Transponder Key Coil
WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
Access transponder key coil and disconnect electrical connector from transponder key coil. See Fig 1. Using ohmmeter, check that continuity exists between transponder key coil terminals. See Fig 2. Replace transponder key coil if continuity does not exist. See TRANSPONDER KEY COIL under REMOVAL & INSTALLATION.