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Home >> Acura >> 2009 >> TSX Standard >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Turn Signal/Hazard Warning Lights (4-CYL) >> DTC Troubleshooting >> DTC B1280: Turn Signal Switch Circuit Malfunction

DTC B1280: Turn Signal Switch Circuit Malfunction

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A )
  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 6 seconds or more
  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 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 REFERENCE CHART

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

    When the turn signal switch is in right position 

    DATA LIST REFERENCE CHART

    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 (see DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL/INSTALLATION )

    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 left position 

    DATA LIST REFERENCE CHART

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

    When the turn signal switch is in right position 

    DATA LIST REFERENCE CHART

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

    Do 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 driver's under-dash fuse/relay box connector R (24P)
  11. Check for continuity between body ground and driver's under-dash fuse/relay box connector R (24P) terminals No 13 and No 14
    Fig 1: Checking Continuity Between Body Ground And Driver's Under-Dash Fuse/Relay Box Connector R (24P) Terminals No 13 And No 14
    G05994982Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short to ground in the wire

    NO  -Go to step 12

  12. Check for continuity between driver's under-dash fuse/relay box connector R (24P) terminals No 13 and No 14
    Fig 2: Checking Continuity Between Driver's Under-Dash Fuse/Relay Box Connector R (24P) Terminals No 13 And No 14
    G05994983Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short between the wires

    NO  -Replace the combination light switch

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