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DISCO3.CO.UK > Technical (D3)

driver's door lock - computer or latch problem?

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neavsie

Member Since: 23 Oct 2009
Location: Weston CT
Posts: 9

driver's door lock - computer or latch problem?

I posted this issue on RetiredBob's recent thread so thought I'd repost as a separate item.

.... all the doors on my D3 unlock with the remote & dash button, and all door except the driver's door lock with the remote & dash button. The dealer indicated the problem wasn't with the latch mechanism but with the computer sending the instructions to the latch.

The price for fixing the problem was $800 for a new computer plus labour. I cheaped out and now use the key to manually lock the door.

Does this set of facts make sense or is the issue simply the latch itself?

edit: typo corrections

Last edited by neavsie on 3rd Nov 2009 7:51 pm. Edited 1 time in total

3rd Nov 2009 6:50 pm

DG
Site Moderator

Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50947

Check the latch by locking the motor (with you inside) and then pulling the relevant door handle ...if the door opens it's not likely to be the latch

EDIT: forget that ...just re-read and locking is the problem rather than unlocking

21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021

3rd Nov 2009 6:57 pm

neavsie

Member Since: 23 Oct 2009
Location: Weston CT
Posts: 9

Well I tried the process anyway which gave me one more observation. As far as I can tell, there is no noise coming from the latch when I hit the lock button, though given the ability to unlock, there is a corresponding noise from the lock. Not sure this aids with the diagnosis....

3rd Nov 2009 7:16 pm

Disco_Mikey

Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20733

2005 Discovery 3 TDV6 HSE Auto Cairns Blue

Sounds like the Latch is faulty. Never heard of an ECU being replaced to fix that... My D3 Build Thread

TDV8 Retrofit Build Thread

3rd Nov 2009 7:33 pm

DG
Site Moderator

Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50947

Can't put too much info on here about how the locking system works TBH ...but

Quote:
To enable the SPE (single point entry) function, the lock motor in the driver door latch is operated by two dedicated connections with the CJB (central junction box)

Also appears that there should be some specific DTC's available ...most that refer to the drivers door lock in an unlocked state suggest a relay issue.

Hopefully someone more technical be along soon to assist further

21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021

3rd Nov 2009 8:22 pm

neavsie

Member Since: 23 Oct 2009
Location: Weston CT
Posts: 9

thanks for the responses gents.

would seem odd that the ECU would stop sending out messages to lock a single door. is the relay integrated into the latch mechanism itself? any chance its an issue with the wiring loom and anyway a ludite like me could check either of these possibilities?

3rd Nov 2009 8:31 pm

DG
Site Moderator

Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50947

I do believe the relays are in one of the junction boxes

21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021

3rd Nov 2009 8:54 pm

neavsie

Member Since: 23 Oct 2009
Location: Weston CT
Posts: 9

Thanks for the response. Would you know where to get a description of the relays in the CJB? The user manual is vague to say the least! I see two items on the engine bay JB that have a key symbol - R13 and fusible link 11. Not sure if these are the 2 previously mentioned.

3rd Nov 2009 10:16 pm

neavsie

Member Since: 23 Oct 2009
Location: Weston CT
Posts: 9

well, i did some fiddling and swapped relays with the same part number with the R13 relay. ditto with FL11, though this didn't fix the problem. am loathe to swap out the latch if there's a chance its something else. any thoughts on next steps? thanks

5th Nov 2009 1:24 pm

ridgeback_moor

Member Since: 11 Mar 2008
Location: Gateway to the Moors
Posts: 1789

2010 Discovery 4 3.0 TDV6 HSE Auto Stornoway Grey

If the other latches are working OK, I'd put money on the fault being in the latch mech for that door. There are 2 small motors in each latch mechanism - one for the lock mechanism and the other for deadlock I think.

Click image to enlarge

The latch itself is cheap - about Â£34 in UK (cheapest) - probably 2 hours labour to get it changed.

Admin note: this post has had its images recovered from a money grabbing photo hosting site and reinstated

Previously:
2005 D3 2.7 TDV6 S
1984 90 2.25 Petrol CSW
1992 90 200TDi Hard Top
1995 Discovery ES 300TDi
2003 90 TD5 Truck Cab

5th Nov 2009 1:42 pm

neavsie

Member Since: 23 Oct 2009
Location: Weston CT
Posts: 9

appreciate the response. think i'll bite the bullet and have a stab at changing the latch. might change the door panel while I am about it as its looking a little tired...

5th Nov 2009 1:51 pm

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