LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Acura >> 2007 >> RL >> Repair and Diagnosis (Single Page) >> Electrical >> Fuses & Circuit Breakers >> Under-Hood Fuse/Relay Box >> DTC Troubleshooting >> DTC B1064: Relay Control Module Lost Communication with Driver's MPCS Unit (DOORSW Message); DTC B1065: Relay Control Module Lost Communication with Driver's MPCS Unit (DRLOCKSW Message)
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC B1064: Relay Control Module Lost Communication with Driver's MPCS Unit (DOORSW Message); DTC B1065: Relay Control Module Lost Communication with Driver's MPCS Unit (DRLOCKSW Message)

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 ).
  1. Clear the DTCs with the HDS.
  2. Turn the ignition switch OFF, and then back ON (II).
  3. Wait for 6 seconds or more.
  4. Check for DTCs with the HDS.

    Is DTCs B1064 and/or B1065 indicated? 

    YES  - Go to step 5.

    NO  - Intermittent failure, the system is OK at this time. Check for loose or poor connections between the relay control module and the driver's MPCS unit.

  5. Check for DTCs with the HDS.

    Are DTCs B1014, B1015, B1181, B1182, B1405, B1613, B1614, and B1811 all indicated? 

    ( * : '05-06 models) 

    YES  - Do the driver's MPCS unit input test (see DRIVER'S MPCS UNIT INPUT TEST ).

    NO  - Do the relay control module input test (see RELAY CONTROL MODULE INPUT TEST ).