After installing an aftermarket touch screen radio in a vehicle, diagnostic trouble codes (DTCs) often appear in the CAN bus and radio modules. Specifically, VCDS users may encounter the 01304 fault code, indicating a communication error with the radio. This article explores this common issue and potential solutions.
Understanding VCDS 01304 and Aftermarket Radio Installations
When replacing a factory radio with an aftermarket unit, the CAN bus system may not recognize the new device. This is because the factory radio communicates with other modules on the network, such as the navigation system, steering wheel controls, and the instrument cluster. An aftermarket radio typically lacks the necessary communication protocols to integrate seamlessly. This communication breakdown triggers DTCs, including the 01304 error code in module 19 (CAN Gateway). The VCDS scan will likely also show a “Radio – Status: Cannot be reached” message in module 56. Additionally, related errors, such as “01305 – Databus for Infotainment – No Signal/Communication,” might also appear.
Common Solutions for VCDS 01304
The primary goal is to restore proper communication within the CAN bus system. While completely coding out the radio might seem like a solution, it’s often not recommended or even possible. Here are some approaches:
- CAN Bus Adapters: Installing a CAN bus adapter specifically designed for your vehicle’s make and model can bridge the communication gap between the aftermarket radio and the vehicle’s CAN bus system. These adapters translate the signals, allowing for proper data exchange.
- Wiring Harness Adapters: Ensure you’re using the correct wiring harness adapter for your vehicle and aftermarket radio. A compatible harness will ensure proper power and signal connections, minimizing the risk of communication errors.
- Coding Adjustments: In some cases, minor coding adjustments within the CAN Gateway (module 19) might be necessary. Consult your radio’s installation manual or online forums dedicated to your vehicle for specific coding instructions. However, proceed with caution when modifying coding, as incorrect changes can lead to further issues. Always back up your original coding before making any changes.
- Diagnosis with VCDS: Using VCDS, thoroughly scan all related modules, including the CAN Gateway (19), Radio (56), and any other modules reporting errors. Analyzing the freeze frame data associated with each DTC can provide valuable clues for troubleshooting.
Conclusion: Addressing VCDS 01304 After Installing an Aftermarket Radio
Resolving the VCDS 01304 error after installing an aftermarket radio requires a systematic approach, focusing on establishing proper communication between the new radio and the vehicle’s CAN bus system. Utilizing a compatible CAN bus adapter and wiring harness, along with potential coding adjustments, are common solutions. Thorough diagnostics with VCDS is crucial for identifying the root cause and guiding the troubleshooting process. Remember to consult vehicle-specific resources and proceed cautiously with any coding modifications.
