DTC P1615: Steering Lock Unit Communication Error: Troubleshooting

WARNING: This page is about a different car, the 2011 Suzuki SX4. However, it is still accessible from the selected car via links, so may be relevant.

P1615: TROUBLESHOOTING 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 of ECM Check ECM for DTC referring to DTC CHECK . Is DTC U0073, U0101, U0121, U0140 and/or U0155 detected?	Go to applicable DTC troubleshooting.	Go to Step 4.
4	DTC check of keyless start control module Check keyless start control module for DTC referring to DTC CHECK . Is DTC detected?	Go to applicable DTC troubleshooting.	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 circuit.
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 Step 3 in DTC NO. 11: COMMUNICATION ERROR WITH STEERING LOCK UNIT . 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.