Sentry Key® Immobilizer System
To avoid serious or fatal injury on vehicles equipped with airbags, disable the Supplemental Restraint System (SRS) before attempting any steering wheel, steering column, airbags, airbag curtains, knee blocker, seat belt tensioner, impact sensor or instrument panel component diagnosis or service. Disconnect the Intelligent Battery Sensor (IBS)/negative battery cable assembly from the negative battery post, 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 SRS. Failure to take the proper precautions could result in accidental airbag deployment.
The hard wired circuits between modules and components related to the Sentry Key® Immobilizer System (SKIS) may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds. For proper wire repair, refer to: WIRE SPLICING and for connector repair procedures, refer to: REMOVAL and INSTALLATION .
However, conventional diagnostic methods will not prove conclusive in the diagnosis of the SKIS or the electronic controls and communication between other modules and devices that provide features of the SKIS. The most reliable, efficient and accurate means to diagnose the SKIS or the electronic controls and 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. Ineffective Light-Emitting Diode (LED). | 1. Use a diagnostic scan tool to perform the Instrument Panel Cluster (IPC) actuator test. Refer to the appropriate diagnostic information. |
| 2. Ineffective fuse. | 2. Check the Radio Frequency Hub (RF-Hub) fused B(+) fuse and the fused ignition output (run-start) fuse in the Power Distribution Center (PDC). Replace the fuses, if required. | |
| 3. Ineffective ground circuit. | 3. Test and repair the open ground circuit at the connector for the RF-Hub, if required. | |
| 4. Ineffective battery feed circuit. | 4. Test and repair the open battery feed circuit at the connector for the IPC, if required. | |
| 5. Ineffective ignition feed circuit. | 5. Test and repair the open ignition feed circuit at the connector for the IPC, if required. | |
| SECURITY INDICATOR FLASHES FOLLOWING BULB TEST | 1. Invalid key in the ignition switch lock cylinder or an invalid FOB with Integrated Key (FOBIK). | 1. Remove the invalid key or FOBIK and try again with a known valid key or FOBIK. |
| 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. |
| 2. SKIS system ineffective. | 2. Use a diagnostic scan tool and the appropriate diagnostic information for further diagnosis. | |