A car radio ceasing to function can be frustrating. This article explores troubleshooting steps and potential solutions for a “Radio 01304 – No Signal/Communication” error code in VCDS (VAG-COM Diagnostic System). The error was encountered after recent dealer work, including a DPF regeneration software update and fuse replacement. Initial attempts to resolve the issue, such as holding the power button and checking fuses, were unsuccessful.
Understanding VCDS Radio Error 01304
The “01304 – Radio 004 – No Signal/Communication” error in VCDS typically indicates a loss of communication between the radio unit and the vehicle’s diagnostic system. This can stem from various causes, ranging from simple wiring issues to a complete radio failure. The accompanying freeze frame data in VCDS might offer additional clues for pinpointing the problem’s root cause. In this particular case, the fault priority is 6, and the fault frequency is 1, meaning it’s a relatively significant error that occurred once.
Troubleshooting Steps for 01304 Error
Before replacing the radio, several troubleshooting steps can be taken:
Check Power and Ground Connections
Ensure the radio is receiving proper power and ground. While the initial check indicated 12 volts on the power wires, it’s crucial to verify these readings directly at the radio’s connector. A multimeter can confirm voltage and ground integrity.
Inspect Wiring Harness
Carefully examine the radio’s wiring harness for any signs of damage, such as loose connections, broken wires, or corrosion. Disconnect and reconnect the harness to ensure a secure connection.
Battery Disconnect/Reconnect
Disconnecting the battery for a few minutes can sometimes reset the radio and clear temporary glitches. This allows the system to reboot and potentially resolve communication errors.
Review Recall Information
Research the specific DPF regeneration software update performed by the dealer. Determine if any known issues or technical service bulletins (TSBs) exist related to radio malfunctions after this update.
Consult VCDS Forums and Resources
Online forums dedicated to VCDS often contain valuable insights from experienced users who have encountered similar issues. Searching for “01304 VCDS” or “Radio No Signal VCDS” can yield potential solutions.
Addressing the 03138 AUX Input Error
The existing “03138 – Input AUX IN 009 – Open or Short to Ground” error, while potentially unrelated to the radio failure, should also be addressed. This code suggests a problem with the auxiliary input wiring. Inspecting the AUX input cable and its connection to the radio can help resolve this issue.
Conclusion
The VCDS radio error 01304 signifies a communication breakdown. While replacing the radio might be necessary, exploring troubleshooting steps like verifying power and ground, inspecting the wiring harness, disconnecting the battery, researching recall information, and consulting online resources can potentially identify a less costly solution. Addressing the auxiliary input error is also recommended. If the problem persists after these steps, seeking professional automotive diagnostic assistance is advisable.
