BMW E91 Diversity Antenna Module Voltage Test Troubleshooting

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If your remote fob key doesn’t open and lock the car & comfort access doesn’t work. Then it could the wiring that runs to the trunk lid that is broken. It could also be that water has got into your diversity antenna and fried the microchip. I had both! The wires from an old Apple laptop power adaptor are what I used to repair mine, standard wires are too brittle and will break again.

Опубликовано:

26 янв 2021

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Комментарии : 17

@linus5699 Год назад

Is the second wire for output signal? I have O volts , and not sure if it is a broken wire problem, or diversity antenna problem.

@DevinGoodwinlv 2 года назад

is there a part 2 to the video? it kinda ended a bit too quick

@xmagic4516 Месяц назад

My car lose the 12v tension from the top first wire after 1-2 minutes. I mean if is activated from that button,it will work but if you leave it for like1-2 mins,it loses… Tried with another unit and it does the same thing. Maybe both units are dead. Any suggestion pls ? Checked the battery from the remote,it stays like 2,96-3v. A deep looking at the cables ?

@cognote 2 года назад

Hello! thanks for your video... I have checked the readings with the voltmeter and are very similar to your "good" unit... shall I give it a go and replace the module still?... its driving me nuts not having the rm operational....

@rikobananas6 2 года назад

Check everything else first like your remote battery. Have you already replaced the wiring?

@danlongson8719 7 месяцев назад

My first cable is nowhere near battery voltage. Is this most likely cable damage as i have already replaced diversity antenna

@OmarShaffi 2 года назад

Both of my fobs are not working and all fuses seem fine. I’ve opened up the diversity antenna and looks pristine and dry no corrosion etc. I tested the voltage on the pins you did and only had one live with around 4v. Is this the supply side and is it likely that the wiring near the hinge has been ruptured?

@rikobananas6 2 года назад

I would investigate your wiring.

@lewisgarrott5389 Год назад

mine only works near the trunk..what should I check?

@larsmadsen8678 2 года назад

I got 0 volts on everything but nr4.. is it fair to guess that I have broken cables?

@rikobananas6 2 года назад

At the point when I shot my video I had already replaced the wiring. The broken wire or water ingress caused the failure of my diversity antenna. Replace the wiring first then see if your fixed, if not then next phase is check the voltages on the antenna

@rikobananas6 2 года назад

If you just pull back where the grommets seal to the body and then give a pull on each wire individually you’ll probably find the broken wires pull out