[MasterMulder]

No, it does not look good. Inside very dirty, and at least one big pin seems discolored.

Open this plug, you will have two wire/green pairs of wiring.

Connect temporary white with white and green with green. Is comms restored between ECM and BCM?

If so, program BCM back. Do not reset any other module, before its too late and you need new parts.

Opel / Vauxhall had provided in those days, a full cover for the abs pump and its connector. To prevent water and dirt ingress.

Hi, so: 120OHMs on ECU, ECU CONNECTOR, ABS CONNECTOR ON BOTH COUPLE OF CABLE. The CAN error comms persists. The DASH connector CAN resistance is around 26 OHMs, so I think the problem is between the IPC and BCM cables? That’s why the IPC doesn’t program itself with the code?

[liviu2004]

In this vehicle, BCM is acting as a gateway. The part between ECM, ABS, TCM( if fitted) and BCM is high speed CAN, the part between BCM and IPC is low speed CAN.

I don't see how a failure in low speed CAN could affect high speed CAN.

In the absence of an oscilloscope, to see the CAN waveform, you will have to start swapping parts and see what restores comms.

IPC get programed by k-line. I suspect bad programmer.

Nothing in this vehicle gets programmed by CAN.

[MasterMulder]

In this vehicle, BCM is acting as a gateway. The part between ECM, ABS, TCM( if fitted) and BCM is high speed CAN, the part between BCM and IPC is low speed CAN.

I don't see how a failure in low speed CAN could affect high speed CAN.

In the absence of an oscilloscope, to see the CAN waveform, you will have to start swapping parts and see what restores comms.

IPC get programed by k-line. I suspect bad programmer.

Nothing in this vehicle gets programmed by CAN.

Bas programmer is impossible cause I use an official TECH2. I can try swapping the BCM with another one. But it’s strange that the resistance values are ok and still no communication between ECM AND ABS.I bought a full block from a Tigra, except ABS. Now I can try with another BCM from my other Corsa C. 

Thanks for your help.

[liviu2004]

The end resistors are just that, resistors, placed between CAN H and CAN L. However, it can happen that CAN transceivers go bad in time.

For example, see this case study I made a while back, but CAN is known to fail in many many ways.

See also a few youtube from Automotive Test Solutions of Bernie Thompson, he is good.

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[MasterMulder]

The end resistors are just that, resistors, placed between CAN H and CAN L. However, it can happen that CAN transceivers go bad in time.

For example, see this case study I made a while back, but CAN is known to fail in many many ways.

See also a few youtube from Automotive Test Solutions of Bernie Thompson, he is good.

Really thanks for your help. So, yesterday night I tried to restore IPC communication,I opened the BCM compartment and detached everything. On the two connectors from inside there was some oxidation that I cleaned, the IPC can line back to work but not the ECM communication with others. 

So I tried swapping the BCM too with another one that programmed but still no comms and IPC didn’t program. 

Today I got the Tigra ECU bought online (ECM BCM IMMO IPC modifyng the connector from pre to facelift, leaving old ABS/TC module) and the car started easily. So I think the problem was the ECM, tomorrow I’ll try and confirm this hypothesis. But the car seems to work with “new” ECUs.

[MIKUr1]

This is common issue with Simtec 71. I told you in second post. Good to know that it's sorted.

[MasterMulder]

This is common issue with Simtec 71. I told you in second post. Good to know that it's sorted.

Now I’m looking for a way to put the ECU the the most distant from the engine block, and create a thermal cover.I do not know if it can prevent damages.

[liviu2004]

Simtec 71.1 don't fail all that often than 71, and they are interchangeable.