Lexus RX 450h Owner's Manual page 554

552 7-2. Steps to take in an emergency
Restarting the hybrid system
If you have a set of jumper (or booster)
cables and a second vehicle with a
12-volt battery, you can jump start your
vehicle by following the steps below.
1 Confirm that the electronic key is
being carried.
When connecting the jumper (or booster)
cables, depending on the situation, the
alarm may activate and doors locked.
(P.126)
2 Open the hood (P.467) and fuse
box cover.
Connect a positive jumper cable clamp to
5
clamp on the other end of the positive cable to
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3 Open the exclusive jump starting
terminal cover.
4 Remove the engine cover.
on your vehicle and connect the
A
on the second vehicle. Then,
B