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If there is no power at the horn or foglight, then I'm NOT right, I suspected a pair of bad horns (not uncommon) and corroded foglight connector(also very common). The amber bulb is a fairly common bad bulb, but you had said you replaced the bulb, so no good idea there other than what you've already done. You need a wiring schematic.
On the seat backrest, you can tilt the backrest all the way forward and there are 2 screws at the base of the backrest rear cover, remove those and the cover will be able to come off easily, then you can check for power at the headrest raise/lower motor. Are you able to pull the headrest assembly up, or does it seem attached to the raise/lower mechanism?
Gilly
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