DTC Troubleshooting: B1280
DTC B1280:
 Turn Signal Switch Circuit Malfunction
  1. Clear the DTCs with the HDS.
  1. Turn the ignition switch to LOCK (0) and then back to ON (II).
  1. Operate the turn signal switch in left and right positions.
  1. Check for DTCs with the HDS.
Is DTC B1280 indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, the system is OK at this time. Check for loose or poor connections.■
  1. Select LIGHTING from the BODY ELECTRICAL system select menu, then enter the DATA LIST.
  1. Check each turn signal switch position value with the DATA LIST menu.

    When the turn signal switch is in left position

    Data List
    Value
    Turn Signal Switch (LEFT)
    ON
    Turn Signal Switch (RIGHT)
    OFF


    When the turn signal switch is in right position

    Data List
    Value
    Turn Signal Switch (LEFT)
    OFF
    Turn Signal Switch (RIGHT)
    ON

Are all data list values correct?
YES -
Faulty driver's MICU; replace the driver's under-dash fuse/relay box. ■
NO -
Go to Step 7 .
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the combination light switch 12P connector.
  1. Disconnect driver's under-dash fuse/relay box connector R (24P).
  1. Check for continuity between body ground and driver's under-dash fuse/relay box connector R (24P) No. 13 and No. 14 terminals.
Is there continuity?
YES -
Repair a short to ground in the wire.■
NO -
Go to Step 11 .