DTC P1615: Steering Lock Unit Communication Error: 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	Registration of ignition key Register ignition key in use with ECM referring to REGISTRATION OF THE IGNITION KEY . Was registration of ignition key completed?	Recheck ECM for DTC. If DTC P1615 is still detected, go to Step 3.	Go to Step 3.
3	DTC check for ECM 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 5.
4	DTC check for keyless start control module Check Keyless start control module for DTC referring to DTC CHECK . Is DTC detected?	Go to applicable DTC diag. flow.	Go to Step 5.
5	Check for communication circuit between steering lock unit and keyless start control module With the ignition switch at OFF position, disconnect steering lock unit connector and keyless start control module connector. Check for proper connection at terminals and wires of each connector referring to INTERMITTENT AND POOR CONNECTION INSPECTION . If OK, check for open, short, and high resistance in each circuit between steering lock unit and keyless start control module. Refer to Step 2 in DTC NO. 11: COMMUNICATION ERROR WITH STEERING LOCK UNIT . Is each circuit in good condition?	Go to Step 6.	Repair malfunction part and recheck.
6	Steering lock unit power supply check Connect keyless start control module connector. With ignition switch at ON position, check power supply terminal voltage of steering lock unit connector. Refer to KEYLESS START CONTROL MODULE POWER AND GROUND CIRCUIT CHECK . Is voltage 4 - 6 V?	Replace steering lock unit and recheck.	Substitute a known-good keyless start control module and recheck. If DTC P1615 is still detected, substitute a known-good ECM and recheck.