DTC Troubleshooting: B1277
  1. 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:
    Driver's under-dash fuse/relay box connector R (24P)
    Combination light switch 12P connector
    6
    9 [10]
    8
    10 [9]
    7
    11 [8]
    3
    12 [7]

    [ ]:
    KQ model

Is there continuity?
YES -
Go to Step 19 .
NO -
Repair an open in the wire.■
  1. Check for continuity between driver's under-dash fuse/relay box connector R (24P) terminals as shown:
    From terminal
    To terminal
    6
    7, 8, 21, 22
    7
    8, 21, 22

Is there continuity?
YES -
Repair a short between the wires.■
NO -
Faulty driver's MICU; replace the driver's under-dash fuse/relay box. ■

LHD model, KE and KN models
KQ model