1/. Why do heated seats not work? 2/. Why heater fan only operates on #4(hi)?

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1/. Both heated seats not working?, lighted switches not lit up?, fuse 18-20A OK! (ORG - Red power driver/passenger seat modules; and what is the purpose for the diodes shown in a parallel to these red circuits ahead of going to each of the seat modules?), AC fuse5-10A OK! (BRN wire power driver/passenger Lumbar Adjuster/Heater Switches); what is the purpose of the diode 2/. Occurred all of a sudden, randomly works on #'s 1,2,3 but very seldom? Suspect loose connector but where do I locate the resistor pack and wiring connector? 3/. AUX power accessory outlets located under the dash for GPS, Phone charger, etc., do not operate my remote GPS, what is the voltage spec, battery voltage or is it computer controlled? Wiring schematics for power distribution, wiring schematic for ground distribution would be very helpful, diagnostic techniques, and specs greatly appreciated, or any other experiences and solutions, thanks for any assistance,,,, cheers!