P38A Central locking query

Flossie · 2024-08-31T10:38:44+0100

I'm sure , fairly sure anyway, that I had this issue before, posted it somewhere on this site and @Datatek answered, seem to recall it was probably a sticky latch micro switch. Spent over an hour searching for my post on 'what have you done on your RR today' and cant find it.
im not even sure the issue i had back then is the same as the issue i have now.
went to lock her off the remote, led flashes but no locking, went back to it a while later with the spare fob and same thing. Put the key in the lock and it locked and unlocked fine. Tried the fobs again and everything is back to normal.
Sticky micro switch?

Grrrrrr · 2024-08-31T11:10:34+0100

Sounds plausible.

Or a driver's door rod was rubbing against something and the motors couldn't quite overcome it.

Rubberknees · 2024-08-31T11:34:52+0100

Grrrrrr said:
Sounds plausible.

Or a driver's door rod was rubbing against something and the motors couldn't quite overcome it.

I've had latch that engages striker plate sticking. Just needed penetrating fluid and drop of 3in1 oil and sorted

pwood999 · 2024-08-31T11:53:13+0100

Probably time to do the latch microswitch testing. Do each test a couple of times, in case the microswitch actuation is intermittent.

Flossie · 2024-08-31T12:04:23+0100

pwood999 said:
Probably time to do the latch microswitch testing. Do each test a couple of times, in case the microswitch actuation is intermittent.

Just went to download that and my phone is asking if I want to download again. I remember now doing those tests on a mates 38 with a dead door,maybe 2 yrs ago, that ended up being 2 broken wires from the A post to the becm under the sill step cover thing. Marty helped with that one over on p38 pub.

pwood999 · 2024-08-31T12:16:19+0100

If you have a Nanocom, you can use the BECM Inputs menu to show the microswitches. That will prove the latch to outstation , as well as the outstation to BECM. Then if something isn't working, take the doorcard off & do the continuity checks.

The door switches should show 12V normally, and GND when you do anything with the latch. Keyswitch should toggle on both locking & unlocking. CDL will show locked or unlocked. Door ajar is what it says !!

Flossie · 2024-08-31T12:59:18+0100

pwood999 said:
If you have a Nanocom, you can use the BECM Inputs menu to show the microswitches. That will prove the latch to outstation , as well as the outstation to BECM. Then if something isn't working, take the doorcard off & do the continuity checks.

The door switches should show 12V normally, and GND when you do anything with the latch. Keyswitch should toggle on both locking & unlocking. CDL will show locked or unlocked. Door ajar is what it says !!

View attachment 324906

Well, I'll go to the bottom of my stairs!
Yes, got nano but not tech savvy and I don't think I've seen that menu before.Dont have to get it out very often though as my 2001 td is proving quite reliable. Used it to set timing modulation and diagnose a faulty pot on a blend motor and that's it really. Nearly everything I've had to do has been mechanical stuff and a valve block rebuild.
Might have a play later if I get done, what I'm currently doing, early enough.
Thanks.

pwood999 · 2024-08-31T13:48:49+0100

Def try the Nanocom then. Plug it in, but leave ignition off.

Then navigate menus to P38 / EDC / Right Arrow Twice / BECM / Inputs / Door-Locking /

1st screen shows front door ajar switches.
2nd screen shows rear doors, key switch & CDL (Central Door Locking).
3rd screen shows bonnet & tailgate.

Like this:

Datatek · 2024-08-31T16:05:12+0100

Flossie said:
I'm sure , fairly sure anyway, that I had this issue before, posted it somewhere on this site and @Datatek answered, seem to recall it was probably a sticky latch micro switch. Spent over an hour searching for my post on 'what have you done on your RR today' and cant find it.
im not even sure the issue i had back then is the same as the issue i have now.
went to lock her off the remote, led flashes but no locking, went back to it a while later with the spare fob and same thing. Put the key in the lock and it locked and unlocked fine. Tried the fobs again and everything is back to normal.
Sticky micro switch?

Sticky/ failing micro switch is most likely. Today, mine thinks the drivers door is open all the time, strangely the suspension seems to be working.

P38A Central locking query

Flossie

Well-Known Member

Grrrrrr

Technician, Bodgit & Scarper Ltd

Rubberknees

Well-Known Member

pwood999

Well-Known Member

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Flossie

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Flossie

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