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The BlueBus module physically installs in your vehicle’s trunk or cargo area, connecting to the I-Bus and CD changer connector.

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Before you begin

Ensure you have the following items:
  • BlueBus module (v1 or v2)
  • CD changer connector harness (if not already present)
  • USB cable (for firmware updates)
  • Basic tools (screwdriver, trim removal tools)
Disconnect your vehicle’s battery before beginning the installation to prevent electrical damage or short circuits.

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Installation location

The BlueBus module should be installed in the trunk or cargo area where the factory CD changer would normally be located. This location provides:
  • Access to the I-Bus connector
  • Access to the CD changer connector
  • Protection from the elements
  • Adequate ventilation for the module

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Installation steps

1

Locate the CD changer connector

Find the CD changer connector in your trunk area. This is typically a 13-pin round connector that would normally connect to a BMW CD changer. The connector location varies by model:
  • E39/E38/E53: Usually in the trunk on the right side
  • E46: Behind the trunk liner on the right side
  • E83/E85/E86: In the rear cargo area
  • MINI (R50/R52/R53): Behind rear panel in cargo area
2

Connect the I-Bus harness

Connect the BlueBus module to the CD changer connector. This connector provides:
  • Power (12V and Ground)
  • I-Bus data connection for communication with vehicle modules
  • Audio outputs (Line-level and/or amplified outputs depending on your vehicle configuration)
3

Route the microphone cable

If using the hands-free telephony features, route the microphone cable from the BlueBus module to your desired microphone location. Common locations include:
  • Overhead console (recommended)
  • A-pillar
  • Sun visor area
The BlueBus uses your vehicle’s factory microphone if one is present. The microphone input is available on the CD changer connector.
4

Secure the module

Mount the BlueBus module in a secure location using:
  • Double-sided tape
  • Velcro strips
  • Mounting brackets (if available)
Ensure the module is:
  • Away from heat sources
  • Protected from moisture
  • Accessible for firmware updates via USB
5

Verify connections

Before reassembling trim panels:
  1. Verify all connectors are fully seated
  2. Check that cables are not pinched or stressed
  3. Ensure the module has adequate clearance
  4. Verify the USB port is accessible
6

Reconnect battery and test

Reconnect your vehicle’s battery and turn the ignition to position 1 (accessories). The BlueBus module should:
  • Power on (indicated by LED)
  • Announce itself on the I-Bus
  • Appear as a CD changer on your radio display
If the module does not appear, check your wiring connections and refer to the troubleshooting guide.

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Hardware versions

BlueBus is available in two hardware versions:

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Version 1

  • Original design with BC127 Bluetooth module option
  • Separate telephone mute control (pin RB7)
  • S/PDIF reset shared with telephone mute (pin RE2)

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Version 2

  • Updated design with BM83 Bluetooth 5.0 module
  • Improved telephone control (pins RF4 and RF5)
  • Separate S/PDIF reset control
  • Enhanced power management
The hardware version is automatically detected by the firmware. You can verify your version by checking the board version status pin (PG8).

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LED indicators

The BlueBus module includes an on-board LED that indicates system status:
  • Solid green: Module powered and running
  • Blinking: Bluetooth pairing mode
  • Off: No power or system error

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Next steps

After completing the physical installation:
  1. Verify the wiring connections
  2. Configure your display unit
  3. Pair your Bluetooth devices
  4. Configure audio and telephony settings

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