( TF09E8FK763000Y1277FAAT00 )
DTC Troubleshooting: B1277
DTC B1277:
 Headlight AUTO Position Circuit Malfunction
  1. Clear the DTCs with the HDS.
  1. Turn the ignition switch to LOCK (0) and then back to ON (II).
  1. Turn the combination light switch POSITION (SMALL), AUTO, and ON (low beam) positions for 6 seconds in each position, and then OFF position.
  1. Check for DTCs with the HDS.
Is DTC B1277 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, and enter the DATA LIST.
  1. Check each combination light switch position value with the DATA LIST menu.

    When the combination light switch is turned OFF

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


    When the combination light switch is turned to POSITION (SMALL)

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


    When the combination light switch is turned to AUTO

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


    When the combination light switch is turned ON (HEADLIGHT)

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

Are all data list values correct?
YES -
NO -
Go to Step 7 .
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the combination light switch 12P connector.
  1. Turn the ignition switch to ON (II).
  1. Select LIGHTING from the BODY ELECTRICAL system select menu, and enter the DATA LIST.
  1. Check each combination light switch position value with the DATA LIST menu.

    When the combination light switch is turned OFF

    Data List
    Value
    Headlight Switch (OFF)
    OFF
    Headlight Switch (SMALL)
    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 .
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect under-dash fuse/relay box connector M (34P).
  1. Check for continuity between body ground and under-dash fuse/relay box connector M (34P) No. 5, No. 7, and No. 8 terminals individually.
Is there continuity?
YES -
Repair a short to ground in the wire.■
NO -
  1. Turn the ignition switch to LOCK (0).
Is the combination light switch OK?
YES -
Go to Step 17 .
NO -
Replace the combination light switch.■
  1. Disconnect under-dash fuse/relay box connectors M (34P).
  1. Check for continuity between under-dash fuse/relay box connector M (34P) terminals and the combination light switch 12P connector terminals as shown:
    Under-dash fuse/relay box connector M (34P)
    Combination light switch 12P connector
    8
    10 [9]
    5
    9 [10]
    7
    8 [11]
    33
    7 [12]

    [ ]:
    LHD model (Include KE and KN models)

Is there continuity?
YES -
Go to Step 19 .
NO -
Repair an open in the wire.■
  1. Check for continuity between under-dash fuse/relay box connector M (34P) terminals as shown:
    From terminal
    To terminal
    8
    3, 4, 5, 7
    7
    3, 4, 5

Is there continuity?
YES -
Repair a short between the wires.■
NO -
RHD model (Except KE and KN models)
LHD model (Include KE and KN models)