Home > Technical (L322) > Rear doors will not unlock with key fob |
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doclees Member Since: 24 Jun 2015 Location: PA Posts: 672 |
Bought the 2004 knowing this issue. Rear door locks will lock with key fob but not unlock. I can hear the solenoids working but button doesn't lift. You can open door from the inside. CDL release on the dash (fascia) doesn't unlock the rear doors either. At first reading I thought it was the BCU points style switch needing replacement but I would assume I would have neither lock and unlock if that was the issue.
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3rd Jul 2015 12:03am |
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wealy Member Since: 29 Jul 2013 Location: Kings Bromley Posts: 1020 |
I'm guessing the lock modules have packed up...... But both to go at the same time would be very unlucky. Get in there and strip them down. |
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3rd Jul 2015 7:20am |
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wealy Member Since: 29 Jul 2013 Location: Kings Bromley Posts: 1020 |
Very common on the sport - was an embarrassment for JLR on warranty. |
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3rd Jul 2015 9:09am |
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doclees Member Since: 24 Jun 2015 Location: PA Posts: 672 |
Thanks folks, you people are so much nicer than rangerrover.net. |
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3rd Jul 2015 1:50pm |
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mjdronfield Member Since: 04 Nov 2011 Location: Derbyshire Posts: 7803 |
I had to have a latch replaced on mine for this, as Craig says. Within 6 months the other rear door had the same issue.....
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3rd Jul 2015 5:36pm |
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doclees Member Since: 24 Jun 2015 Location: PA Posts: 672 |
I found that some of these style BMW lock actuators are repairable. There are 2 motors in them. One for lock and one for unlock. If you can get to the motors they are simple $3 (2 quid). These units for the RR dont look too frendly to open. I found 2 new for $75 US each. I will dissect an old one after the new one is in. Often the motors can be cleaned and its good to go. |
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6th Jul 2015 2:26am |
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doclees Member Since: 24 Jun 2015 Location: PA Posts: 672 |
Correction 2 used units. Oh well they work. I will post pictures later. To DX the problem I put an ohm meter to the electrical connection before removing the lock. Pin 7 and 8 power the lock motors and are marked on the connector. The connector has a squeeze type lock. Pinch and wiggle and it will come out. I used long straight pins in the female end of pin 7 and 8. Connect ohm meter and set for 20 volt range. Close doors and use key fob. If current to the connector is intact the volts will be read in both lock and unlock. Essentially ground(earth) is reversed when going from lock to unlock. It appears that both of the lock motors must operate to have enough power to unlock but only one to lock.
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11th Jul 2015 3:01am |
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Cam-Tech-Craig Member Since: 03 Aug 2011 Location: Gloucestershire Posts: 16294 |
Interesting... Thanks for letting us know your findings sir |
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11th Jul 2015 8:42am |
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doclees Member Since: 24 Jun 2015 Location: PA Posts: 672 |
I need to fix my drivers door lock so I tried to find replacement motors for the actuator. Dont let the Johnson name fool you. Its made by a Hong Kong company. I decided to open up the dead motor and try cleaning it again. I noticed the shaft the brushes contact have 3 copper contact areas that should be separated by a gap. My gaps were full of crud. Cleaned them out and the motor seems fine. The hong kong "Johnson" company did not list the motors that could be bought online but possibly through a dealer. I'll keep looking. Much rather buy a $5 motor than a $150 actuator. |
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8th Apr 2016 6:55pm |
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miggit Member Since: 12 Jul 2014 Location: Milton Keynes Posts: 3657 |
It never ceases to amaze me just how many things are "unrepairable" according to the manufacturer, and yet with a bit of enginuity and dogged determination the "unrepairable" item can be brought back to life. Hats off to you Sir, top job, and keep up with the "well I can't brake it cos it's broken.. but I might be able to fix it" mentality, I live by it Yesterday I couldn't spell Engineer... Today I are one!
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8th Apr 2016 9:21pm |
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doclees Member Since: 24 Jun 2015 Location: PA Posts: 672 |
Thanks but its not back together and tested yet and i still need to find a short cut to disassembling the actuator. Maybe with more practice i can get it down to 45 min total fix time it will be worth it. |
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9th Apr 2016 12:29am |
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doclees Member Since: 24 Jun 2015 Location: PA Posts: 672 |
Ok so getting the repair time down is easy but you will need to drill and tap a small hole. More on this later. The problem I am finding is sourcing the motors. One is Johnson (Hong Kong) and the other is Mabuchi (japan). Where they are actually made? Who knows. Neither Johnson or Mabuchi list a motor with the 28mm shaft length. All seem to be 20mm. About $4 each.
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11th Apr 2016 12:00am |
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miggit Member Since: 12 Jul 2014 Location: Milton Keynes Posts: 3657 |
That's beginning to sound like another BMW made under licence and not available to Joe Public sort of thing It might be worth posing the question on a BMW forum... you never know Yesterday I couldn't spell Engineer... Today I are one!
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11th Apr 2016 12:27am |
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PaulTyrer Member Since: 22 Jul 2013 Location: Devizes, Wiltshire Posts: 1254 |
It may not work, but I used to do a lot of slot car racing (scalextric) but we scratch built our own cars. These look very similar to the 12v motors we used. Perhaps look at model shops? Possibly r/c models might have similarly sized motors? |
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11th Apr 2016 7:31am |
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