lift glass not locking on 2007 GMC Envoy

When I lock my vehicle with the keyless remote every door locks but the rear lift glass is not locking. I have checked the fuses and have looking inside the latch to see if the wiring is plugged in which it was. Have no clue what to check now

1 answer
Sounds like lock actuator probs. Will need to remove cover(s) and inspect carefully to see if does have power and grounds.