Wrangler 4WD L4-150 2.5L VIN P MFI (1998)
Security Lamp/Indicator: Description and Operation
SYSTEM OPERATION
The Smart Key Immobilizer System (SKIS) indicator lamp gives an indication when the SKIS is faulty or when the vehicle has been immobilized
due to the use of an invalid ignition key The lamp is controlled by the instrument cluster circuitry based upon messages received from the Smart
Key Immobilizer Module (SKIM) on the Chrysler Collision Detection (CCD) data bus.
The SKIM sends a message to the instrument cluster circuitry to turn the lamp on for about three seconds when the ignition switch is turned to the
On position as a bulb test. One second after completion of the bulb test, the SKIM sends a message to the instrument cluster circuitry to turn the
lamp on or off based upon the results of the system self-tests. If the SKIS lamp comes on and stays on after the bulb test, it indicates that the SKIM
has detected a system malfunction and/or that the SKIS is inoperative.
If the SKIS indicator lamp is flashing, it indicates that the SKIS has immobilized the vehicle because an invalid key has been detected in the
ignition switch. The SKIM can also send a message to the instrument cluster to flash the lamp and to generate a single audible chime tone. These
functions serve as an indication to the customer that the SKIS has been placed in its "Customer Learn" programming mode. Refer to Accessories
and Optional Equipment/Antitheft and Alarm Systems for more information on the SKIS system.
The SKIS indicator lamp uses a replaceable incandescent bulb and bulb holder on the instrument cluster electronic circuit board. Refer to
Instrument Panel, Gauges and Warning Indicators/Instrument Panel Systems for diagnosis and service of a faulty SKIS indicator lamp. If the SKIS
indicator lamp comes on and stays on after the bulb test function, diagnosis of the SKIS should be performed with a DRB scan tool and the proper
Diagnostic Procedures.
