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Immobilizer Indicator Light Remains ON after Engine Starts: Troubleshooting

IMMOBILIZER INDICATOR LIGHT TROUBLESHOOTING CHART

Step Action YES NO
1  DTC check 
  1. Check DTC referring to DTC CHECK .

Is DTC P1645 or P1646 detected? 		 Go to applicable DTC troubleshooting. Substitute a known-good combination meter and recheck. If still indicator light remains ON, substitute a known-good ECM and recheck.
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