2015 GMC SIERRA change time

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GMC SIERRA 2015  Get To Know Guide 5
A. Seat Cushion Adjustment
 Move the front horizontal control to move the seat forward or rearward, or to tilt, raise or lower the seat.
B. Seatback Adjustment
 Move the vertical control to recline

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GMC SIERRA 2015  Get To Know Guide 13
gmc IntellIlIn K raDIo w It H 8-Inc H* color screenF
Setting the Time
1. Touch Settings on the home page.
2. Touch Time and Date.
3. Touch Set Time.
4. Touch the arrows to adjust the hours, minutes

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GMC SIERRA 2015  Get To Know Guide 20
The myGMC mobile app connects owners to a variety of vehicle  
info rmation and services, such as a searchable Owner Manual, real-time  fuel information and Roadside Assistance. 
OnStar RemoteLink