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trfty Profile
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Date Registered: 08-2021
TOTAL POSTS: 4
Reply | QUOTE
T30 central locking not unlocking but able to lock


Hi, My T30 (2006) central locking works when locking via the key fob any lock button on the drivers door however I am unable to unlock the doors with either method.
While the doors not unlocking is a little annoying, the tailgate not unlocking is a problem.

When I try to unlock via the door button or fob, I can hear a clicking noise coming from what I believe is the TCU (based on my reading of other posts) as it is behind the drivers glovebox, however none of the doors unlock.

Any ideas where I should be looking or would this mean a faulty TCU?
29/Aug/2021, 5:33 pm Link to this post Send Email PM   Send Private Message Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6002
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Re: T30 central locking not unlocking but able to lock


Does this happen with all doors or just all except the driver's door ?
I ask because while they share a common "ground", the driver's door has a separate "power" line.

---
Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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30/Aug/2021, 9:06 am Link to this post Send Email PM   Send Private Message Blog
 
trfty Profile
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Date Registered: 08-2021
TOTAL POSTS: 4
Reply | QUOTE
Re: T30 central locking not unlocking but able to lock


Hi Kev,

This happens across all doors.
All doors successfully lock but no doors unlock.

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Troy
30/Aug/2021, 9:14 am Link to this post Send Email PM   Send Private Message Blog
 
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6002
Reply | QUOTE
Re: T30 central locking not unlocking but able to lock


Try using the key in the driver's door to unlock, turning the key as far as you can.
Maybe you might have engaged the super-lock function.

If this does not work, then chances are that an internal relay power connection is faulty.
All door lock motors only have 2 wires and 12V/Ground is reversed to lock/unlock the doors, so with locking working it shows your wiring and fuses are OK.

---
Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
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30/Aug/2021, 9:57 am Link to this post Send Email PM   Send Private Message Blog
 
trfty Profile
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Date Registered: 08-2021
TOTAL POSTS: 4
Reply | QUOTE
Re: T30 central locking not unlocking but able to lock


I checked the super-lock and that was not the issue.

I've read somewhere before that if the circuit is not ground properly then it wont think it is locked so will not unlock it. I'm not sure if this is the case on the xtrail.

I do hear a clicking noise from the TCU when an attempt is made to unlock electronically and the doors are coming from a locked position. A second attempt to unlock does not make the same noise.

Time for me to get a multi-meter out and pull things apart.
30/Aug/2021, 10:22 am Link to this post Send Email PM   Send Private Message Blog
 


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