Pontiac 2006 Gto - Manual (Page 71)

There is also a secondary trunk release handle located
under the passenger side rear seat head restraint.
To access this handle, lift the head restraint and then
pull the yellow ring. The vehicle must not be moving.
Emergency Trunk Release Handle
Notice: Do not use the emergency trunk release
handle as a tie-down or anchor point when securing
items in the trunk as it could damage the handle.
The emergency trunk release handle is only
intended to aid a person trapped in a latched trunk,
enabling them to open the trunk from the inside.
There is a glow-in-the-dark emergency trunk release
handle located inside the trunk on the trunk lid.
This handle will glow following exposure to light. Pull the
release handle to open the trunk from the inside.
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2006 - Pontiac GTO Owner Manual