Weird No Reverse Lights/No PDC but transmission works??

aquik92 · 05-31-2020, 01:08 PM

I posted another thread before but didnt include details and left it very vague but now im armed with more info, so here goes.

So I dont have reverse lights, no PDC (neither acoustic or visual via idrive) and no auto tilting of the passenger side mirror BUT I have no error codes, R is displayed in instrument cluster, displayed via LED on the shifter and transmission works flawlessly. The strange thing is that once in a blue moon, all those issues WORK for around a second and all disappear immediately, without continuity, without warning. All this without any codes of any kind. When I bought the car, i had codes for reverse light bulb failure but did an LCI taillight retrofit and coded those checks out.

I attempted INPA for any activations which might show me if the car is recognising R, checked the wiring on the gear lever, checked wiring in the trunk, no breaks and checked fuses but all are good.

https://www.youtube.com/watch?v=y2o07Lzamu0&

In the link posted, the car was constantly in reverse, and if you notice, the idrive screen flickers, as if its got a bad ground or not enough power? Battery not even a month old.

I believe I can solve this, basically what i would like to know is how the R signal operates in an auto transmission because if its working, even if sporadically, all things are in place and its a question of something which isnt quite connected.

Any help appreciated. Thanks!

ctuna · 05-31-2020, 01:14 PM

You need to post this in the General Forum this is not about
Audio/video bluetooth or entertainment electronics.

Always check the battery voltage before you troubleshoot on these
doesn't matter if it's new or not. Because these cars are battery hogs
and can suck a battery down really fast . And if you have a low battery
you will get all kinds of ghost errors that aren't real.

Although the 330 did not have the Cabin Fuse Box connector recall
it is worth checking out that it's not a problem.

05-31-2020, 01:08 PM	#1
aquik92 New Member 3 Rep 13 Posts Drives: BMW E92 330i Join Date: May 2020 Location: Malta iTrader: (0)	Weird No Reverse Lights/No PDC but transmission works?? I posted another thread before but didnt include details and left it very vague but now im armed with more info, so here goes. So I dont have reverse lights, no PDC (neither acoustic or visual via idrive) and no auto tilting of the passenger side mirror BUT I have no error codes, R is displayed in instrument cluster, displayed via LED on the shifter and transmission works flawlessly. The strange thing is that once in a blue moon, all those issues WORK for around a second and all disappear immediately, without continuity, without warning. All this without any codes of any kind. When I bought the car, i had codes for reverse light bulb failure but did an LCI taillight retrofit and coded those checks out. I attempted INPA for any activations which might show me if the car is recognising R, checked the wiring on the gear lever, checked wiring in the trunk, no breaks and checked fuses but all are good. https://www.youtube.com/watch?v=y2o07Lzamu0& In the link posted, the car was constantly in reverse, and if you notice, the idrive screen flickers, as if its got a bad ground or not enough power? Battery not even a month old. I believe I can solve this, basically what i would like to know is how the R signal operates in an auto transmission because if its working, even if sporadically, all things are in place and its a question of something which isnt quite connected. Any help appreciated. Thanks!
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05-31-2020, 01:14 PM	#2
ctuna Lieutenant General 2045 Rep 13,359 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	You need to post this in the General Forum this is not about Audio/video bluetooth or entertainment electronics. Always check the battery voltage before you troubleshoot on these doesn't matter if it's new or not. Because these cars are battery hogs and can suck a battery down really fast . And if you have a low battery you will get all kinds of ghost errors that aren't real. Although the 330 did not have the Cabin Fuse Box connector recall it is worth checking out that it's not a problem.
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