Toyota Prius: Auxiliary Battery
When Auxiliary Battery Is Discharged
WHEN AUXILIARY BATTERY IS DISCHARGED
WHEN AUXILIARY BATTERY IS DISCHARGED
NOTICE:
Never use a quick charger.
HINT:
-
The following problems indicate that the auxiliary battery is discharged:
- No display appears on the instrument panel when the ignition switch is turned to ON.
- The hybrid system does not start.
- The headlights are dim.
- The sound from the horn is weak.
- The booster terminal cannot be used to rescue a Toyota Prius vehicle with a discharged auxiliary battery.
(a) Set the shift position to P (park) and engage the parking brake.
(b) Make sure to carry the electrical key and check that the ignition switch is off.
(c) Remove the No. 1 relay block cover.
(d) Open the booster terminal cover.
| Remove in this Direction |
(e) Using booster cables, connect the 12 V auxiliary battery of the rescue Toyota Prius vehicle to the auxiliary battery of the stalled vehicle as shown in the illustration.
| *a | Booster Terminal | *b | Auxiliary Battery of Rescue Toyota Prius Vehicle |
| Connecting Sequence | Connecting Location |
|---|---|
| 1 | Booster terminal of stalled Toyota Prius vehicle |
| 2 | Positive ( ) auxiliary battery terminal of rescue vehicle |
| 3 | Negative (-) auxiliary battery terminal of rescue Toyota Prius vehicle |
| 4 | Position shown in the illustration on stalled vehicle |
(f) Start the engine of the rescue vehicle and run its engine a slightly elevated speed for approximately 5 minutes in order to charge the auxiliary battery of the stalled Toyota Prius vehicle.
(g) With the ignition switch off, open and close any door.
(h) With the engine of the rescue vehicle being run at a slightly elevated speed, turn the ignition switch to ON (READY) from ON to start the hybrid system. [*1]
NOTICE:
Immediately disconnect the booster cables in the reverse order of connection after the hybrid system has started.
HINT:
- If the hybrid system does not start even after the auxiliary battery returns to normal, ensure the shift position is P (park) and repeat the procedure from [*1].
-
When the auxiliary battery is fully depleted, the automatic learning function completes learning when each system is first used.
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Toyota Prius (XW60) 2023-2025 Service Manual
Actual pages
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