[PaddyH]

Hi Guys, first time poster here. I’ve found a couple of similar posts to this but thought I’d ask my own question.

Recently bought a 2007 E93 335i. The cars been great up until today. I fitted a Chinese Android head unit on the weekend as I wanted CarPlay and it’s worked fine for the past few days. However, today the dash warning lights started playing up. First it was a red ‘car on a lift’ light and a yellow circle with a triangle in the middle and an exclamation mark (DSC module failure). A reset of the head unit seemed to sort this. Then on the next start up I had a load of warning lights and all of the needles were bouncing around. Again, a reset of the head unit seemed to sort this out. Just been out to more problems and it seems the head unit has frozen!

My question is…….. Are these dash issues just a coincidence or could the head unit really be causing them? If so, how?

Thank you,

Paddy

[BRG_N54]

Your new head unit is causing a greater load on the electrical system than prior. Normally the symptoms you describe are a bad voltage regulator. The regulator could have been going bad prior, but the new component exacerbated the issue.

I would start by checking the car's voltage while running, easiest to do with the secret KOMBI menu. You also might want to check for parasitic drain, which could have also been introduced from your new electronics.

[ctuna]

If the new stuff is alway's on it will drain the battery .
Or if it prevents the car from going to sleep it will drain
the battery .

[PaddyH]

Thanks for the reply’s guys. I will investigate.

[PaddyH]

Ok so when driving the voltage guage tends to sit around 14v-14.2v. There is the occasional fluctuation though. I saw it drop as low as 12.9v momentarily. I will change the voltage regulator and see if that helps.
Thanks again

[PaddyH]

I swapped out the voltage regulator and things are definitely better but not perfect. I ordered the regulator from AUTODOC based on the pic I took of my alternator 0121 715 016. I bought a regulator that AUTODOC said would fit but the serial numbers are different to the one I removed. Is this why things are not ‘perfect’ or is there another problem? I’m thinking I need to take my car to the shop.

[PaddyH]

I still haven’t sorted this but have gathered more info….. I came home the other day to find my lights on. It was late and I’d been to the pub so I just went to bed. The battery was dead in the morning. Managed to get the car started and the lights have seemed fine since. Lately though the front drivers angel eyes are on while the car is on. Doesn’t matter where I put the switch they just stay on.
Then there’s this……….

Any ideas guys?

Thanks in advance.

[PaddyH]

Oh…. And this…….

[Obsidiane90_dustin]

I ran a shop and I have installed like more than 50 units of android screen on my customer's car. I have encountered this issue like yours and I'm sure to say that your head unit screen is causing the errors you're having on your car now. My advice is try to remove the android screen and see if the problem persists and see the "K Can Line fault" disappear from the fault list.

[PaddyH]

Thanks for the reply.
I removed the head unit a couple of days after the problem started. The ‘dancing dash’ issues are all still there. Happens when I turn on my headlights. Goes away when I turn them off. It’s bizarre.
Thanks again.