4Runner Owners: If you have an 8″ subwoofer on the passenger side of your trunk space, then you have a JBL amplified system. If you do not have an 8″ subwoofer on the passenger side of your trunk space, then you do not have a JBL amplified system.
Tacoma Owners: If your door speakers have a JBL logo on them, then you have a JBL amplified system. If your door speakers do not have a JBL logo, then you do not have a JBL amplified system.
Tundra Owners: If your door speakers have a JBL logo on them, then you have a JBL amplified system. If your door speakers do not have a JBL logo, then you do not have a JBL amplified system.