Sentry Key Immobilizer System

WARNING: This page is about a different car, the 2006 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: To avoid personal injury or death, on vehicles equipped with airbags, disable the supplemental restraint system before attempting any steering wheel, steering column, airbag, occupant classification system, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the supplemental restraint system. Failure to take the proper precautions could result in accidental airbag deployment.

The hard wired circuits between components related to the SKIS may be diagnosed using conventional diagnostic tools and procedures. Refer to the SYSTEM WIRING DIAGRAMS article. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the SKIS or the electronic communication between other modules and components that provide features of the SKIS. The most reliable, efficient, and accurate means to diagnose the SKIS or the electronic communication related to SKIS operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.

SENTRY KEY IMMOBILIZER SYSTEM DIAGNOSIS
CONDITION	POSSIBLE CAUSES	CORRECTION
SECURITY INDICATOR FAILS TO LIGHT DURING BULB TEST	1. Light-Emitting Diode (LED) ineffective.	1. Use a diagnostic scan tool to perform the instrument cluster actuator test. Refer to the appropriate diagnostic information.
SECURITY INDICATOR FAILS TO LIGHT DURING BULB TEST	2. Fuse ineffective.	2. Check the SKREEM fused B(+) fuse and the fused ignition switch output (run-start) fuse in the Junction Block (JB). Replace the fuses, if required.
-	3. Ground path ineffective.	3. Check for continuity to ground at the connector for the SKREEM. Repair the circuit to ground, if required.
-	4. Battery feed ineffective.	4. Check for battery voltage at the connector for the SKREEM. Repair the battery feed circuit, if required.
-	5. Ignition feed ineffective.	5. Check for battery voltage at the connector for the SKREEM with the ignition switch in the ON position. Repair the ignition feed circuit, if required.
SECURITY INDICATOR FLASHES FOLLOWING BULB TEST	1. Invalid key in ignition switch lock cylinder.	1. Replace the key with a known valid key.
SECURITY INDICATOR FLASHES FOLLOWING BULB TEST	2. Key-related fault.	2. Use a diagnostic scan tool and the appropriate diagnostic information for further diagnosis.
SECURITY INDICATOR LIGHTS SOLID FOLLOWING BULB TEST	1. SKIS system malfunction/fault detected.	1. Use a diagnostic scan tool and the appropriate diagnostic information for further diagnosis.
SECURITY INDICATOR LIGHTS SOLID FOLLOWING BULB TEST	2. SKIS system ineffective.	2. Use a diagnostic scan tool and the appropriate diagnostic information for further diagnosis.