New stereo draining battery

[Dallas]

I finally replaced the oem stereo in my MK5 Jetta with a full featured double din Chinese stereo, it works and sounds great! But now the battery seems to be slowing draining when it's not driven for a couple days. It's a simple plug and play system.
I remember reading somewhere a while back about this issue, but I don't recall what the fix was. Searching here didn't really tell me much. Anyone know much about this symptom?

 

[relumalutan]

You need to upgrade to a newer version of the CanBus module, located under the dashboard.

 

[nokivasara]

My Chinese stereo had an option to leave a wire unplugged to work with the can bus system.

 

[Dallas]

My Chinese stereo had an option to leave a wire unplugged to work with the can bus system.

I'll check on that, thanks.

 

[Dallas]

I looked at the wiring diagram and found 2 wires that are for the can bus. I will pull the radio back out today and see if these are connected or not.
I also did more searching here and found this link on diy upgrading MK5 can bus. I have a vcds on the way so I think I can get it from here. One of these 2 things should fix it.
http://www.myturbodiesel.com/wiki/rn...n-in-a-mk5-vw/

 

[jokila]

I finally replaced the oem stereo in my MK5 Jetta with a full featured double din Chinese stereo, it works and sounds great! But now the battery seems to be slowing draining when it's not driven for a couple days. It's a simple plug and play system.
I remember reading somewhere a while back about this issue, but I don't recall what the fix was. Searching here didn't really tell me much. Anyone know much about this symptom?

This reminds me of the issue where the Monsoon amp still stays on and drains the battery when coupled with an aftermarket radio.

 

[Dallas]

This reminds me of the issue where the Monsoon amp still stays on and drains the battery when coupled with an aftermarket radio.

This one doesn't have a Monsoon amp. My MK4 has one and the stereo won't shut off until I lock the doors. I'm ok with that issue.

 

[hodizz]

mine did the same thing - Had to do this -- haven't had an issue since
you have to cut yellow wire to can bus box on radio and wire it to a switched on power
canbus box on radio is wired with constant on power so it drains the battery slowly

https://www.autopumpkin.com/forum/viewtopic.php?t=161

 

[Dallas]

mine did the same thing - Had to do this -- haven't had an issue since
you have to cut yellow wire to can bus box on radio and wire it to a switched on power
canbus box on radio is wired with constant on power so it drains the battery slowly

https://www.autopumpkin.com/forum/viewtopic.php?t=161

Perfect! Thanks! That's exactly what I was looking for.

Say, how do you like your turbo upgrade? I have the same one and it's going in this weekend, along with the injectors.

 

[hodizz]

I enjoy the turbo a lot. Spool up very quick. 26psi really woke the car up. Have had on my car for about 3 years and not had any issues with it. Should be very nice with injector upgrade. Plan to do the same here. one day...

 

[Dallas]

mine did the same thing - Had to do this -- haven't had an issue since
you have to cut yellow wire to can bus box on radio and wire it to a switched on power
canbus box on radio is wired with constant on power so it drains the battery slowly

https://www.autopumpkin.com/forum/viewtopic.php?t=161

This yellow wire mod did the trick for my battery drain, thanks!

 

[rocketeer928]

I'm having the battery drain issue too with a new stereo on my MKIV Jetta. What did you connect the yellow wire to for power when the car is turned on?

 

[rocketeer928]

Nobody knows?

 

[DieterLange]

A bit of a dodgy solution but could work temporarily well you find a new CANBUS gateway or an adapter. I haven't had any problems so far.

A tested and proven quick fix for rcd510/rns510 power drain

A tested and proven quick fix for rcd510/rns510 power drain

www.mk5golfgti.co.uk

 

[rocketeer928]

I've seen that before in a YouTube video. Might work for the MKV. However, for my MKIV the radio fuse is not under the hood, but the left of the dash inside the car. When I tried a similar approach using the empty automatic transmission slot, which is also inside on the MKIV, it wouldn't work, and rather some weird electric thing happened instead.

So, this is why I'm asking for an appropriate power connection for the yellow wire. My initial thought is the interior fan switch just below the radio.

 

[rocketeer928]

I found this, which might be an option: https://www.vwvortex.com/threads/solution-to-monsoon-amp-draining-battery.6086643/?id=6086643

Or perhaps this:

 

[rocketeer928]

Today I finally had time to tackle the new stereo parasitic battery drain issue. I had pulled the fuse and haven't been using the stereo from winter through spring. Turns out that I don't have a Monsoon amp in my Jetta, so even though I had the parts, that fix wasn't an option.

So, I tried this option instead from autopumpkin.com:

Underneath the dash, I used the switch 75X terminal. The blue wire toward the back is the one I installed to the stereo compartment.

That blue wire is now connected to the yellow wire leading from the stereo connector.

Put the fuse back in and the stereo works again. Now I'll let the car just sit in the garage for a couple of weeks to see if the battery drains again. I hope not!!

 

[rocketeer928]

The good news: My TDI sat for two weeks and the battery didn't die, so the parasitic drain caused by the Pioneer stereo has been fixed.

The bad news: Now every time I get into the car, I need to press a few "buttons" up front to get the radio to work with my mobile phone. So, it's not an automatic process anymore. Oh well, I'll take the inconvenience over a dead battery.