck. Not connected or communication problems. Intermittent fault |
| AUM-45FF | Cassette deck. Not connected or communication problems. Permanent fault |
| AUM-46FE | 10 disc CD changer. Faulty installation. Intermittent fault |
| AUM-46FE | 10 disc CD changer. Faulty installation. Permanent fault |
| AUM-46FF | 10 disc CD changer. Not connected or communication problems. Intermittent fault |
| AUM-46FF | 10 disc CD changer. Not connected or communication problems. Permanent fault |
| AUM-47FE | Amplifier. Faulty installation. Intermittent fault |
| AUM-47FE | Amplifier. Faulty installation. Permanent fault |
| AUM-47FF | Amplifier. Not connected or communication problems. Intermittent fault |
| AUM-47FF | Amplifier. Not connected or communication problems. Permanent fault |
| AUM-48FD | Control module. Faulty frequency setting. Intermittent fault |
| AUM-48FD | Control module. Faulty frequency setting. Permanent fault |
| AUM-49FD | Control module. Faulty installation. Intermittent fault |
| AUM-49FD | Control module. Faulty installation. Permanent fault |
| AUM-4BFF | Control module. Internal program fault. Intermittent fault |
| AUM-4BFF | Control module. Internal program fault. Permanent fault |
| AUM-E001 | Control module communication. Faulty communication |
| AUM-E003 | Configuration fault. Faulty configuration |
| AUM-XXXX | Unknown diagnostic trouble code (DTC) for the current control module version |
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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