Actions to Be Taken When Batteries Are Depleted

Actions to Be Taken When Batteries Are Depleted

HINT: The LEXUS RX400h uses a 12 V auxiliary and a 288 V hybrid vehicle battery. Therefore, there are two recharging methods when the batteries are depleted.

a. Perform this procedure when the auxiliary battery is fully depleted.

HINT: The following problems indicate that the auxiliary battery is depleted:
- No display appears on the instrument panel when the ignition switch is set to ON.
- The hybrid system does not start.
- The headlights are dim.
- The sound from the horn is weak.

CAUTION: Never use a quick charger.

1. Move the shift lever to the P position and engage the parking brake.
2. Remove the key from the ignition switch
3. Remove the 2 clips and engine room cover side.










4. Using a booster cable, connect the 12 V battery of the rescue vehicle and the auxiliary battery of the stalled vehicle, as shown in the illustration.




5. Start the engine of the rescue vehicle and run the engine at a speed slightly higher than usual.




6. Put the vehicle into the READY-on state to start the hybrid system.

NOTE: Immediately disconnect the booster cable in the reverse order of connection after the hybrid system and the engine have started. Do not leave the booster cable connected because it is not designed for recharging purposes. If the hybrid system fails to start and the HV warning light turns ON, the HV battery may be depleted.

b. When the hybrid vehicle battery is depleted:
Replace the hybrid vehicle battery.

HINT: When the hybrid vehicle battery is depleted, the HYBRID VEHICLE BATTERY WARNING illuminates, and DTC P3000-389 is stored in the hybrid ECU.