DTC Troubleshooting: B1827
  1. Measure the voltage between power seat control unit connector A (40P) terminals No. 15 and No. 29.
Is there battery voltage when the rear up-down switch is operated?
YES -
Replace the seat frame assembly.■
NO -
Replace the power seat control unit .■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect power seat control unit connector B (18P).
  1. Disconnect the rear up-down motor/position sensor 5P connector.