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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Mechanical Maintenance and TSBs: Break-in / Oil & Fluids / Servicing / TSBs and Service Bulletin > No communication with 4 ECU (ihka , con ,smfa , trsvc)
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      05-21-2019, 08:48 PM   #1
F30RiK
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Drives: 13' 335 xdrive M-sport 6 Speed
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No communication with 4 ECU (ihka , con ,smfa , trsvc)

It started this morning, back up camera stopped working and car threw some airbag faults.

Now the only thing that doesn't work is the reverse camera.

Someone ever had this problem before ?

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      05-22-2019, 06:34 PM   #2
F30RiK
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ok, so I found the problem, trsvc module (reverse camera) was making a short on the K-cAn line. That's why I had so many random errors (airbags, tires pressures) randomly.

I diagnosed the problem by disconnecting each module one at the time and doing a vehicule scan with ista+ each time. As soon as I disconnected the trsvc module, the 3 others module that weren't communicating started to communicate and all the faults cleared (except for the reverse camera).

Now I have to find a trsvc module, I left it disconnected for now (don't care much about the back up camera lol).
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