DTC Troubleshooting: B1128
DTC B1128:
 Driver's Door Lock Switch Signal Error (LOCK/UNLOCK)
  1. Clear the DTCs with the HDS.
  1. Turn the ignition switch OFF, and then back ON (II).
  1. Operate the driver's door lock switch LOCK/UNLOCK ten times.
  1. Check for DTCs with the HDS.
Is DTC B1128 indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, the driver's door lock is OK at this time.■
  1. With the driver's door lock switch in the neutral position, select KEYLESS from the HDS and enter the DATA LIST.
  1. Check the ON/OFF information of the DRIVER'S DOOR LOCK SWITCH (LOCK) and DRIVER'S DOOR LOCK SWITCH (UNLOCK) in the DATA LIST.
Are both information indicators OFF?
YES -
Faulty MICU, replace the under-dash fuse/relay box.■
NO -
Go to Step 7 .
  1. Disconnect the power window master switch 22P connector.
  1. Check the ON/OFF information of the DRIVER'S DOOR LOCK SWITCH (LOCK) and DRIVER'S DOOR LOCK SWITCH (UNLOCK) in the DATA LIST.
Are both information indicators OFF?
YES -
Faulty door lock switch; replace the power window master switch. ■
NO -
Go to Step 9 .
  1. Turn the ignition switch OFF.
  1. Disconnect the under-dash fuse/relay box connector T (34P).
  1. Check for continuity between the No. 28 (LOCK) and No. 27 (UNLOCK) terminals of the under-dash fuse/relay box connector T (34P) and body ground.
Are there continuity?
YES -
Repair a short in the LOCK or UNLOCK wire.■
NO -
Go to Step 12 .