Lexus LS 600h L 2012 Owner's Manual page 456

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Installing the 12-volt battery cover
Before recharging
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When recharging, the 12-volt battery produces hydrogen gas which is flammable
and explosive. Therefore, observe the following before recharging:
If recharging with the 12-volt battery installed on the vehicle, be sure to discon-
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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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In some cases, 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 then attempt to
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start the hybrid system. (If the system does not start first time, repeat the proce-
dure.)
With the shift lever in "P" and the "POWER" switch OFF, open and close any
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door, 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
Install the 12-volt battery cover
with the clip. Press down on the
cover at position "A" to secure it.
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