Lexus 2012 RX450h Owner's Manual page 140

1-6. Refueling
When the fuel filler door cannot be opened by pressing the inside switch
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RX350
Open the back door and lift the deck board up. (P. 899)
STEP 1
STEP 2
STEP 3
STEP 4
STEP 5
140
With a compact spare tire only:
Remove the spare tire cover.
Remove the auxiliary box.
Pull the lever.
Install the auxiliary box using the clips.