2013 Convertible... Dash and stereo have stopped working. - MINI Cooper Forum

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post #1 of 2 (permalink) Old Aug 9th, 2014, 12:00 PM Thread Starter
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2013 Convertible... Dash and stereo have stopped working.

Hey guys! Im in a bit of strife and hoping you guys can help. Currently stuck in my workshop is a 2013 Cooper S Convertible. It came in to have an active sub attached to the Harman Kardon stereo.

I've taken a high level feed directly from the amplifiers outputs to the rear speakers. I also used what appeared to be a remote wire at the HK setup. A black wire that showed 12V+ when the system powered up and 0V+ when it shut down again.

Power for the amplifier was naturally taken from the battery.

During the installation I encountered no issues. Everything relatively straight forward (I've been doing car audio and security for 15 years) biggest problem I had was that the bass level controller (mounted beside the USB/Aux-In) was a little tricky to get the cable through. Thats it. No other issues seemed to arise.

Until....

Once I finished the installation, I noticed the amp had already powered up. I thought it was strange but figured I could've inadvertently powered it up accidentally pressing the NAV button or something similar. I figured I'd test the system first and then sort out what the remote wire doing.

I pushed the power button on the stereo... nothing. Thought ok, I've had doors open this all day long and the car has probably shut down the radio.

Whacked the key in the receptacle and pushed the start button. Car bursts into life. But not stereo...worse yet.. no speedo, tacho or odometer. Infact, I got nothing. But the engine purrs along. Window wipers work, headlights and indicators work (although dash back lighting doesn't come on and indicator symbol on dash doesn't come on either.) Interior light switches work and so does the switch for the spoiler. When I open and close a door, the window will roll down and back up just like it should but if I try to use the window switch inside... no joy.

Finally, the central locking button on the dash and the key yields no response.

What I have done so far to resolve the issue before putting down tools and throwing my hands up is this...

Checked all the under hood fuses. All Ok.
Checked all fuses under dash fuses. All Ok.
Checked all connectors at fuse box (is this the BCU?) All Ok
Confirmed that all fuses have power on them also.
I have noted that there is a large black high current relay in the centre of the interior fuse box. This is constantly quite warm, indicating a massive amount of current.
The voltage measured in the car is over 14V+... All Ok

In the morning I will remove the seats again and first have a look to see if anything is amiss at the HK amplifier and then over to the underseat active sub under the drivers seat.

Before I screwed the sub amp down, I quickly peeked under the carpets to see if there was any wiring and could not see anything. Under the car itself was difficult to see because of the plastic skid pan. Does anyone know if there is any harnesses running under the carpet below the drivers seat? Other than the harness itself to the seat.

All thoughts and comments appreciated. I have not been this stumped for years! What could've possibly happened!
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post #2 of 2 (permalink) Old Aug 9th, 2014, 01:24 PM Thread Starter
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Doing my research, it looks like I've killed the K-Bus circuit somehow. Question is how, where and how bad?

Under the seat pinched by a screw?

If so, I've done one of two things... Shorted it to ground. Could be disastrous. Or shorted to 12V+ which should resolve itself once the short is removed.
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