Mercedes-Benz GLA Series Operator's Manual page 265

Loosen screws 2 and remove the fuse box
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lid from the top.
Closing
Place the lid on the fuse box.
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Tighten screws 2.
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Fold back the carpet.
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Opening and closing the fuse box in the
cargo compartment
Observe the notes on electrical fuses
( page 260).
/
Open the cargo compartment floor .
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Fuse box 1 is located underneath the cargo
compartment floor.
Breakdown assistance 263