JTAG/UART/SPI/Diagnostic I/O used in Sony repair centers if a PSVita couldn't be fixed by software.

Pictures

<imgur>cWujmwt.png</imgur> <imgur w="250">KUCQvJF.jpg</imgur>

Pinout

Pin	Name	Description	Notes
1	GND
2		Connected to JL Pin (Bottom left 1st)
3	GND
4		Connected to JL Pin (Top left 1st)
5	GND
6	Ernie RX	Connected to JL Pin (Bottom left 2nd)	Important for Jigkick
7	Ernie TX	Connected to JL Pin (Top left 2nd)	Important for Jigkick
8	Kermit CTS	Connected to JL Pin (Top left 3rd)	Important for Jigkick
9	GND
10	GND
11		Connected to CL Pin (Leftmost 1st)
12		Connected to CL Pin (Leftmost 2nd)
13	Kermit RX	Connected to JL Pin (Bottom left 3rd)
14	Kermit TX	Connected to JL Pin (Bottom left 4th)
15	GND
16	GND
17		Connected to CL Pin (Leftmost 3rd bottom)
18		Connected to CL Pin (Leftmost 4th top)
19	Ernie CTS	Connected to JL Pin (Top left 4th)	Important for Jigkick
20	Jig Sense Probe	Connected to JL Pin (Bottom left 5th)	Important for Jigkick
21	GND
22	GND
23	VDD
24	VDD