16 pin to ISO. Dimensions of the plug approx 24 x 10 mm.

For the following Pioneer car radios:

DEH-P 77 MP / 359 / 845 MP / 1500 / 1530 / 1590 / 1600 R / 1630 R / 2500 / 2530 / 3500 MP / 3530 MP
3590 MP / 3600 MP / 3630 MP / 3700 MP / 4500 MP / 4530 MP / 5500 MP / 5600 MP / 5530 MP / 6500 MP
6530 MP / 7550 MP / 7600 MP / 7700 MP / 8600 MP