PJ bass help

[Tewirimu]

Hi,
I'm Tewirimu from New Zealand. Just a quick hello then a bit of time to explore this site. I live in Papakura, Auckland, New Zealand. Auckland is the largest city and Papakura is a small town close by. I'm ex pro. bass player wanting to find a circuit diagram for my PJ bass. It has a ganged pot for tone which appears to roll off highs as per normal but what does the other chunk of the pot do? Any ideas from anywhere?

 

[J.D.B.]

Look here:http://www.seymourduncan.com/support/wiring-diagrams/
You can also contact them if you don't find it here. Fender can also help here:
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They have quite a list of things covered including wiring diagrams. Welcome to TalkBass, player!
Josh