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DTC P1636: Immobilizer Information Registration Failure: Troubleshooting

Step Action Yes No
1  Diagnostic Trouble Code (DTC) confirmation 
  1. Clear DTC(s) referring to DTC CLEARANCE .
  2. Turn the ignition switch to OFF position.
  3. Check if any DTC is detected referring to DTC CHECK .

Is DTC P1636 still detected? 		 Go to Step 2. The troubleshooting is completed.
2  Diagnostic Trouble Code (DTC) check in ECM 
Is any DTC other than P1636 detected in Step 1? 		 Perform the troubleshooting referring to the corresponding flowchart. Go to Step 3.
3  Diagnostic Trouble Code (DTC) check in BCM 
  1. Check BCM for DTC referring to DTC CHECK .

Is any DTC detected? 		 Perform the troubleshooting referring to the corresponding flowchart, refer to BODY ELECTRICAL CONTROL SYSTEM . Go to Step 4.
4  Replacement of BCM 
  1. Replace BCM with new one referring to BCM REMOVAL AND INSTALLATION .
  2. Check ECM for DTC referring to DTC CHECK .

Is DTC P1636 still detected? 		 Go to Step 5. The troubleshooting is completed.
5  Replacement of ECM 
  1. Replace ECM with new one referring to ECM (ENGINE CONTROL MODULE) REMOVAL AND INSTALLATION .
  2. Check ECM for DTC referring to DTC CHECK .

Is DTC P1636 still detected? 		 Recheck CAN communication wire circuits and poor connection at ECM, ABS control module and BCM connectors. The troubleshooting is completed.
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