You will find the H - Hour and M - Minute buttons under the tuner button. Press and hold the buttons individually until you hear a beep and watch the time change until you get to the hour and or minute you need. Simply let go and it is set.
How to change the spark plugs
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apparently you don't have one. gm stopped including them after 2003
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The jack is under the back seats of the envoy.
Remove speaker grill covers on dash to expose tweeters then remove door panels and you will se the rest of speakers
25gal