1998 to NOW.
ACTUATOR TEST pg. 1790
The instrument cluster actuator test will put the instrument cluster into its self-diagnostic mode. 

In this mode the
instrument cluster can perform a self-diagnostic test that will confirm that the instrument cluster circuitry, the
gauges and the indicators are capable of operating as designed. During the actuator test the instrument cluster
circuitry will position each of the gauge needles at various calibration points, illuminate each of the segments in
the Vacuum-Fluorescent Display (VFD) units, and turn all of the indicators ON and OFF again.
Successful completion of the actuator test will confirm that the instrument cluster is operational. However, there
may still be a problem with the CAN or LIN data bus, the Powertrain Control Module (PCM), the Totally
Integrated Power Module (TIPM), the Controller Antilock Brake (CAB), the All-Wheel Drive Control Module
(AWDCM), the Occupant Restraint Controller (ORC), the compass module, the Sentry Key REmote Entry
Module (SKREEM) (also known as the Wireless Control Module/WCM), or the inputs to one of these
electronic control modules. Use a diagnostic scan tool to diagnose these components. Refer to the appropriate
diagnostic information.
1. Begin the test with the ignition switch in the OFF position.
2. Depress the odometer/trip odometer switch button.
3. While still holding the odometer/trip odometer switch button depressed, turn the ignition switch to the
ON position, but do not start the engine.
4. Release the odometer/trip odometer switch button.
5. The instrument cluster will simultaneously begin to illuminate all of the operational segments in the VFD
units, and perform a bulb check of each operational LED indicator. The VFD segments and LED
indicators remain illuminated as each gauge needle is swept to several calibration points and back. If a
VFD segment or an LED indicator fails to illuminate, or if a gauge needle fails to sweep through the
calibration points and back during this test, the instrument cluster must be replaced.
6. The actuator test is now completed. The instrument cluster will automatically exit the self-diagnostic
mode and return to normal operation at the completion of the test. The actuator test will be aborted if the
ignition switch is turned to the OFF position, or if an electronic vehicle speed message indicating that the
vehicle is moving is received over the CAN data bus during the test.
7. Go back to step 1 to repeat the test, if necessary.