DTC Troubleshooting: B1129
  1. Check for continuity between the No. 23 (UNLOCK) and No. 24 (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 wire and UNLOCK wire.■
NO -
Faulty MICU, replace the under-dash fuse/relay box. ■