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Discussion Starter #1
Hey guys just need some input on this problem.
I took my 03 HSE in for a battery drain issue (which has been thoroughly documented in these forums)
The dealership is telling me to solve the issue I need a new Navigation Unit priced at 2400 installed.
I'm surprised the entire unit needs to be replaced to solve the problem, any thoughts?
 

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RoverHomie said:
Hey guys just need some input on this problem.
I took my 03 HSE in for a battery drain issue (which has been thoroughly documented in these forums)
The dealership is telling me to solve the issue I need a new Navigation Unit priced at 2400 installed.
I'm surprised the entire unit needs to be replaced to solve the problem, any thoughts?
Pull the fuse on the navi unit and see if you still have a batt drain
 

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I don't think they are trying to rip you off as much as they are trying to solve your problem with as little effort as possible on their part. Agree with above suggestion, and I would do additional troubleshooting both on the net and get a second opinion from another dealer.
 

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When the fuse is pulled (I forget the specific number) the battery drain stops. Besides paying full price for a new unit I have 2 options, Buy one off ebay or wire a kill switch to the fuse and hit it once the vehicle is off.
 

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RoverHomie said:
When the fuse is pulled (I forget the specific number) the battery drain stops. Besides paying full price for a new unit I have 2 options, Buy one off ebay or wire a kill switch to the fuse and hit it once the vehicle is off.
Well now you know where it's draining from, you can either go into rave and start testing all the probable locations or pay someone to do it. It could be as simple as a wire, could be some internal damage inside the nav/audio... I'd start by checking all the connections.
 

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some people find following wire schematics confusing, others dont, it definetly doesnt need to be a dealer to do it if you dont want to do it yourself.
 

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gw2doc said:
some people find following wire schematics confusing, others dont, it definetly doesnt need to be a dealer to do it if you dont want to do it yourself.
Thats certainly something way beyond my skill set with electronics.
 

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Do a search on the BMW forums to see if this is a known problem. I find it hard to believe that it's the head unit, but who knows.

One way of going about a search like this is to unplug one unit at a time with an ammeter attached at the battery till you find the unit drawing power - similar to what you did with the fuse. The next step would be to identify all items being fed + current through the fuse you pulled and then checking these one at a time. If your dealer did this, he may have ended up at the head unit - although this is the one item in the nav system that he def won't have unplugged. Whatever you have done, keep all old parts till you're sure they were the source of the prob.
 

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What are they telling you has failed? The head unit screen etc, or the sat nav computer (in the boot)?

You could buy the BMW mk4 computer, a highly recommended upgrade and it is complete plug and play for your model (search for bmw mk4 sat nav). Then that kills two birds with one stone. Secondly I personally wouldn't believe the dealer that your problem lies with the Nav at all. These do have a draw but it continues the whole time the door is open and then for a set time after you've closed the door. But to be frank the dealers seem to be so incompetent they may not know this. Buy one of these and test the fuse yourself. Plug it in, lock the car up and come back 15 mins later, check it through the window for draw.

It is important that you DO NOT DISCONNECT the sat nav computer whilst the red light is on (the nav computer is in the boot, left hand side) if you remove the power whilst the light is on you will destroy it and then have to buy one whether you like it or not.

I would think more likely it is the very common Blower Resistor, you can change this part relatively easily yourself to rule it out, it's about £30.

Please post back with more info if some of the above does not apply or doesn't make sense.

Dan
 

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RoverHomie said:
gw2doc said:
some people find following wire schematics confusing, others dont, it definetly doesnt need to be a dealer to do it if you dont want to do it yourself.
Thats certainly something way beyond my skill set with electronics.
what about a local LR mechanic?
 

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If you know anyone else with a RR who is willing to let you try this: simply disconnect your NAV computer (it basically just unplugs) then pull a known good one from other RR and connect it to your own. See if the problem persists. Make sure you are VERY careful about waiting until the red light is off before disconnecting these puppies. Optionally you may be able to convince your dealer/shop to try the same thing with a spare part. It should require basically no effort (although same goes for clearing faults and we all know they rip us off for that).
 

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Huh. Sorry, but for some reason I was under the impression that the dealer wanted to replace the head unit when I posted above. :oops:
 
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