DTC B1141: Door Multiplex Control Unit Lost Communication with Front Passenger's Power Window Switch (UART line short)

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Clear the DTCs with the HDS.
Turn the ignition switch OFF, and then back ON (II).
Open and close the front passenger's power window by using the power window master switch manually.
Open and close the front passenger's power window by using the front passenger's power window switch manually.
Check for DTCs with the HDS.
Is DTC B1141 indicated?

YES -Go to step 6.

NO -The system is OK at this time. Check for loose or poor connections at the passenger's power window switch connector.
Turn the ignition switch OFF.
Disconnect the door multiplex control unit connectors and front passenger's power window switch connector.
Check for continuity between door multiplex control unit connector B (14P) No. 4 terminal and body ground.

Fig 1: Checking Continuity Between Door Multiplex Control Unit Connector B (14P) No. 4 Terminal And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair a short in the wire.

NO -Substitute a known-good door multiplex control unit, and recheck. If DTC is gone, the original door multiplex control unit is faulty; replace it. If the DTC B1141 is still indicated, replace the front passenger's power window switch.