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DTC B1280: Turn Signal Switch Circuit Malfunction

WARNING: This page is about a different car, the 2013 Honda Fit, 2012 Honda Fit, 2011 Honda Fit, 2010 Honda Fit, and 2009 Honda Fit. However, it is still accessible from the selected car via links, so may be relevant.
  1. Clear the DTCs with the HDS.
  2. Turn the ignition switch to LOCK (0) and then back to ON (II).
  3. Operate the turn signal switch in left and right positions, and wait for at least 6 seconds.
  4. 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.

  5. Select LIGHTING from the BODY ELECTRICAL system select menu, then enter the DATA LIST.
  6. Check each turn signal switch position value with the DATA LIST menu.

    When the turn signal switch is in left position: 

    DATA LIST TABLE

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

    When the turn signal switch is in right position: 

    DATA LIST TABLE

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

    Are all data list values correct? 

    YES  - Faulty MICU, replace the under-dash fuse/relay box:

    NO  - Go to step  7.

  7. Disconnect the combination light switch 12P connector.
  8. Check each turn signal switch position value with the DATA LIST menu.

    When the turn signal switch is in neutral position: 

    DATA LIST TABLE

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

    Are both values now showing OFF? 

    YES  - Replace the combination light switch (see COMBINATION LIGHT SWITCH TEST/REPLACEMENT ).

    NO  - Go to step  9.

  9. Turn the ignition switch to LOCK (0).
  10. Disconnect under-dash fuse/relay box connector M (34P).
  11. Check for continuity between body ground and under-dash fuse/relay box connector M (34P) terminals No. 2 and No. 6 individually.
    Fig 1: Checking Continuity Between Body Ground & Under-Dash Fuse/Relay Box Connector M (34P) Terminals 2 & 6
    G05960034Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair short to ground in the wires.

    NO  - Go to step 12.

  12. Turn the ignition switch to LOCK (0).
  13. Do the combination light switch test (see COMBINATION LIGHT SWITCH TEST/REPLACEMENT ).

    Is the combination light switch OK? 

    YES  - Go to step  14.

    NO  - Replace the combination light switch. (see COMBINATION LIGHT SWITCH TEST/REPLACEMENT )

  14. Disconnect under-dash fuse/relay box connector M (34P).
  15. Check for continuity between under-dash fuse/relay box connector M (34P) terminals No. 2, No. 6 and No. 33 and combination light switch 12P connector terminals No. 2, No. 1, and No. 12.
    Fig 2: Checking Continuity Between Under-Dash Fuse/Relay Box Connector M (34P) Terminals & Combination Light Switch 12P Connector Terminals
    G00491961Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES -  Go to step  16.

    NO -  Repair an open wire.

  16. Check for continuity between under-dash fuse/relay box connector M (34P) terminals No. 2 and No. 33, and between connector (34P) terminals No. 6 and No. 33 individually.
    Fig 3: Checking Continuity Between Under-Dash Fuse/Relay Box Connector M (34P) Terminals 2 & 33 & Connector Terminals 6 & 3
    G00491962Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES -  Repair a short in the wires.

    NO -  Faulty MICU; replace the under-dash fuse/relay box:

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