According to our previous paragraphs, voltage abnormality in Toyota RAV4 is a condition where the battery voltage is below or above the normal range of 11 to 14 volts. The leading causes of voltage abnormality are low battery positive voltage and parasitic battery drain. To diagnose low battery positive voltage, inspect the fuse, the battery condition, and the wiring harness between the fuse and the skid control ecu. To diagnose parasitic battery drain, you need to measure the current drawn from the battery using an ammeter or a multimeter and identify which circuit is causing it by removing fuses one by one. You must repair or replace the faulty components affecting the battery voltage to solve voltage abnormality.