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Opening the Liftgate Without Electrical Power

GM3902961Courtesy of GENERAL MOTORS COMPANY
Callout Component Name
1 Liftgate Latch Release Adapter Hole Plug.
2 Liftgate Latch
Procedure 
Insert a flat bladed service type tool into the square hole and turn it counter clockwise (arrow) until the primary latch releases.
NOTE:

Rotation to release latch should be approximately 30 degrees.Excessive rotation can cause damage to the latch.