Actions to Be Taken When Batteries Are Depleted

ACTIONS TO BE TAKEN WHEN 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 power switch is ON (IG).
- The hybrid system does not start.
- The headlights are dim.
- The sound from the horn is weak.

NOTE: 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 vehicle.




3. Using a booster cable, connect the rescue vehicle's 12 V battery positive (+) lead to the stalled vehicle's relay block positive (+) terminal and the negative (-) lead to the suspension support's nut on the right side.
4. Start the engine of the rescue vehicle and run the engine at a speed slightly higher than the idling speed for 5 minutes to charge the auxiliary battery of the stalled vehicle.




5. Depress the brake pedal and push the power switch to start the hybrid system. If the hybrid system fails to start, the master warning light flashes, and the multi-information display is as shown in the illustration, the HV battery may be depleted.
6. Disconnect the booster cable in the reverse order of the connection procedure.

NOTE: If the auxiliary battery needs to be replaced, replace it only with a 12 V battery specially designed for use with the LEXUS GS450h.




b. When the HV battery is depleted, replace the HV battery.

HINT: If the HV battery is depleted, the master warning light flashes, and the multi-information display is as shown in the illustration, and DTC P3000-388, 389 or 603 code is output.