To reset a Kenwood 8070 receiver without a remote, you typically need to locate the reset button on the device itself. This button is often small and recessed, so you may need a paperclip or a similar tool to press it. Consult the user manual or look for the reset button near the power or input/output ports on the receiver. Once located, press and hold the reset button for a few seconds until you see the receiver reset. Keep in mind that this process may vary slightly depending on the specific model of the Kenwood 8070 receiver.
Take a look at this manual diagram. https://www.manualslib.com/manual/359815/Kenwood-Ksc-Sw10.html?page=5#manual
Given the above is not your model, at least it shows the 10 pin. Ironically, below I offer a diagram of your model. The irony comes in the fact that the diagram appears labeled in Japanese But if you compare the two diagrams, maybe something will make sense from the one with the English labels. Otherwise, you might fire off a query to Kenwood customer support. https://www.manualscenter.com/manuals/kenwood/kscsw900-owner-manual.html
Here is a 10 pin harness compatible with the subwoofer. Kenwood Subwoofer Amp KSC Wa100 Wa80 Sw10 10 Pin Harness for sale online ' eBay
I don't have any information on how to power supply a kCSWA900 Kenwood subwoofer. However, I can tell you that the Kenwood KSC-SW10 compact powered subwoofer has a built-in amplifier with a 38 watts RMS power and a wired remote for control over volume level, variable low-pass crossover (50-120 Hz), and selectable phase control (0°, 180°) . The subwoofer comes with a power/ground wiring harness and preamp (RCA) and speaker-level inputs .
The Kenwood KAC-7252 and KAC-9104D are both great amps, but they have different strengths and weaknesses. The KAC-7252 is a 5-channel amp that can output 75 watts per channel at 4 ohms. It also has a built-in crossover and time alignment, which can be helpful for getting the most out of your woofers. The KAC-9104D is a 4-channel amp that can output 100 watts per channel at 4 ohms. It also has a built-in subwoofer output, which can be used to power a separate subwoofer.
If you are looking for an amp that can power all of your speakers, the KAC-7252 is a great option. It is also a good choice if you want an amp with built-in crossover and time alignment. However, if you are looking for an amp that can power a subwoofer, the KAC-9104D is a better choice. It is also a good choice if you want an amp with more power output.
Ultimately, the best amp for you will depend on your specific needs and budget. If you are not sure which amp is right for you, it is always a good idea to consult with a professional car audio installer.
Here is a more detailed comparison of the two amps:
Kenwood KAC-7252
Question edited for a lot more clarity.
It is electronically defective and needs to go to a Kenwood Service Centre. you can't fix it unless you go go on the 2 year electronic technicians course.
https://www.google.com/search?q=Kenwood+KAC-819+cycles+on+and+off
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There are only 3 ways to get a radio code. In your case you need to contact Kenwood direct and tell them the serial number of the unit. If you bought it secondhand, it might have 'history'.
https://www.fixya.com/support/r29874205-need_vehicle_radio_code
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