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DTC P1636: Immobilizer Information Registration Failure: Troubleshooting

TROUBLESHOOTING REFERENCE CHART

Step Action YES NO
1  Was "Immobilizer Control System Check" performed?  Go to Step 2. Go to IMMOBILIZER CONTROL SYSTEM CHECK .
2  DTC Check for ECM 
  1. Check ECM for DTC referring to DTC CHECK .

Is DTC U0073, U0101, U0121 and/or U0140 detected? 		 Go to applicable DTC diag. flow. Go to Step 3.
3  DTC check for BCM 
  1. Check BCM for DTC referring to DTC CHECK .

Is DTC U0073, U0100, U0101, U0155 and/or U1144 detected? 		 Go to applicable DTC diag. flow. Go to Step 4.
4  CAN communication circuit check 
  1. Check for open, short and high resistance in CAN communication circuits between ECM and BCM.

Is each CAN communication circuit in good condition? 		 Go to Step 5. Repair circuit.
5  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? 		 Substitute a known-good ECM and recheck. BCM faulty.
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