DTC Troubleshooting: B1127
  1. Check for continuity between the No. 31 (UNLOCK) and No. 32 (LOCK) terminals of the under-dash fuse/relay box connector T (34P).
Is there continuity?
YES -
Repair a short in the wire between the LOCK and UNLOCK wires.■
NO -
Faulty MICU, replace the under-dash fuse/relay box. ■