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Home >> Acura >> 2014 >> TSX Special Edition, Automatic Trans >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Exterior Lights (4-CYL) >> DTC Troubleshooting >> DTC B1275: Headlight Switch OFF Position Circuit Malfunction; DTC B1276: Headlight Switch PARKING Position Circuit Malfunction; DTC B1277: Headlight Switch AUTO Position Circuit Malfunction; DTC B1278: Headlight Switch ON Position Circuit Malfunction

DTC B1275: Headlight Switch OFF Position Circuit Malfunction; DTC B1276: Headlight Switch PARKING Position Circuit Malfunction; DTC B1277: Headlight Switch AUTO Position Circuit Malfunction; DTC B1278: Headlight Switch ON Position 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. Turn the combination light switch to the PARKING, AUTO, and ON (low beam) positions for 6 seconds in each position, and then to the OFF position.
  4. Check for DTCs with the HDS.

    Are DTCs B1275, B1276, B1277, and/or B1278 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, and enter DATA LIST.
  6. Check each combination light switch position value with the DATA LIST menu.

    When the combination light switch is turned OFF 

    COMBINATION LIGHT SWITCH POSITION VALUE CHART

    Data List Value
    Headlight Switch (OFF) ON
    Headlight Switch (PARKING) OFF
    Headlight Switch (AUTO) OFF
    Headlight Switch (HEADLIGHT) OFF

    When the combination light switch is turned to PARKING LIGHT 

    COMBINATION LIGHT SWITCH POSITION VALUE CHART

    Data List Value
    Headlight Switch (OFF) OFF
    Headlight Switch (PARKING) ON
    Headlight Switch (AUTO) OFF
    Headlight Switch (HEADLIGHT) OFF

    When the combination light switch is turned to AUTO 

    COMBINATION LIGHT SWITCH POSITION VALUE CHART

    Data List Value
    Headlight Switch (OFF) OFF
    Headlight Switch (PARKING) OFF
    Headlight Switch (AUTO) ON
    Headlight Switch (HEADLIGHT) OFF

    When the combination light switch is turned ON (HEADLIGHT) 

    COMBINATION LIGHT SWITCH POSITION VALUE CHART

    Data List Value
    Headlight Switch (OFF) OFF
    Headlight Switch (PARKING) ON
    Headlight Switch (AUTO) OFF
    Headlight Switch (HEADLIGHT) ON

    Are all data list values correct? 

    YES  -Faulty driver's MICU; replace the driver's under-dash fuse/relay box, USA models (see DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU)REMOVAL AND INSTALLATION ), Canada models (see SPECIAL TOOLS REQUIRED ).

    NO  -Go to step 7.

  7. Turn the ignition switch to LOCK (0).
  8. Disconnect the combination light switch 12P connector.
  9. Turn the ignition switch to ON (II).
  10. Select LIGHTING from the BODY ELECTRICAL SYSTEM SELECT menu, and enter DATA LIST.
  11. Check each combination light switch position value with the DATA LIST menu.
    COMBINATION LIGHT SWITCH POSITION VALUE CHART

    Data List Value
    Headlight Switch (OFF) OFF
    Headlight Switch (PARKING) OFF
    Headlight Switch (AUTO) OFF
    Headlight Switch (HEADLIGHT) OFF

    Are all data list values indicated OFF? 

    YES  -Go to step  15.

    NO  -Go to step 12.

  12. Turn the ignition switch to LOCK (0).
  13. Disconnect driver's under-dash fuse/relay box connector R (24P).
  14. Check for continuity between body ground and driver's under-dash fuse/relay box connector R (24P) terminals No. 6, No. 7, and No. 8 individually.

    DRIVER'S UNDER-DASH FUSE/RELAY BOX CONNECTOR R (24P) 

    Fig 1: Identifying Driver'S Under-Dash Fuse/Relay Box Connector R (24P)
    G07770479Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short to ground in the wire.

    NO  -Faulty driver's MICU; replace the driver's under-dash fuse/relay box, USA models (see DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU)REMOVAL AND INSTALLATION ), Canada models (see SPECIAL TOOLS REQUIRED ).

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

    Is the combination light switch OK? 

    YES  -Go to step 17.

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

  17. Disconnect driver's under-dash fuse/relay box connector R (24P).
  18. Check for continuity between driver's under-dash fuse/relay box connector R (24P) terminals and the combination light switch 12P connector terminals as shown:
    CONNECTOR TERMINALS REFERENCE CHART

    Driver's under-dash fuse/relay box connector R (24P) Combination light switch 12P connector
    6 (RED) 9 (RED)
    8 (BRN) 10 (BRN)
    7 (GRY) 11 (GRY)
    3 (BLK) 12 (BLK)

    COMBINATION LIGHT SWITCH 12P CONNECTOR 

    Fig 2: Identifying Combination Light Switch 12P Connector
    G07770480Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 19.

    NO  -Repair an open or high resistance in the wire.

  19. Check for continuity between driver's under-dash fuse/relay box connector R (24P) terminals as shown:
    CONNECTOR TERMINALS REFERENCE CHART

    From terminal To terminal
    6 (RED) 7 (GRY)
    8 (BRN)
    21 (RED)
    22 (LT BLU)
    7 (GRY) 8 (BRY)
    21 (RED)
    22 (LT BLU)

    Is there continuity? 

    YES  -Repair a short between the wires.

    NO  -Faulty driver's MICU; replace the driver's under-dash fuse/relay box, USA models (see DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU)REMOVAL AND INSTALLATION ), Canada models (see SPECIAL TOOLS REQUIRED ).

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