Sentry Key Immobilizer System (SKIS) Basic Checks

If you suspect that the fault condition is due to a wiring problem, complete the following steps listed below. If you suspect that it is a functional problem, skip these steps and continue on to the 'General Troubleshooting Guidelines'.
1. Check the fuses in the fuse block. If OK, go to Step 2. If not OK, repair the shorted circuit or component, as required, and replace the faulty fuse.
2. Disconnect and isolate the battery negative cable. Unplug the wire harness connector at the SKIM. Check for continuity between the ground circuit cavity of the SKIM wire harness connector and a good ground. There should be continuity. If OK, go to Step 3. If not OK, repair the open circuit. to ground as required.
3. Connect the battery negative cable. Check for battery voltage at the fused B(+) circuit cavity of the SKIM wire harness connector. IF OK, go to Step 4. If not OK, repair the open circuit to the fuse in the fuse block as required.
4. Turn the ignition switch to the ON position. Check for battery voltage at the fused ignition switch output (run/start) circuit cavity of the SKIM wire harness connector. If OK, proceed to the next. If not OK, repair the open circuit to the fuse in the fuse block as required.

GENERAL TROUBLESHOOTING TIPS
1. Using a DRB III scan tool, read and record the faults as they exist in the module when you first start your analysis of the vehicle. It is important to document these faults because the SKIM does not differentiate between historical faults (those faults that occurred in the past) and active faults (those faults that are present now). If this problem turns out to be an intermittent condition, this information may become very valuable to your analysis.
2. Using a DRB III scan tool, erase the faults in the Sentry Key Immobilizer Module (SKIM).
3. Turn the ignition OFF and back ON again.
4. Using a DRB III scan tool, read the faults now listed in the Sentry Key Immobilizer Module (SKIM).
5. Using the fault information you now have, refer to the proper Body Diagnostic Procedures for additional specific steps.