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Old 02-26-2013, 12:28 AM   #1
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Join Date: Nov 2008
Location: Sydney
Posts: 92
My Ride: 328ci
Door Lock Actuator or GM5 Module?

Hi guys,

im experiencing problem with my Door Locking and Unlocking.
After extensive research, i can only narrow it down to a malfunctioning GM5 module, a bad door lock actuator, or both!

Im leaning towards a bad door lock actuator because...

1. With Remote Key - pressed once i can hear the driver door trying to unlock (making that lock and unlock sound) but the pin wont pop up. on the 2nd press, the passenger door unlock.

2. With all doors unlocked, if i press the Lock button on remote, all doors will lock.

3. Sitting in the car using the Central locking button, i can only do exactly the same as mentioned above.

If i can hear the actuator trying to unlock, but it cant, does it means that the actuator is malfunctioning? Then why does it able to Lock, but cant unlock? Does it indicate a malfunctioning GM5? or both?

Help is much appreciated.
Ultimately if both are faulty, then i have no choice but to replace both.
But it would be good to pinpoint and replace which ever 1st, to see if it resolve the problem

many thanks
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Old 02-26-2013, 12:37 AM   #2
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Join Date: May 2011
Posts: 1,607
This may help you work it out. He explains the symptoms and cause pretty well.

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Old 02-26-2013, 12:39 AM   #3
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Join Date: Apr 2011
Location: Australia
Posts: 2,841
My Ride: 2 dog powered sled
I have a spare gm5 module here if you need it.
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Old 02-26-2013, 01:38 AM   #4
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Join Date: Oct 2008
Location: Melbourne, AUS
Posts: 1,025
My Ride: 328Ci
Same symptoms as mine, was a bad actuator. If you can hear it making noise/slight movement, it's the actuator. Eventually it will fail to lock as well.

Schmiedmann worked out to be the cheapest place for me, be careful when buying from overseas as RHD/LHD ones differ from memory.
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Old 02-26-2013, 01:45 AM   #5
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Join Date: May 2010
Location: Melbourne, Australia
Posts: 411
My Ride: 2002 E46 M3
Originally Posted by Jall View Post
Same symptoms as mine, was a bad actuator. If you can hear it making noise/slight movement, it's the actuator. Eventually it will fail to lock as well.
+1 I had similar symptoms, initially in some circumstances I could hear the door actuator trying to unlock, when I replaced it everything worked as normal again.

Old thread detailing my good experience with Linwar motors in the UK
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Old 03-21-2013, 06:09 PM   #6
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Join Date: Oct 2012
Location: Melbourne, Australia
Posts: 103
My Ride: 05 BMW 330CI M-Sport
The same thing happen'd to me a few days ago, went to the car to get something out and the locked clicked about 4 times instead of 2. The door was opened a closed and now is jammed shut Its being fixed today
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