You want the retained accessory power (RAP) circuit. Easiest to tap into is probably terminal B, yellow wire at the rear window wiper/washer switch, just behind the center trim panel under the radio.
Guess I should ask where you have it mounted. If at the rear of the vehicle. there is a wiring harness that runs down the driver's side, and there is another RAP wire going to the rear washer pump; same color...yellow.
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