Bluetooth 5.0 Audio Adapter for Alpine KCM-123B M-BUS Car Stereos

Introduction

This manual provides detailed instructions for the installation, operation, and maintenance of your new Bluetooth 5.0 Audio Adapter. Designed to integrate seamlessly with compatible Alpine KCM-123B M-BUS car stereos, this adapter allows for wireless audio streaming and hands-free calling, enhancing your in-car entertainment experience.

The adapter utilizes your car's existing AUX signal for high-definition audio transmission, eliminating the need for cluttered cables. It features integrated intelligent voice noise reduction technology for clear sound quality during music playback and phone calls.

Package Contents

• 1 x Bluetooth Audio Cable Adapter (JieRui-BT 5908 module with 8-pin M-BUS connector and 3.5mm female jack)
• 1 x Clip-on Microphone (if purchased with microphone option)

Note: The version without a microphone does not support call answering functionality. If hands-free calling is desired, ensure you have purchased the version that includes a microphone.

Figure 1: Complete Bluetooth Audio Adapter Kit

Specifications

Setup and Installation

Before installation, ensure your car stereo is compatible with the Alpine KCM-123B M-BUS interface and has an available AUX mode. This product is designed to utilize the car's AUX input function.

1. Power Connection:
   • Connect the red power cable of the adapter to a 12V+ power source in your vehicle.
   • Connect the black power cable of the adapter to a 12V- (ground) source in your vehicle.
2. M-BUS Connection:
   • Locate the corresponding 8-pin M-BUS socket on the back of your Alpine CD player.
   • Carefully plug the 8-pin connector of the Bluetooth adapter into this socket. Ensure a secure connection.
   

   Figure 2: 8-Pin M-BUS Connector
3. Microphone Installation (if applicable):
   • If your adapter includes a microphone, plug its 3.5mm male jack into the 3.5mm female jack on the Bluetooth module.
   • Position the clip-on microphone in a suitable location, such as on your sun visor or dashboard, ensuring it is close to your mouth for optimal voice pickup during calls.
   

   Figure 3: Clip-on Microphone

4. Cable Management:
   • Route all cables neatly and securely to prevent interference with vehicle controls or passenger movement.

Operating Instructions

1. Power On: Turn on your car stereo and vehicle ignition. The Bluetooth adapter should power on automatically.
2. Pairing Mode: The adapter will automatically enter pairing mode when powered on. Look for a blinking LED indicator on the Bluetooth module (if present) to confirm.
3. Connect Your Device:
   • On your mobile phone or other Bluetooth-enabled device, go to the Bluetooth settings.
   • Scan for available devices and select "JieRui-BT 5908" from the list.
   • Once connected, your device will confirm successful pairing.
4. Select Audio Source: On your Alpine car stereo, select the AUX audio source. This will enable audio playback through the Bluetooth adapter.
5. Play Music: You can now play music from your mobile phone or other paired device, and the audio will be transmitted wirelessly to your car's speakers.
6. Hands-Free Calling (with microphone):
   • When a call comes in, the audio will automatically switch to the car speakers.
   • Use the clip-on microphone for clear communication.
   • End the call, and audio playback will resume.

Troubleshooting

• No Sound/Adapter Not Working:
  • Check AUX Mode: Ensure your car radio is set to AUX mode. This adapter only functions when the AUX input is selected.
  • Power Connection: Verify that the red and black power cables are correctly connected to 12V+ and 12V- respectively.
  • M-BUS Connection: Confirm the 8-pin M-BUS connector is securely plugged into the correct socket on your CD player.
  • Bluetooth Pairing: Make sure your phone is successfully paired with "JieRui-BT 5908" and that the car stereo's volume is turned up.
  • Compatibility: Double-check that your Alpine car stereo model (e.g., 9501, 9503, 9823, 9825) is listed as compatible with the KCM-123B M-BUS interface.
• Poor Audio Quality:
  • Interference: Move your phone closer to the Bluetooth module to reduce potential signal interference.
  • Source Quality: Ensure the audio source (e.g., music file, streaming service) on your phone is of good quality.
  • Volume Levels: Adjust volume on both your phone and car stereo to avoid distortion.
• Microphone Not Working (for call answering):
  • Microphone Connected: Verify the 3.5mm microphone jack is fully inserted into the adapter's female port.
  • Adapter Version: Confirm you have purchased the adapter version that includes a microphone. The basic version does not support call answering.
  • Microphone Position: Ensure the microphone is positioned correctly and not obstructed.

User Tips

• Pre-Purchase Check: Always confirm your car radio has an AUX mode and is compatible with the Alpine KCM-123B M-BUS interface before purchasing to ensure functionality.
• Secure Connections: Loose power or M-BUS connections are a common cause of issues. Ensure all connections are firm.
• Microphone Placement: For the best call quality, place the clip-on microphone in a location that minimizes background noise and is directed towards the driver.
• Bluetooth Reset: If you experience persistent connection issues, try unpairing the device from your phone, restarting your phone, and then re-pairing.

Maintenance

• Cleaning: Use a soft, dry cloth to clean the adapter module and cables. Avoid using harsh chemicals or abrasive materials.
• Cable Care: Do not bend or crimp the cables excessively, as this can damage internal wiring.
• Environmental Conditions: Keep the adapter away from extreme temperatures, direct sunlight, and moisture to ensure longevity.

Warranty and Support

For any issues not covered in this manual, please contact your retailer or the manufacturer's customer support. Keep your purchase receipt as proof of purchase for warranty claims.