Lexus ES300 Owner's Manual page 100

EXTERIOR EQUIPMENT
The trunk lid can be opened using a loop of wire in the trunk
even with the main switch in the glove box turned off. When
keeping items in the trunk, be sure to turn off the main switch
and lock the glove box and rear armrest door. For locking the
glove box, see page 70. For locking the rear armrest door, see
page 99.
In case the opener is not actuated
1. Pull down the rear armrest and open the rear armrest
door.
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2. Pull the loop of wire to unlock the trunk lid.
This is used in case the trunk lid cannot be unlocked due to a
discharged battery or other trouble.