Hello everyone,

Let me describe the condition I have encountered yesterday and would be glad if you tell me what it was.

After locking the vehicle (US version, HSE) with a remote, trying to unlock it by pressing the unlock button twice. Rear doors, tailgate and fueld cap door do not unlock. Pressing the unlock button on the console does not help either. Locking/unlocking car with the key - same situation - rear doors, tailgate and fuel cap remain locked.

I drove home, parked car in the garage, connected the battery to maintainer (just in case). This morning, came down, saw that battery is fully charged. Tried to unlock rear door with a remote - same situation. Tried with the second key/remote - no changes.

Then I put the key in the ignition, turned it to position II, but did not start the car. Then turned the key to off, removed the key, closed the door, locked the car. When pressing the unlock button twice on the remote - now rear doors and fuel cap are unlocked. I repeated lock/unlock with the second key/remote - works too. Also checked the button on console - also locks/unlocks all doors.

My questions: what it was, what caused this, how to avoid this happening again and was the procedure to bring back everything to normal right one?

P.S. Does anyone got link to 2005 RR HSE US version manual? I have UK version but number of stuff is missing and different - like remote shown with 4 buttons, while mine is with 3. Found 2002 US version manual but shows AM/FM buttoned dashboard, while mine has screen.

Like these:



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invisible999 said:

Hello everyone,

Let me describe the condition I have encountered yesterday and would be glad if you tell me what it was.

After locking the vehicle (US version, HSE) with a remote, trying to unlock it by pressing the unlock button twice. Rear doors, tailgate and fueld cap door do not unlock. Pressing the unlock button on the console does not help either. Locking/unlocking car with the key - same situation - rear doors, tailgate and fuel cap remain locked.

Click to expand...

BTW, update on that - as it was mentioned in number of threads here and other places - this is mostly due to BCU failure. I replaced BCU with the same part number and the same HW/SW versions from Ebay and problems are gone. Now key remotes don't work any more with the new BCU but I can live without it - physical key locking via door works.

Someone more knowledgeable than I will know whether or not the re-sync procedure will work with the new BCU I'm sure. I've had some BMWs around this age that used the same procedure so I think you may be able to do it and get the remote locking working.

1. Turn ignition to position 2 (don't start the car)
2. Turn ignition off
3. Remove key
4. Hold down the Lock button on the key and press unlock 3 times. Release the lock button

The locks should pulse and then you have a synced key again.

On the E39 BMW I had, I found I had to do both keys at the same time. Well, not the same time but when the locks pulse, you immediately grab the other key, and repeat step 4.

I'm writing this from memory so it mightn't be 100% accurate,I expect there are 100 videos on YT to show you how.

The caveat here is that it may not work as you've replaced the BCU but I think it will as this would be the procedure for a new key. One of the sages will jump in here and correct me if I'm talking rubbish though.

I tried the above procedure about 5 times on each of 2 keys I have. Did not work.

Could it be the case that past keys need to be deleted from BCU first?

I think when you add a new key it deletes the old ones which is why you have to do all keys in the same ignition cycle so I don't think that is it.

These guys say to hold Unlock and press Lock 3 times.

They also cycle the ignition twice


I quite like their videos but I will say that they are often trying it for the first time on camera rather than getting the steps down before making the videos.

I bought a Mercedes ML with this same issue a few years back and found the detail in the handbook on how to do it, it worked perfectly so you may have the info too. Mine has the keyless go and no ignition barrel so I know I don't have that information in my handbook.

I gave up trying. I just use physical key to lock and unlock. Not planning to spend even a cent to fix it.