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Old 1st May 2010, 13:08   #1
Andy K
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Default Battery Drain / No SatNav & Radio problems

Hi I Have a problem on my X reg R75 ConSE


The standby current is cycling between 700mA - 1A causing a flat battery.

At the same time, the entertainment display has a number of problems.

The font has changed on the Radio and CD displays (see picture). No RDS.

The SatNav option has disapeared from the menu options.
The SatNav CD unit in the boot has the LEDs flashing/alternating and won't eject.

Please help! Any idea's what unit has failed ?




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Old 1st May 2010, 13:11   #2
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It sounds like the SatNav computer is stuffed.

Simply check, open the boot, and the red lamp should go off in less then 60 seconds. Any longer and it's goosed. Don't open or close any other doors as it will restart the shut down cycle.
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Old 1st May 2010, 13:17   #3
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I have had that disply in the past mine was caused by water getting into the sat nav unit or onto the autochangrt in the boot
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Old 1st May 2010, 13:37   #4
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When you say the SatNav computer, is that the thing in the spare wheel well ?

Come to think of it the car was washed hours before the problem happened.
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Old 1st May 2010, 13:42   #5
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No its in the boot on the drivers side.
The boxes in the wheel well are the TV and Radio tuners.

Sat nav may have just got iself confused or has damp inside.
If you remove this following the correct shutdown procedure Leave in airing cupboard or a dry warm place overnight and it may be ok

See below for how to shutdown
http://www.the75andztclub.co.uk/foru...read.php?t=109
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Old 1st May 2010, 14:54   #6
Andy K
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thanks very much.

removing the satnav cd unit has fixed the current drain.

Now 77mA alarm off,
80mA alarm on.


Radio display still odd.

Boot is nice and dry.

At least car driveable now though. Thank you
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Old 1st May 2010, 16:02   #7
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Try a battery reset, BUT FOLLOW THE LINK BELOW
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Old 1st May 2010, 17:01   #8
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Hi all, mine is a tourer, not sure if saloon is the same. A thimbleful of water was running into the cradle that holds the sat/nav unit via loose nuts under the fuel filler cap. these nuts secure the cradle to the car and caused me alsorts of problems (wipers goin, indicators flashin, alarm goin) was like having a disco outside my window ! Silconed and tightened nuts... sorted ! Regards Mark
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Old 1st May 2010, 20:20   #9
Andy K
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If I need a new CD satnav unit, do the BMW ones work without reprogramming ?
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Old 1st May 2010, 21:15   #10
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My Sat Nav suffered exactly the same symptoms after a car wash recently.

I removed the Navigation Computer drive, and found the bottom of the bracket was wet (as was the CD unit itself)

When I removed the bottom casing, I found this:



The reason the display looks different, is that the nav computer normally supplies all the screen menu's itself, but when the Sat Nav unit goes off line (or dies), there is a back-up menu function contained within the video module in the spare wheel well, that takes over with a cruder display.

Time for a replacement Nav Computer I think Andy, and yes a BMW unit is a direct swap but as you have probably got a Mark II computer, you'll need to disconnect the GPS Receiver unit (or Trimble) before you can use the BMW one. It's quite simple to do, don't worry. If however your dead nav computer was a Rover Mark III, it's a staright swap over.

the Mark II looks like this:



and the Mark III looks like this:



I can explain what to do, if you get to that stage later on.
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