Retrofitting aux input to BMW E46 325i (M54B25) business CD radio

[spinecki]

Retrofitting aux input to BMW E46 325i (M54B25) business CD radio

Options for aux input:

• BMW OEM aux input adapter
• Aftermarket aux input adapter
• Direct wiring to radio PCB (advanced)

Installation steps (using OEM adapter):

• Remove radio from dashboard
• Locate 3-pin port on back of radio
• Connect OEM aux adapter (part number: 82110149389)
• Route aux cable to desired location (e.g., center console)
• Reinstall radio
• Activate aux input using diagnostic tool or coding

Additional considerations:

• Some radios may require software update for aux functionality
• Consider bluetooth adapter for wireless connectivity
• Ensure proper grounding to avoid noise issues

Note: The OEM solution is often the most reliable, but aftermarket options can provide additional features like bluetooth.