Yes, I saw the 5-pin on the schematic diagram,
with the Tone-Burst (1750 Hz) option using the NE555 IC.The first 3 pin assignments on the connector match the TU-4c, IF correctly installed.
A DVM or VOM can quickly confirm.
The Kenwood TU-4c, according to schematic, uses the MX315 IChttp://www.datasheetcatalog.org/datasheets2/17/179186_1.pdf
LOOKING at the TU-4c schematic, you see that PIN 14 of the MX315 receives VDC for power.
The power is on 2 pins ... One for VHF, the other for UHF DIP switches.The 2 other lines are for E (Earth, Ground) from pin 7 and T (CTCSS tone output) from pin 11http://elektrotanya.com/kenwood_tu4a_tu-4b_tu-4c_sch.pdf/download.html
The YouTube video clearly shows a 4-pin connector ...
so different regional models may exist ... OR production change.