The Toyota Tundra JBL has has an amplifier as part of its CrewMax stock Audio stereo system. If Your amp has gone bad, You can expect to pay between $99 and $350 for a new one. You can purchase it by ordering from an automotive parts and accessories retail location, or online from Audio parts sellers You trust. Here is a diagram of the amplifier system, per Your request. Https://tnstatic.net/attachments/tundra-amp2-jpg.239174/
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