Switch on ignition. Cycle left steering wheel buttons till mileage and trip are displayed. Press reset button ( left corner of instrument cluster ) for 3 seconds until reset message appears, release and press again within a few seconds and confirmation will appear on dash. switch off ignition. and still not working

Odometer
The IPC contains a season odometer and a trip odometer. Momentarily press the trip/reset switch on the IPC in order to toggle between the season odometer and the trip odometer. Press the trip/reset switch for greater than 2 seconds, while the trip odometer is displayed, in order to reset the trip odometer. The IPC displays the vehicle mileage and trip mileage as determined by the BCM. The BCM calculates the mileage based on the vehicle speed signal circuit from the PCM. The odometer will display 'error' if an internal IPC memory failure is detected or there is a loss of class 2 communication.

IPC - instrument panel cluster.

Replace the instrument panel cluster (IPC). Refer to Instrument Cluster Replacement .

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The IPC calculates the mileage based on the vehicle speed signal circuit from the engine control module (ECM). The odometer will display 'error' if an internal IPC memory failure is detected. The odometer displays either miles or kilometers as requested by the activation of the Personalization button on the steering wheel controls. IPC - instrument panel cluster .
Schematic Reference: Instrument Cluster Schematics

1

Did you perform the Instrument Cluster Diagnostic System Check?
Go to Step 2
Go to Diagnostic System Check - Instrument Cluster

2

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Turn the ignition ON.

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Activate the trip reset button.

Does the odometer display switch between trip and odometer?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
Go to Step 3

3

Important: Program the replacement instrument panel cluster (IPC).
Replace the IPC. Refer to Instrument Cluster Replacement .
Did you complete the replacement?
Go to Step 4
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4

Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 2
Install a scan tool.
Does the scan tool power up?
Go to Step 2
Go to Scan Tool Does Not Power Up in Data Link Communications

2

1. Turn the ignition ON, with the engine OFF.
2. Attempt to establish communication with the following control modules:

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Body Control Module (BCM)

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Driver Door Module (DDM)

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Electronic Brake Traction Control Module (EBTCM)

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Inflatable Restraint Diagnostic Module (SDM)

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Instrument Panel Cluster (IPC)

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Liftgate Module (LGM)

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Passenger Door Module (PDM)

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Powertrain Control Module (PCM)

Does the scan tool communicate with the control modules listed above?
Go to Step 3
Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications

First make sure all of the doors, hood, trunk, etc are closed.
Turn the key to position 1
Press system select button(lower left buttons on the steering wheel) that looks like sheets of paper until you see mileage reading or temperature displayed.

Press the brightness button on the lower left instrument cluster 3 times. You should hear a signal and see voltage on the display.

Turn the key to position 2

Press the lower scroll forward/back button(steering left arrows)). You should see "service indicator" on the screen

Press the Brightness button again once. You should see oil type on the screen.

Select the oil grade you used by pressing the + & - buttons on the upper right on the steering wheel.

Press the scroll forward/backward button to confirm. Confirm oil reset, press R(brightness button on lower left on cluster) for 3 seconds should appear on the display.

Service confirmed should appear on the display.

Press the upper forward/backward button & "service indicator" appears on the display.

Press the upper system select button(lower left steering wheel button on left) The display should go back to basic mileage or temperature.

If all else fails. I believe the shortcut I took as a tech was, turn the key to the first position, scroll until you see the temperature or mileage displayed. Turn the key off, push in the brightness button and HOLD it while turning the key to the 2nd position. You should see something like do you want to reset service? press R(brightness) button for 3 seconds and it should reset.

Good luck. The newer cars are worse.

This is right from GMC service repair manual
Odometer
The vehicle odometer is calculated and stored electronically in the instrument panel cluster (IPC). The base IPC contains a season odometer and a trip odometer. The uplevel IPC contains a season odometer and two trip odometers. Momentarily press the trip/reset switch on the IPC in order to toggle between the season odometer and the trip odometer. Press the trip/reset switch for greater than 2 seconds, while the trip odometer is displayed, in order to reset the trip odometer.
The IPC calculates the mileage based on the vehicle speed signal circuit from the engine control module (ECM). The odometer will display 'error' if an internal IPC memory failure is detected. The odometer displays either miles or kilometers as requested by the activation of the Personalization button on the steering wheel controls.

Hi, The sequence can be one of two depending on the software of your instrument cluster. The first - ignition on, use the arrow buttons on your steering wheel to bring the service icon up, press and hold the 'r' button (Left hand side of instrument cluster, small round black button) for 5 seconds, an audible beep will sound and the display will say service confirmed. The second is - ignition key to position 1, press the 'r' button 3 times in quick sucsession. a menu will appear, then turn the key to position 2 and using the up and down arrows scroll through till the service display is up. Then press the r button once, you will be asked if you want to reset. Confirm using 'r' button.

Switch on ignition. Cycle left steering wheel buttons till mileage and trip are displayed. Press reset button ( left corner of instrument cluster ) for 3 seconds until reset message appears, release and press again within a few seconds and confirmation will appear on dash. switch off ignition.

switch on ignition wait some time till mileage appear on display then press and hold R button on you instrument cluster till make beep sound as soon as make beep sound release R button and read what display say you to do next ( will ask for confirm resting press R button again for 3 second) then say reset confirmed after that switch ignition and switch on and read new service.

If you mean the service light here is the procedure.
Button #1 mileage reset button
Button #2 Clock adjustment button

• Switch ignition off
• Press and hold button #1 at bottom left of speedometer
• Switch ignition on and release button
• The text "service Oil or service INSP" will appear in the display window. On 2000 m, y, cars the message "SERVICE NOW" will appear in the instrument cluster with center display
• Turn button # 2 at lower side of tachometer to the right
• The service display shown in the display window is now reset and "service _ _ _" will appear in the display window
• Switch ignition off, service display is now set until next scheduled service interval is reached.
  

1.- Insert key into ignition, switch to position "1"
2.- Press the menu buttons repeatly until the mileage is displayed within the multifunction display.
3.- Press the cluster illumination button (trip reset button) 3 times in short succession. The battery voltage will be displayed and an audible signal will sound.
4.- Turn key in ignition to position "2"
5.- Press the Up and Down Arrow buttons until service menu appears.
6.- Press cluster illumination button (trip reset button) once. The oil type menu is displayed.
7.- Use the + and - buttons to select the oil used for service.
8.- Press the Up and Down buttons to confirm. The display will show : "Reset Oil Confirmation. Push Illumination button for 3 seconds".
9.- Press and hold the cluster illimination button for 3 seconds. The message "Service confirmed" is displayed.