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DTC Troubleshooting: B1905

DTC B1905:
 Immobilizer-Keyless Control Unit Lost Communication with MICU (DRLOCKSW Message)
  1. Clear the DTCs with the HDS.
  1. Turn the ignition switch to LOCK (0), and then back to ON (II).
  1. Wait for 6 seconds or more.
  1. Check for DTCs witch the HDS.
Is DTC B1905 indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, the immobilizer-keyless control unit is OK at this time. Check for loose or poor connections between the immobilizer-keyless control unit and the MICU.■
  1. Check for DTCs with the HDS.
Are DTCs B1155, B1156, B1157, B1159, B1160, and B1188 all indicated with DTC B1905 at the same time?
YES -
NO -
Replace the immobilizer-keyless control unit .■