When an instrument cluster is replaced, the Fuel Calibration Part Number is to be entered using the Tech 2. This identifies the fuel tank size and fuel sender unit resistance to the instrument cluster. The Fuel Calibration Part Number is identified by the Code Index Number, which is associated with a particular vehicle configuration. The Code Version Number identifies the software version. Only the Code Index Number can be changed.

1. From the Programing Menu select Fuel Gauge Calibration and press the Enter key.
2. The Code Index Number and the Code Version Number are displayed. To change the Code Index Number, press the Modify soft key. To exit without making a change, press the Okay soft key.
3. Use the Up and Down arrow keys to highlight a vehicle type and press the Enter key.
4. Follow the Tech 2 screen prompts to complete the programming.
5. Enter the instrument cluster Diagnostic Mode. Press the trip computer switch MODE button until the Fuel Calibration Part Number is displayed on the multifunction display (MFD). Verify that the Fuel Calibration Part Number displayed is correct.

1. From the Programing Menu select Instrument Configuration and press the Enter key.
2. The Configuration Menu will be displayed showing the current vehicle configuration.
3. To modify any item, select the item using the Up and Down arrows and press the Modify soft key or the Enter key. The appropriate screen will be displayed.

The vehicle odometer is calculated and stored electronically in the instrument cluster. It is only possible to program the odometer reading on an instrument cluster once the TIS approval (Enable Programming) has been obtained and on an instrument cluster which is new.

1. From the Program Menu select Odometer Reset and press the Enter key.
2. Press the Abort soft key to abandon the process, or press the Modify soft key to continue.
3. Use the Left and Right arrow keys to scroll across the number displayed on the Tech 2 screen and modify using the numeral keys.
4. Press the Enter key to continue.

Important: This is the last chance to get the odometer value correct. Ensure that the value is correct before proceeding.

5. Check that the odometer value displayed on the Tech 2 screen is correct. If the value is incorrect, press the Not Okay soft key to return to the previous screen and enter the correct value. If the value is correct, press the Okay soft key to continue programming.
6. Press the Confirm soft key when notified that the programming has been completed successfully.
7. Turn the ignition off and on again to accept the programming changes.

To enter the instrument cluster Diagnostic Mode, press the trip computer switch MODE and SET buttons simultaneously while turning the ignition on. Further pressing the MODE button for less than 2 seconds will step through the various instrument cluster information displays, which appear on the MFD. The vehicle may be driven while in Diagnostic Mode. As the instrument cluster can be set to display either English (miles per hour) or Metric (kilometers per hour), the screens displayed in Diagnostic Mode will depend on that selection. To exit the instrument cluster Diagnostic Mode press the trip computer switch SET button for less than 2 seconds, or switch the ignition off. In sequence, the instrument cluster Diagnostic Mode screens are:

Software Version

This screen provides details of the instrument cluster software version. Press the MODE button to continue.

GM Part Number

This screen provides details of the instrument cluster part number. Press the MODE button to continue.

Trip Computer Switch Voltage

This screen provides an indication of the operational status of the trip computer switch. When checking the MODE button voltage, press and hold the button for more than 2 seconds otherwise the Diagnostic Mode will advance to the Battery Voltage screen. When checking the SET button voltage, press and hold the button for more than 2 seconds otherwise the system will exit the Diagnostic Mode. Press each button and the following nominal voltages should be indicated:

Press the MODE button to continue.

Battery Voltage

This screen provides an indication of the current battery voltage. Press the MODE button to continue.

Fuel Calibration Part Number

When an instrument cluster is replaced, the fuel calibration part number is to be entered using Tech 2. This identifies the fuel tank size and fuel sender unit resistance to the instrument cluster. Press the MODE button to continue.

Remaining Fuel

This screen provides an estimate of the fuel remaining in the fuel tank to the nearest gallon (5 liters). Remaining fuel can also be displayed in gallons. Press the MODE button to continue.

Instantaneous Fuel

This screen provides details of the instantaneous fuel usage. Instantaneous fuel can also be displayed in gallons per hour . Press the MODE button to continue.

Coolant Temperature

This screen provides an indication of the current coolant temperature in degrees Celsius. The current coolant temperature can also be displayed in degrees Fahrenheit. Press the MODE button to continue.

Speed

This screen provides an indication of the current vehicle speed in kilometers per hour. The current vehicle speed can also be displayed in miles per hour. Press the MODE button to continue.

Tacho

This screen provides an indication of the current engine speed in RPM. Press the MODE button to continue.

Park Lamps On/Off

The park lamps circuit provides illumination for the instrument cluster. If the parks lamps are shown as ON, the instrument cluster should also be illuminated. Press the MODE button to continue.

Daytime Running Lamps

The daytime running lamps circuit provides illumination of the low beam headlamps when the following conditions are satisfied: PRNDL not in Park (Automatic transmission only). Park brake is released. Vehicle speed exceeds 11 km/h (7 MPH) Park lamps are off. Press the MODE button to continue.

Trouble Codes

The Trouble Codes screen displays 2 rows of 16 digits each. If no DTC is set the 32 digits are all zeros (0). However, if a DTC is set, this is represented by a one (1) in the appropriate position in the rows. The following table shows the location of each DTC identifying digit. To determine the actual DTC number that has been set, count the digits from the bottom right hand side, starting at zero.

Press the MODE button to continue.

Full Test

The Diagnostic Mode also has a self-test function (Full Test) to verify correct instrument cluster operation. When activated, the following occurs:

Faults can be identified by using Tech 2 to test instruments and force values and conditions into the instrument cluster. The results of these tests can be used to diagnose problems in the instrument cluster such as faulty gages and switches. Faults within other components can be identified after using Tech 2 to confirm correct operation of the instruments. For example, if there was a reported fault with the speedometer gage and Tech 2 diagnosed the gage as working correctly, then the fault would lie in the powertrain control module (PCM) or in the harness from the speed sensor to the PCM, both of which would then require further testing.