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To update the radio in newer models of Jeep Grand Cherokee, start by turning the ignition on without starting the engine. Next, press the gas pedal three times within ten seconds. Turn off the power to the vehicle, wait for ten seconds, then start the vehicle again. If the radio still isn't working, check for a blown fuse.
To change the radio settings on a 2019 Jeep Grand Cherokee, first turn the ignition switch to the on position. Next, press the gas pedal three times quickly within 10 seconds. After that, turn off the ignition and wait for about ten seconds before starting the engine again.