DTC Troubleshooting: B1827
DTC B1827:
 Power Seat Rear Up-Down Motor Pulse Error
DTC B1827 is stored when the rear up-down switch is operated more than 1 second after the seat moves to the most up or most down position, even when the system is OK.
  1. Clear the DTCs with the HDS.
  1. Turn the ignition switch to LOCK (0) and then back to ON (II).
  1. Operate the power seat adjustment switch in all directions for more than 1 second each.
  1. Check for the DTCs with the HDS.
Is DTC B1827 indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, the system is OK at this time. Check for loose or poor connections.■
  1. Clear the DTCs with the HDS.
Is DTC B1836 also indicated?
YES -
Go to the DTC B1836 troubleshooting.■
NO -
Go to Step 6 .
  1. Clear the DTCs with the HDS.
Are DTCs B1825, B1826, and/or B1828 also indicated?
YES -
Go to Step 17 .
NO -
Go to Step 7 .
  1. Turn the ignition switch to LOCK (0) and then back to ON (II).
  1. Operate the rear up-down switch for 2 seconds, and check the rear up-down motor operation.
Does the rear up-down motor run smoothly?
YES -
Go to Step 9 .
NO -
Go to Step 26 .
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect power seat control unit connector A (40P).
  1. Disconnect the rear up-down motor/position sensor 5P connector.
  1. Check for continuity between power seat control unit connector A (40P) No. 13, No. 15, and No. 29 terminals and the rear up-down motor/position sensor 5P connector No. 3, No. 4, and No. 5 terminals respectively.
Is there continuity?
YES -
Go to Step 13 .
NO -
Repair an open in the wire.■