check your 12v Auxiliary Battery self test (Toyota Prius). the process to check your 2004-2009 Toyota Prius 12V aux battery
step 1 - Turn on standby power (press power button)
step 2 - Hold the display button
step 3 - While holding display button turn lights on quickly 3 times.
Step 4 - Let go of display button
After these steps as shown in the video the car will enter the self diagnostic mode.
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