Cruise On Indicator Not Operating Properly

Possible Causes are:

Turn ignition on. Using the DRBIII(R), read engine DTC's. Are there any PCM DTC's present? If yes, diagnose and repair Speed Control System problems. See SELF-DIAGNOSTICS - GRAND CHEROKEE article in ENGINE PERFORMANCE. Perform BODY VERIFICATION TEST VER 1 under VERIFICATION TESTS. If no, go to next step.
Ensure there is communication with the Instrument Cluster, PCM and the ABS modules before proceeding with this test. Perform the Instrument Cluster Self Test. The self test can be performed with the DRBIII(R) or manually using the following procedure: Turn ignition off. Press and hold the Trip Reset button. Turn ignition on. The Cruise indicator in the PRNDL should illuminate for approximately 5 seconds during the self test. Did the Cruise indicator illuminate for approximately 3 to 6 seconds? If yes, test is complete. If no, replace the instrument cluster. Perform BODY VERIFICATION TEST VER 1 under VERIFICATION TESTS.