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MK1 Face lift 2007 boot door unlocks itself WHILE MOVING!!!


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My goodness! I have been hearing more noise from the rear of my Mk1 this week. Like a window was open, and a rattle. The rattle was really irritating me, so I sat in the back while my wife drove. To my horror, the rear door unlocked by itself! I have tried this in a few conditions now. 

 

Static: I manually closed the rear door. Within 40 seconds it unlocked itself, to the point I could put my fingers behind the door and wobble. It appears to still be on the latch, but very concerning. 

 

I then tried it electronically, which closed the boot, locked it. Then unlocked it and the boot moved slightly, again leaving finger space so I could wobble the boot door. 

 

Slowly moving: both manually and electronically I closed the boot door. Jumped straight into the Alphard, Staithes engine and pulled off. I can get about 20 metres and the same result. The boot door unlocks. 

 

 

Disabled electronically assist doors: manually closed and then Jumped in Alphard. Locked all doors with the lock button inside the drivers door. 

 

I moved off, maybe drove 50 metres and the door unlocked itself again....

 

Any suggestions? 

 

Cheers Dan 

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16 hours ago, Alph-bard said:

My goodness! I have been hearing more noise from the rear of my Mk1 this week. Like a window was open, and a rattle. The rattle was really irritating me, so I sat in the back while my wife drove. To my horror, the rear door unlocked by itself! I have tried this in a few conditions now. 

 

Static: I manually closed the rear door. Within 40 seconds it unlocked itself, to the point I could put my fingers behind the door and wobble. It appears to still be on the latch, but very concerning. 

 

I then tried it electronically, which closed the boot, locked it. Then unlocked it and the boot moved slightly, again leaving finger space so I could wobble the boot door. 

 

Slowly moving: both manually and electronically I closed the boot door. Jumped straight into the Alphard, Staithes engine and pulled off. I can get about 20 metres and the same result. The boot door unlocks. 

 

 

Disabled electronically assist doors: manually closed and then Jumped in Alphard. Locked all doors with the lock button inside the drivers door. 

 

I moved off, maybe drove 50 metres and the door unlocked itself again....

 

Any suggestions? 

 

Cheers Dan 

 

Hello Dan,

 

Do you have the Smart Lock System ?

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On 3/20/2023 at 11:52 AM, Rojie said:

 

Hello Dan,

 

Do you have the Smart Lock System ?

Hello Roger, nice to meet you! 

 

I have no idea, could you let me know how I confirm that please? 

 

Cheers Dan 

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2 hours ago, Alph-bard said:

Hello Roger, nice to meet you! 

 

I have no idea, could you let me know how I confirm that please? 

 

Cheers Dan 

 

You will have a separate fob for it. Just three buttons. Lock, unlock and tailgate.

 

The reason I ask is it can, when programmed through the head unit, perform all kinds of tricks with the locking system.

I was just wondering whether it has some bug or other malfunction; perhaps needing a new fob battery.

 

Doors can be programmed to lock after you drive off, etc.

 

 

Is your rear hatch electrically assisted?

 

On another line of thinking, I believe the rear hatch has obstruction detectors. perhaps there is a malfunction there.

 

I am just guessing, as no-one else (in my recollection) has reported such a situation  ! 

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You have electric tailgate? 

Do you have 'soft close' (where a motor pulls door tight if you don't close it fully?) 

 

 

It sounds like the soft close motor is disengaging, maybe a loose connection, or debris in the latch mechanism? 

 

My Softclose had a rattle, I took off the rear plastic trim, and 2 of the screws that hold the lock mechanism had worked their way completely loose! 

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9 hours ago, Rojie said:

 

You will have a separate fob for it. Just three buttons. Lock, unlock and tailgate.

 

The reason I ask is it can, when programmed through the head unit, perform all kinds of tricks with the locking system.

I was just wondering whether it has some bug or other malfunction; perhaps needing a new fob battery.

 

Doors can be programmed to lock after you drive off, etc.

 

 

Is your rear hatch electrically assisted?

 

On another line of thinking, I believe the rear hatch has obstruction detectors. perhaps there is a malfunction there.

 

I am just guessing, as no-one else (in my recollection) has reported such a situation  ! 

This might be spot in then Roger. I do have that fob yes. We had a head unit fitted on the weekend (android upgrade) although the issue was happen beforehand, so I suspect this is unrelated. 

 

It may be the fob, or as you say, sensors. 

 

Fault finding action is required. I appreciate your response and suggestions 😊 

 

Cheers Dan 

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9 hours ago, Chris.ac said:

You have electric tailgate? 

Do you have 'soft close' (where a motor pulls door tight if you don't close it fully?) 

 

 

It sounds like the soft close motor is disengaging, maybe a loose connection, or debris in the latch mechanism? 

 

My Softclose had a rattle, I took off the rear plastic trim, and 2 of the screws that hold the lock mechanism had worked their way completely loose! 

This a a great idea 💡  ok, I will check that Chris!  Roger suggested a couple of potential investigations too. I will look at it this week and report back to the group. 

 

Have a good day, Dan 

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  • 4 weeks later...

Oddly after cleaning tge obstruction sensors the issue has not reoccurred. So, at the moment I belive it was exactly that.. dirty sensors??? Thank you all for your help and pointers, much appreciated 🙏 

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