Audi: Not necessary
BMW / MINI: Not necessary
Mercedes-Benz:Not necessary, but make sure the fiber optical light is active on the back of the radio
Porsche: Not necessary, but make sure the fiber optical light is active on the back of the radio
Volvo / Land Rover / Range Rover: Not necessary. See single disc compatibility note

Yes, it supports this.

Yes, it supports with most of the head Units. There are some exceptional radios which might not be supported. See notes on concerning version interface

Check the Power Source as follows:

A: Make sure the red wire lead is connected to 12+ consistent power, not to ACC (switched power). Connecting it to cigarette lighter will cause malfunction of Mr12volt. Black wire lead is to connect to ground.

B: Many of the times, Scotch Lock wire connectors (red clips), that can be used to tap with car wiring have not been applied correctly, make sure the metal piece of the red clips are clamp down tightly. If it is done correctly, the metal piece should stay at the same level with the surface of the red clips.

A: If there is a 6Cd changer in the boot, a fiber optic loopis needed to bypass the cd changer. Makes sure this is applied on.

B: If you have a CDR23 and CDR24 Head unit, remove radio out and make sure there is a red light from the fiber optical output when Head unit is turned on.

You might have an original phone module in the MOST system, use another fiberoptic loopto bypass it.

A: For BMW, make sure there is a 6 CD changer fitted in the car.

B: If the 6Cd changer is located in the rear trunk lid (usually in E9x and E8x ), a fiber optic loop is needed to bypass the cd changer.

Your Head unit must be MP3 compatible to read ID3.

For MMI Basic make sure the 6Cd changer is disconnected and Mr12volt is installed insted.

Phone book function works only in MMI High. It does not work on MMI Basic / Low

1) Dip switch must be set correctly and 2) Check on power connection, it must be tap tightly with 12+ constant feed.

Disable navigation by using loop connector at the module usually under the passenger seat.

Insert any audio source into Mr12volt and it will show up in the display and play music right away.

When Mr12volt device is connected, it will take over the Cd function of the head unit. Simply disconnect all audio devices and it will resume to the original CDs.

Button “Next” is to answer incoming call , “Previous” is to reject it.

A:If a 6Cd changer in located in the glove box, check if Mr12volt is installed whereby original Cd changer connector is removed and connect with Mr12volt instead.

B:if there is NO 6 Cd changer, check if installation is done using the 3 way FO cable in the package, which then is installed behind the head unit.

C:For Audio 20, remove head unit out and check if there is a Red light from the Fiber Optical output when H.U. is turned on.

D:If the 6Cd changer is located at the rear trunk lid (usually in S class or SL class), aoptic looploop is needed to bypass the Cd changer.