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Harness extension Amp bypass BMW / Land Rover

Extension cable for converting a BMW Professional OEM Sat Nav or a Land Rover High Line and Basic OEM HU, each with a DSP OEM amplified system, to a universal retrofit HU.

The extension cable makes it possible to move the device connection from the BMW OEM tuner silver box in the boot to the front in the radio slot.

The active system Amp bypass adapter is used to connect the OEM speakers of the OEM amplified systems directly to the retrofit HU by bypassing the OEM amplifier.

The front and rear speaker outputs of the retrofit HU are used.

Depending on the vehicle and the installed OEM amplified system various speakers such as a centre or subwoofer may be omitted and must be operated via an additionally installed power amplifier.

Check the impedance and phase of the OEM speakers before installation.
Check the function before final assembly

Please contact our support team for help


connector: 40 Pin(m/f) BMW Quadlock harness extension 500cm
connector: 40 Pin(m/f) BMW Quadlock
connector: 15 Pin OEM amplifier speaker bypass
connector: MQS plug (look into the manual)

connection to OEM Sat Nav connector:
yellow/blue: +12V reverse gear
yellow/red: speed pulse

antenna connection required:
Antenna cable extension Fakra(m)>Fakra(f) 500cm ROKA bulk > item: 1524-500-1-0

vehicles with DSP OEM amplified system I Bus controlled
vehicles with Harman Kardon OEM amplified system amplifier SA677A

vehicles without OEM Hifi System amplifier SA676A

vehicles BMW:
OEM amplifier > boot behind left side panel driver's side
OEM tuner silverbox > trunk floor next to the battery

vehicles Land Rover:
OEM amplifier > boot behind left side panel driver's side

Vehicle applictation:

BMW X5 (E53) 03/2000 - 10/2003
BMW X5 (E53) 10/2003 - 11/2006

Land Rover
Land Rover Range Rover (LM) 01/2002 - 05/2005*

vehicles without High Line DSP OEM amplified system with 11 / 14 speaker