Opel Corsa D Help with understanding Immo system

[accchris]

Can some Vauxhall Opel specialist help to explain the operation of the immobiliser system please.
I have the vehicle PIN code which will allow access to Instrument Cluster and Engine ECU but not the BCU. Firstly is the BCU on this vehicle the Fuse Box inside the Car or the Steering Column module.

The problem i have is the Car was presented as a non starter, had been bought with a fire damaged Under dash Fuse Box. customer had bought a replacement unit and had the eprom exchanged by A N other. The Car will not Crank and has the Car with Spanner light flashing in cluster. Live data suggests the key is not coded but holds the correct VIN. I have read the Eeprom from the fuse box and it also has the correct VIN.

Question 1, Does the immobiliser on this car stop it from cranking or just from starting?
Question 2, Why cant i enter the PIN code to program the Key
Question 3, To replace any of these items what would be required, Cluster, Engine ECU, Steering Column Switchs, Fuse Box, Key with Transponder?

Thanks in advance for any advice as dont normally work with Opel.

[plasma533]

Can answer one of them ?'s

The immo will stop the car from even cranking.. The BCU is prone to losing the key data after a flat battery, or even jump starting someone else...

Maybe the BCU hasnt been set up correctly and not using the pincode you should it should have/..

when you say to replace any of these items, what do you mean by the list afterwards? do you mean if you was to replace all the items as like an ECU set?

[accchris]

The Customer had apparently bought another lock set but that was the same, also showing no key coded. But it doesnt have a PIN code.

Was thinking there may have been another problem the car not cranking but you have answered that question.

Perhaps i need to check the settings/ coding of the BCU. I am right in thinking the BCU is the Passenger compartment Fuse Box?

Am i also right in thinking the Steering Column switch module is not coded on the Corsa unlike the Vectra C?

[plasma533]

dont think the steering column unit does much past its function. The BCU sort of takes over the job of the cim like the vectra c does..

light flashing is sure tell tale sign of immo not allowing crank... All items of immo should have matching pin code (dont know exactly which items, as I normally only do vec c's) and keys programmed.

[accchris]

Thought as much, The eeprom on the Fuse Box was 93C86 which read ok and showed the VIN so i pressume this must also hold the PIN Code. Any one know if the Code be extracted from this or only from the cluster?

[plasma533]

yeah pin should be able to be got from it


edit: Just checked my decoder and dont see it on it... Wil wait for one of the others to chip in

edit2: just found this from another thread.

Security code in this BCM (Corsa D ) is encrypted in 93C86 memory, no way to read this.
Encryption key is stored in mcu inside the body.

[accchris]

Bugger, so no way to check. Cant see why it should be different though as VIN matches up.
Think i will read the Cluster from the other set he has and then try swapping and re coding the key for that set up.

[flyins]

Bugger, so no way to check. Cant see why it should be different though as VIN matches up.
Think i will read the Cluster from the other set he has and then try swapping and re coding the key for that set up.

answer to 1, yes car wont crank
2, check security wait time in BCM and if it says I.E. 40mins, leave ignition on until its 0, also if someone just swap 93c86 this may cause you issue.
3, and it all goes like this mate IPC,BCM,SDM (airbag module),and engine ecu, thats everything that allows car to start when immo out of sync.
so to resync car your gonna need your pin and this procedure
Reset IPC
Reset BCM then reprogram a key(yes reprogram key now)
Reset SDM
turn key off now and wait 30 secs

Now reprogram IPC
reprogram BCM and in the immo selection say BCM installed
reprogram SDM
turn key off for 30 secs
then start car and reprogram any other keys
You wont need or shouldnt need to reset engine ecu or even say bcm/ecu installed in the immo selection in BCM, unless someone been messing, so dont reset engine ecu unless you getting nowhere, but you can try the pin to make sure it accepts pin
(Do not reset ECM before or at the same time as BCM is reset, otherwise data about the vehicle's key COULD be lost which would require new key transponders)

OPCOM or VAUXCOM procedure dont matter if orig or not

read pin from SDM (airbag) and reset it with its own pin and not the one from new kit! You can get pin from clocks for the new kit byte swapped aswell so ie see it as 1564 but actual pin is 5146 if from clocks ok,
all the best anyway also theres loads of posts on this if cant find any just P.M. me

[exe123]

BCM eeprom and mcu are one set. Encryption key is there. If they swap over the eeprom the pin is not valid because the value in the eeprom will be decrypted with the wrong key.
Get the original eeprom or get a used virgin BCM.

[accchris]

answer to 1, yes car wont crank
2, check security wait time in BCM and if it says I.E. 40mins, leave ignition on until its 0, also if someone just swap 93c86 this may cause you issue.
3, and it all goes like this mate IPC,BCM,SDM (airbag module),and engine ecu, thats everything that allows car to start when immo out of sync.
so to resync car your gonna need your pin and this procedure
Reset IPC
Reset BCM then reprogram a key(yes reprogram key now)
Reset SDM
turn key off now and wait 30 secs

Now reprogram IPC
reprogram BCM and in the immo selection say BCM installed
reprogram SDM
turn key off for 30 secs
then start car and reprogram any other keys
You wont need or shouldnt need to reset engine ecu or even say bcm/ecu installed in the immo selection in BCM, unless someone been messing, so dont reset engine ecu unless you getting nowhere, but you can try the pin to make sure it accepts pin
(Do not reset ECM before or at the same time as BCM is reset, otherwise data about the vehicle's key COULD be lost which would require new key transponders)

OPCOM or VAUXCOM procedure dont matter if orig or not

read pin from SDM (airbag) and reset it with its own pin and not the one from new kit! You can get pin from clocks for the new kit byte swapped aswell so ie see it as 1564 but actual pin is 5146 if from clocks ok,
all the best anyway also theres loads of posts on this if cant find any just P.M. me

Flyins....You are the Man Thanks very much for your help with this.

Read pin from new Cluster set and reprogrammed as per your instructions.

Guy has had this car sitting for 5 months and numerous people trying to sort it.

Now starts and Runs

[plasma533]

isnt it a good feeling to be able to fix something that other people have tried and failed to

[flyins]

Flyins....You are the Man Thanks very much for your help with this.

Read pin from new Cluster set and reprogrammed as per your instructions.

Guy has had this car sitting for 5 months and numerous people trying to sort it.

Now starts and Runs

Thank you for replying back and letting us know how it went, have a good day, hope you charged well for your time you spent trying to fix this car and actually fixing it. Your the man for going out of your way to learn how to resolve his fault and spend time reading
many thanks flyins

[flyins]

isnt it a good feeling to be able to fix something that other people have tried and failed to

It sure is

[Music73]

Just read this post as was quite interested on how these worked also... again flyins thanks for your procedure I have heard of these throwing out there immobiliser system but didn't know what the procedure was to reset or what modules were incorporated in the immo system... congrats to plasma on the successful fix of his dead car....

Sent from my SM-T533 using Tapatalk

[flyins]

Just read this post as was quite interested on how these worked also... again flyins thanks for your procedure I have heard of these throwing out there immobiliser system but didn't know what the procedure was to reset or what modules were incorporated in the immo system... congrats to plasma on the successful fix of his dead car....

Sent from my SM-T533 using Tapatalk

Theres also an update for bcm, but dont bother with it, just put an 065 battery on it and it be right