Lexus RX 450h 2010 Owner's Manual page 494

Before recharging
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When recharging, the 12-volt battery produces hydrogen gas which is flammable
and explosive. Therefore, observe the following precautions before recharging:
If recharging with the 12-volt battery installed on the vehicle, be sure to discon-
●
nect the ground cable.
Make sure the power switch on the charger is off when connecting and discon-
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necting the charger cables to the 12-volt battery.
After recharging/reconnecting the 12-volt battery
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The hybrid system may not start. Follow one or both of the following procedures:
After opening and closing the driver' s door, wait 10 seconds and then attempt to
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start the hybrid system. (If the system does not start the first time, repeat the pro-
cedure.)
With the shift lever in P and the "POWER" switch off, open and close any door
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and then attempt to start the hybrid system.
If the system will not start even after multiple attempts at both methods, contact
your Lexus dealer.
4-3. Do-it-yourself maintenance
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