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  #1  
Old 10-22-2023, 03:30 PM
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Battery drain / Nav unit always on

Hi,

Iíve done quite a lot of searching on here and the web generally and thereís a few related posts and many more that mention this is known problemÖ but not sure Iíve really found a solution yet.

So I have a 4.8is with widescreen nav, CD changer swapped out for a GROM Bluetooth unit instead and also an additional amp and sub added (wired to come on with remote power connection on the E53 alpine amp).

This setup has been in place for several months, and Iíve had no problems. Earlier this week though I noticed the GROM Bluetooth unit was staying on after I had parked up (even hours/days later). I only noticed as my phone would keep connecting to it which was quite annoying.

Earlier today, battery was of course completely dead. Couldnít even unlock the car Ö so Iíll probably end up having to buy another new battery (replaced only a few months ago also).

Iíve put the car on a CTEK to charge/recover the battery but also has a quick poke around and noticed that the red light on the mk4 nav unit never seems to go out which seems abnormal to me.

I think the car is going into sleep mode (no light on the gear shift) but I canít be 100% sure.

Any ideas what could be causing the nav unit to stay on? Any ideas on a fix for this?

Bit odd that this should happen now, car had been sat for weeks unused without a problem before I used it for a trip earlier this week.
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  #2  
Old 11-05-2023, 12:40 PM
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Finally had some time to try and dig into this a little further.

The car definitely goes to sleep (orange light on gear shift next to P goes out) and the nav unit is definitely staying on permanently.

I measured drain, once the car sleeps it dropped to about 0.65A (with the nav unit red light still on / blinking).

I disconnected the mk4 DVD nav and then it drops to 0.2A and stays there. I tried pulling other fuses (72,73,74,75) for the audio/ telephone/nav modules but the current didn’t drop any further.

Is 0.2A about right or does this seem high still?

I guess I can try and replace the nav module but I’m guessing its possible something else is keeping the nav awake and the nav is actually fine?
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Old 11-05-2023, 02:42 PM
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The current draw shouldn't be more than 40 mA when the vehicle is in sleep mode.

Nav module is woken up by I-bus.
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  #4  
Old 11-05-2023, 02:43 PM
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40mA. Bah, way over that right now then at 200mA.

Guess I need to figure out what the heck else is staying on then. Could be anything else on the iBus I guess?
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Old 11-05-2023, 03:09 PM
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So is the GROM BT module also powered by separate activated supply? Or have you tested the obvious and disconnected that BT module?
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  #6  
Old 11-05-2023, 04:33 PM
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Quote:
Originally Posted by hamza View Post
40mA. Bah, way over that right now then at 200mA.

Guess I need to figure out what the heck else is staying on then. Could be anything else on the iBus I guess?
Just did this test myself. It takes 16 min (advertised) to go fully to sleep. I secured my meter between ground wire and post by the fuseable link box under the trunk floor on the left side (didnít want to pull my air compressor again). Then I propped it up so I could read it with the trunk lid closed and closed and locked the car. Hack your watch and wait. It goes down in a couple small increments, as I assume boxes go to sleep, but at right about 16 min the current dropped significantly to between 40 and 50 milliamps.

If it doesnít go to sleep fully, then pull a fuse to a likely suspect and repeat the above process. I read that the phone and nav tend to cause these problems.
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  #7  
Old 11-05-2023, 05:09 PM
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Quote:
Originally Posted by Clavurion View Post
So is the GROM BT module also powered by separate activated supply? Or have you tested the obvious and disconnected that BT module?
The Grom is powered by the connections for the original CD multi changer.

I did disconnect the Grom, but I didnít wait the 16mins to see if removing it allowed other things to go to sleep, so I guess I need to try and do that now.
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  #8  
Old 11-05-2023, 05:11 PM
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Quote:
Originally Posted by Henn28 View Post
Just did this test myself. It takes 16 min (advertised) to go fully to sleep. I secured my meter between ground wire and post by the fuseable link box under the trunk floor on the left side (didnít want to pull my air compressor again). Then I propped it up so I could read it with the trunk lid closed and closed and locked the car. Hack your watch and wait. It goes down in a couple small increments, as I assume boxes go to sleep, but at right about 16 min the current dropped significantly to between 40 and 50 milliamps.

If it doesnít go to sleep fully, then pull a fuse to a likely suspect and repeat the above process. I read that the phone and nav tend to cause these problems.
Thanks, this is exactly what I did too (though I removed the air compressor anyway but then realised I didnít need to).

I did pull several fuses, BUT, I didnít wait the 16mins, so it could be that something on those fuses was sending iBus messages and keeping something awakeÖ so I guess I need to go back and do this again and wait 16mins after pulling each fuse too.
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  #9  
Old 11-09-2023, 04:40 AM
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More weirdness.

I left the car on the weekend with the nav unit removed. Car went to sleep, bluetooth on the GROM disconnected from my phone. Seemed ok(ish) with a somewhat high draw but at least the GROM was turning off correctly.

Last night, so several days later, the GROM woke up. I noticed because it seems pretty aggressive in connecting to my phone and even when I’m in the house it will connect to the GROM and I lose my audio which is quite annoying but right now I guess useful too as it alerts me to some weirdness.

So what the heck is causing the GROM, which I guess to the car is just a CD player, to wake up several days later and stay on (its still on right now).

I don’t have the ammeter connected anymore so can’t see the current draw unfortunately but I’ve ordered a Bluetooth connected ammeter with data logger so I can leave it connected with the car again for a few days.

I guess maybe the GROM has become faulty?
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  #10  
Old 11-10-2023, 06:05 AM
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Aaand a day later the GROM Bluetooth is off again without being touched.
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