[boweld11]

Hello gentlemen,

I've been struggling with my f07 gt5 for a week now. I fiddled with the TCU, i.e. I disconnected the modules and after reconnecting the CIC shows no signs of life. Black screen. Ista shows no communication with the phone, mulf, kombi, CIC. Strangely enough, the clocks work and the only green controller on the MOST is the amplifier. I checked the fuses - they are ok. There is power to the CIC. There is ground on the TCU, no 12v on the 17th pin, but there is on the 15th pin (tel crush). I am attaching errors from ista and the driver tree.

[LeonidLunin]

Check most, it should be cycled

[boweld11]

Check most, it should be cycled

Shouldn't the MOST be OK if the amplifier works?

I ordered Most loops. I just unhooked the MOST at the TCU and I will attach it there.

[lalle]

If you disconnect Tcu, does anything changes in CIC-status?

[boweld11]

If you disconnect Tcu, does anything changes in CIC-status?

Nothing changes.  Is it possible that the CIC itself has been damaged?

[Powerlab]

If you want to check only CIC, you should loop only CIC and check if it is working condition. I mean most in / most out all goes to CIC. Check it if it working there is a most cable crack or faulty most module. Combox or mulf, kombi etc

[bellphegorus]

it schould work with diagnose, without most, over Can, did you check what your CAN Messaging says? Osciloscope ? it can be that your Can Bus is distorted.

[boweld11]

I haven't checked CAN yet.  Today I will have a second CIC unit to replace.  I will also put a loop on the MOST at the TCU.

I don't have a combox unit on board.  I have a TCU that does not have CAN.

Gentlemen, thank you all for your help.  problem solved - the loop on tcu and cic works.  tcu needs to be replaced