With the alarm going off the engine will not crank and if you have the message "Engine Disabled" on the diesel it also will not crank. The immobiliser is not relevant in the above cases. I suspect but do not know that the same applies to the V8.It means the engine ecu does not need any permission from the BECM to run. Now I would consider that an immobiliser bypass.
If all the BECM security was going off including the Alarm siren you could still start it
We really don’t know in this case what is what but things point towards it.
J
The EKA code can not be read with Nanocom but there should be a FOB code in the BECM RF memory.
My "theory" is that you have the P1668 because the BECM cannot accept the codes sent to it by the RF receiver, because no RF code base pairs are lodged in the BECM for it to run its "matching" algorithm against, so it sees this as a serial link data fault because it expects the Key-fob-code base pairs to be workable for comparison. As they are not there is has no way to understand this other than "serial link fault ".
Good thinking about the lack of a received FOB code in the BECM. Not sure how you would know that the EKA codes are missing though, the cannot be seen in a locked BECM as far as I'm aware.
Really? I can see mine and showed it to @domlinson for comparison. But, my BeCM is probably unlocked, his appeared to be too!
Apart from the cranking (due to your wiring), that exactly matches the behaviour of Otto.
That 30 seconds business must be unique to the V8, it certainly doesn't apply to my 2 diesels as I tried it yesterday.
As I said earlier the set up on this particular car is a bit "hooky".
The text below from the BeCM user guide from Black-Box Solutions (also attached as a PDF).
· Immobilization Code: Only used on EDC andMotronic engineManagement Systems
(EMS). When the ignition is turned on, the BECM, providing it is in receipt of a valid
mobilization code, from receiving an unlock signal from the correct key fob or having its
EKA code entered, and is therefore not in an alarmed or immobilised state, sends a
coded signal to the Engine Management System (EMS) ECU and in turn, the EMS ECU
then compares against a code it already has stored in it. If the two codes compare OK,
the EMS ECU allows the engine to start. This forms the basis of the immobilizer. If the
EMS ECU or the BECM is replaced, the two codes will not match and it will not be
possible to start the engine. It is therefore necessary to synchronize the codes in both
the BECM and the EMS ECU. For EDC, a function can be found in the EDC section which
gives the fixed code from the EDC ECU which must be entered here. For GEMS, any
number can be used here as the GEMS ECU has a learn function located in the OTHER
section which can be used to force it to learn this code. A valid number is between 0 and
65535.
· EKA number: This is the Emergency Key Access (EKA) Number for this vehicle. Only
available on unlocked BECM's (see BECM STATUS). Even if the EKA function is disabled
(see PASSIVE EKA) and therefore not used, each BECM still has a number programmed
into it. The number has to be 4 characters long, each character can be a number
between 1 and 6, and the four numbers cannot be all the same.
· FOB code: For security this information is only available to be read or programmed on
unlocked BECM's (see BECM STATUS). The fob code is a 3-part code, which uniquely
identifies the family of key fobs (key 1, key 2, etc.) that go with this vehicle. Any key Fob,
when pressed, transmits its unique electronic ID code (FOB CODE) in an encrypted
format. The BECM of any vehicle within range of that key fob decrypts the received
transmission and compares the FOB CODE that was received, against the FOB CODE that
is stored here. If the two match, it will accept the key as valid and perform the relevant
task (lock, unlock, send mobilize signal to engine ECU, etc). This FOB CODE is derived
from converting the manufacturer's Bar Set Lock code. This is a 14 digit alphanumeric
number, which is printed on a label that accompanies every new key fob or lockset.
When the vehicle was assembled at the factory and was first fitted with its new lock set,
the Bar set lock code was recorded along with the vehicles VIN number; this can be
obtained from your local dealership by quoting the Vehicle's VIN number. If the bar set
lock code given by the dealer is no longer correct for the vehicle (due to an earlier
replacement of the lockset and where the kept records were not updated), there is then
no alternative but to replace the lockset and use the bar set lock code that comes with
it. When you have the bar set lock code, do not attempt to enter this directly, but email
this code to [email protected] who will then convert the bar set lock
code into a the 3-part FOB CODE. This FOB CODE is then entered in this section. The FOB
CODE can only be obtained by this method. NOTE.DO READ THE BECM STATUS
REGARDING THE BECM BEING LOCKED OR UNLOCKED. THE BECM CANNOT BE
UNLOCKED USING THE NANOCOM EVOLUTION
Cheers!
Not sure about that TBH.
Not sure about that TBH.
I just connected up my Nanocom and navigated to the page where it tells me specifically that my BeCM is "Unlocked" (we should have gone here when looking at yours, my bad)
View attachment 275745
and here in the BeCM it has my immobilisation, code, EKA (edited by me earlier) and fob-codes for decoding and working with the immobiliser.
View attachment 275746
Happy to jump back into your BeCM and see if your is indeed unlocked.
Immobilisation and EKA turned off
Lucky that I did that as the FOB stopped working last Friday. No worries in with the Key and away
Otto won't crank when out of the 30 second window, which I think is correct. Never tried starting except in neutral or park.
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