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Old 09-19-2014, 07:01 AM   #1
Arturito_Bxl
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Join Date: May 2014
Location: Brussels, Belgium
Posts: 6
My Ride: 320 CiC '04 M-Pack
Expert advice is needed on electronic module

Good morning,
This is my first post on this fantastic forum with so many knowledgeable people sharing experiences.
I have already had 2 BMs and now my baby is a 320 Ci cabrio E46 and I'm having the following fault symptoms:

- electric external mirrors do not work !!
- alarm triggers with no reason
- trunk lid (release button) at times fails to open
- glove compartment lock generally fails to open (even with a new OEM handle)
- internal central lock (pushdown button) sometimes fails to open

My mechanic is of the opinion that an electronic module is responsible for these flaws.
Is a new (or repaired) GM5 module the right fix for those flaws?
A big thank you for your cooperation and help.
Regards from sunny Belgium.
Arturo
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Old 09-29-2014, 02:11 AM   #2
Greg330CI
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Join Date: Nov 2010
Location: Australia
Posts: 42
My Ride: E46 330CIc
The GM5 module controls various functions including central locking and mirror operation. The usual symptom of a failing GM5 is that the door locks fail to release / lock using the key remote and the door button inside, so you have to open the drivers door with the key and opening the passenger doors with the inside door handle. The problem with the GM5 is that the small relays that control the functions and power the actuators burn out. The relays can be replaced but it requires unsoldering them and soldering in new relays. This is quite difficult if you do not have professional soldering equipment or skills. Take a look on the Bimmerfest forum and search for GM5. There is a good write up and photos on the subjecy. You can buy the relays from a guy called Scott in the US. He can also repair the GM5 for you but not so easy if you are in Belgium. I bought the relays from him. I removed the GM5 and removed the PCB. I got a local electronics repair shop to do the removal / replacement soldering and it worked fine. If you replace the GM5, firstly they are expensive (new) and you will have to take the car to a dealer to have it re programmed to your vehicle as it has the vehicle options programmed into it. Hope that helps. Good luck!
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Old 09-29-2014, 05:15 AM   #3
Arturito_Bxl
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Join Date: May 2014
Location: Brussels, Belgium
Posts: 6
My Ride: 320 CiC '04 M-Pack
Dear Greg, Thank you very much for your comments and for sharing your experience and knowledge on this issue. Eventually I've found an electronic engineer in the UK who will repair and reprogram my GM5 for one fifth of the price charged by an official dealer. With best regards from cloudy Brussels.
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