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  #11  
Old 01-09-2019, 02:12 PM
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Quote:
Originally Posted by Qsilver7 View Post
There is another way to "test" the ignition switch. If you start the car, turn on some electrical consumers (like the radio and headlights)...then reach over and lower the passenger sun visor...then open the mirror cover.

If odd electrical gremlins occur when you slide the mirror cover open...there's a 99% chance that the issue is the electronic ignition switch.

Never heard of this before. Great info as always Qsilver7. Stored in memory banks...
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  #12  
Old 01-09-2019, 02:54 PM
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Never dreamed the sun visor would do that when it was messing up but considering how crazy the cars act when the switch starts to fail it doesn't surprise me
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  #13  
Old 01-10-2019, 11:46 AM
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Originally Posted by Qsilver7 View Post
Check out some of these videos below and see if they are similar to what you're experiencing...do the visor test to see if you can get the gremlins to replicate themselves.




https://youtu.be/T7gMUrAvcIE

https://youtu.be/YYqI6sCKVD8

https://youtu.be/nTwNTurMKpY

https://youtu.be/LtJGoOakY7k
Brilliant! Says it all really

Sadly it had no effect on my issue. I unplugged the battery again in the hope (false) that it might go away...

Thanks for the tip though. Appreciated!
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  #14  
Old 01-10-2019, 11:58 AM
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Ok the battery part didn't work what about the sun visor test?
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  #15  
Old 01-10-2019, 12:23 PM
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Quote:
Originally Posted by Qsilver7 View Post
There is another way to "test" the ignition switch. If you start the car, turn on some electrical consumers (like the radio and headlights)...then reach over and lower the passenger sun visor...then open the mirror cover.

If odd electrical gremlins occur when you slide the mirror cover open...there's a 99% chance that the issue is the electronic ignition switch.

There's multiple videos on youtube that show the odd electrical gremlins that can occur if you have a failing ignition switch and you do the sun visor test.



Check out some of these videos below and see if they are similar to what you're experiencing...do the visor test to see if you can get the gremlins to replicate themselves.




https://youtu.be/T7gMUrAvcIE

https://youtu.be/YYqI6sCKVD8

https://youtu.be/nTwNTurMKpY

https://youtu.be/LtJGoOakY7k
I agree to start with eliminating the ignition switch as the culprit. There are plastic 'ramps' that close contacts that wear out. If it is the switch it may get to the point that it won't start, the dash will go black and won't even get that miserable click sound.
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Old 01-10-2019, 03:38 PM
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Originally Posted by bcredliner View Post
I agree to start with eliminating the ignition switch as the culprit. There are plastic 'ramps' that close contacts that wear out. If it is the switch it may get to the point that it won't start, the dash will go black and won't even get that miserable click sound.
The sun visor did not have any effect.

There have been occasions where turning the key did nothing. Usual signs of life from the dash but no engine start. I would move the gear stick to neutral to roll forward a bit and then it would start. I put that down to the starter motor though. Could that be a sign of the ignition switch?

Maybe its worth replacing anyway.
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Old 01-10-2019, 04:38 PM
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I would hate for you to spend money on a new iggy switch and it didn't solve the issue. But again, its the odd electrical (seemingly unrelated) isssues that you're having that seem to be a common iggy switch failure.


The e53 (unlike it's e38 & e39 generational cousins) uses the K-bus for the PM-SM (this controls the driver's seat and steering wheel column)...whereas the 5 & 7 series communicates these commands over the P-bus. I wonder if that may be the reason the e53's sun visor test doesn't cause these issues to replicate themselves.



There are lots more videos on youtube though...that show brake lights not turning off and false check control warnings etc.


Some have even cleaned their ignition switches to fix the issue, too...which saves the cost of purchasing a new one.



{e53 PM-SM & K-bus communication}







{e38 & e39 PM-SM & P-bus communication}


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  #18  
Old 01-10-2019, 05:33 PM
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Mine did all kinds of crazy stuff when the ignition switch was going out. Its one of those if you haven't changed it in years of owning or you don't know how long its been its worth changing it.

It was $80 I think and brings great piece of mind. It can leave you stranded if it goes out all the way.
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  #19  
Old 01-10-2019, 05:35 PM
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  #20  
Old 01-10-2019, 05:42 PM
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Quote:
Originally Posted by w3it View Post
The sun visor did not have any effect.

There have been occasions where turning the key did nothing. Usual signs of life from the dash but no engine start. I would move the gear stick to neutral to roll forward a bit and then it would start. I put that down to the starter motor though. Could that be a sign of the ignition switch?

Maybe its worth replacing anyway.
I have had to replace a bad ignition switch where the sun visor test did nothing. As mentioned when it does work it is 99% of the time a bad switch. But if it doesn't the switch can still be bad. I wouldn't want you to buy an ignition switch and that not be the problem either but symptoms match up to a bad switch.

As far as worth replacing-- if your X5 has in excess of 100,000 miles on the original switch you can call it PM.
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