Toyota 2004 Matrix Owner's Manual page 84

Anchor brackets
Symbol
Use the anchor brackets in the luggage
compartment to attach the top strap.
Anchor brackets are installed for each
rear seating position.
This symbol indicates the location of the
anchor bracket.
66
'04 MATRIX_U (L/O 0307)
TO USE THE ANCHOR BRACKET:
1. Outside anchor brackets only—
Remove the head restraint.
2. Open the lid of the anchor bracket.
2004 MATRIX from Oct. '03 Prod. (OM12861U)