Triple-check that you have +12V on pins 17 & 18, Ground on pins pins 36 & 54, and ~+7V on pin 15. Do this with the TCU removed and triple-check that you have the pins identified correctly. If the TCU has +12V, ground, and I-Bus, then the Telephone option will appear on your nav menu or MID.

In my experience helping people with TCU/ULF retrofits, mot of the problems are due to a wiring fault in the adapter harness, and only a few are a bad component. So, assume that your wiring is bad and work from there. If you do the triple-check and still get no results, then maybe you have a bad TCU.

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