P38A remote central locking not working

kermit_rr · Oct 21, 2020

For a while, I've had to press the unlock button before the lock button would do anything, now neither button does anything! The red light flashes but that is all.
Central locking works and operates on all doors. The antenna is plugged in to the receiver so the passive coil should talk, can't see any dud fuses. Any ideas?
I had previously disabled engine immobilizer so i can still drive!

RangeRoller dt · Oct 21, 2020

Try new batteries in fob

kermit_rr · Oct 21, 2020

Batteries were fine, new ones haven't helped

kermit_rr · Oct 21, 2020

Still only got one fob, so can't try another

Grrrrrr · Oct 22, 2020

kermit_rr said:
For a while, I've had to press the unlock button before the lock button would do anything, now neither button does anything! The red light flashes but that is all.
Central locking works and operates on all doors. The antenna is plugged in to the receiver so the passive coil should talk, can't see any dud fuses. Any ideas?
I had previously disabled engine immobilizer so i can still drive!

Key fob lost sync?

DanClarke · Oct 22, 2020

If you have nanocom, clear the RF memory. That always fixes mine.

kermit_rr · Oct 22, 2020

Grrrrrr said:
Key fob lost sync?

DanClarke said:
If you have nanocom, clear the RF memory. That always fixes mine.

i thought it could be a sync problem, but resyncing doesnt help. will try clearing the memory

Mark Piercy · Oct 22, 2020

kermit_rr said:
i thought it could be a sync problem, but resyncing doesnt help. will try clearing the memory

I was worried about clearing the rf memory incase it all went tiddles up!!
What does it do? Clears what from the memory?

kermit_rr · Oct 22, 2020

Mark Piercy said:
I was worried about clearing the rf memory incase it all went tiddles up!!
What does it do? Clears what from the memory?

i've done this before, also outstation memory when i had an eSeat fault code - seat works fine but the current fault said it wasn't working at all. fault went away!

my understanding, might be wrong, clearing RF memory 'forgets' which fobs have been used

Mark Piercy · Oct 22, 2020

kermit_rr said:
i've done this before, also outstation memory when i had an eSeat fault code - seat works fine but the current fault said it wasn't working at all. fault went away!

my understanding, might be wrong, clearing RF memory 'forgets' which fobs have been used

But you don't have to reprogram the fobs into the car again? Essentially the memory is just to remember faults and is not used to remember the fob signatures?
Dumb questions, sorry.

kermit_rr · Oct 22, 2020

I've not had to do that. When I've cleared in the past, the fob has still worked without any further actions

Mark Piercy · Oct 22, 2020

kermit_rr said:
I've not had to do that. When I've cleared in the past, the fob has still worked without any further actions

Excellent, thank you.

kermit_rr · Oct 22, 2020

Mark Piercy said:
Excellent, thank you.

Clear RF memory: To be used in conjunction with the READ RF MEMORY function. This
resets the memory, which stays reset until a valid fob code has been received by the
BECM. These then stay set until reset with this function.

kermit_rr · Oct 22, 2020

Read RF memory: This will confirm if the BECM has received a valid radio frequency (RF)
transmission since it was reset with the clear RF memory function. Although a key fob
may transmit it may not be sending the same Fob code as that stored in the BECM. This
test confirms that the correct fob signal has been received.

Mark Piercy · Oct 22, 2020

That makes sense.

kermit_rr · Oct 22, 2020

well. cleared RF memory, no luck
afterwards, it did say it had received a valid signal, so the fob must still be working

RangeRoller dt · Oct 22, 2020

Have you tried it somewhere other than outside the house? Wondering if some stray signal is blocking it.
If it works off the key has to be signal related

marjon · Oct 22, 2020

If the fob is working and the RF is getting a correct signal (read at the BECM or RF ? ) then why is it not outputting signal to the CDL.

So maybe some investigation into connections further along the line. from BECM to CDL.

Does Nano have a function that you can operate the CDL ? (that's a question) as I would think that would pulse through the BECM.

All just question/ideas as I don't have Nano.

J

DanClarke · Oct 22, 2020

Mark Piercy said:
I was worried about clearing the rf memory incase it all went tiddles up!!
What does it do? Clears what from the memory?

As far as I know, the memory holds the most recent rolling codes the security system has seen from the fobs. I have had many instances where one (or other) of my two fobs has stopped working (kept in a drawer and not used often) stops working, or rather the fob works but its rolling codes are out of the acceptable "range" the security system will recognise. Clearing the RF memory has ALWAYS brought BOTH fobs back into operation.

kermit_rr · Oct 22, 2020

Is CDL an ECU? Where would I find it?
It's not worked in several locations, so unless the p38 is the source of interference then this is ruled out

P38A remote central locking not working

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