Here is a description of the operations and from the symptom description, an error has been detected in the system and appropriate scan tools would be required to perform diagnostics.
The Mechanical Instrument Cluster (MIC) performs a four second bulb check via PCI communication with the Sentry Key Immobilizer Module (SKIM). After the bulb check, the lamp is controlled according to SKIM messages. Then, the SKIM sends messages to the BCM to operate the light based upon the results of the SKIS self tests. The light may be actuated in two possible ways, flashing or on solid. If the light comes on and stays on solid after a power-up test, this indicates that the SKIM has detected a system malfunction. If the SKIM detects an invalid key when the ignition switch is moved to the ON position, it sends a message on the PCI bus to the BCM, to flash the light. The SKIM can also send a message to flash the light and generate a single audible chime at the same time. These two events occurring simultaneously indicate that the SKIS has been placed into the "Customer Learn" mode. Refer to STANDARD PROCEDURE - TRANSPONDER PROGRAMMING for more information on the "Customer Learn" mode. If the light comes on and stays on after the power-up test, diagnosis of the SKIS should be performed using a DRBIII(R) scan tool and the appropriate Body Diagnostic Procedures. The light
is not a serviceable component.
Friday, October 1st, 2010 AT 5:55 PM