( TL19E00K769000Y1277FAAT00 )

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