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Check Auxiliary Battery Voltage

Model: Toyota Prius MK 1 - Years 2004-2009
Part: Battery

Regular maintenance of the vehicle ensures a long lifespan. In this case, checking the battery is also very important. Turn on the ignition by pressing the start button. Set the onboard computer to diagnostic mode and navigate through the menu to 'Display Check' and then to 'Vehicle Signal Check'. In this menu, the voltage of the auxiliary battery is displayed, which should be above 12V. By bringing the instrument cluster to pre-ignition, check that the battery voltage under load maintains the value of 12V; if not, it needs to be replaced.

Updated on 5 February 2026 by ScegliAuto

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