Handbook 652 Body Electrical Diagnosis Relays There are numerous types of relays used in Toyota vehicles. Some may be conventional mechanical relays and some may be solid state relays. • Mechanical relays are always shown with the coil de-energized Also, some relays may be replaceable, and some may be integrated into a relay block or junction block and non serviceable. If an integrated relay fails, the entire relay block or junction block must be replaced. Technical Training 63