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Home >> Honda >> 2007 >> Odyssey Touring >> Repair and Diagnosis >> Body & Frame >> Seats >> Driver Position Memory System (DPMS) >> DTC Troubleshooting >> DTC B1843: Power Seat Control Unit Lost Communication with Power Mirror Control Unit (UART line) >> '08-10 Touring models

'08-10 Touring models

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 DTC with the HDS.
  2. Turn the ignition switch to LOCK (0), and then back to ON (II).
  3. Operate the power seat with the driving position memory switch.
  4. Check for DTCs with the HDS.

    Is DTC B1843 indicated? 

    YES  - Go to step 5.

    NO  - Intermittent failure, the system is OK at this time.

  5. Turn the ignition switch to LOCK (0).
  6. Disconnect the power seat control unit connectors and power mirror control unit connector (24P).
  7. Check for continuity between power seat control unit connector A (40P) No. 39 terminal and power mirror control unit connector (24P) No. 13 terminal.
    Fig 1: Identifying Continuity Between No. 39 Terminal And Power Mirror Control Unit Connector (24P) No. 13 Terminal
    G05526933Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step 8.

    NO  - Repair open in the wire between the power mirror control unit connector (24P) and power seat control unit connector A (40P).

  8. Check for continuity between power seat control unit connector A (40P) No. 39 terminal and body ground.
    Fig 2: Identifying Continuity Between Power Seat Control Unit Connector A (40P) No. 39 Terminal And Body Ground
    G05526934Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair short to ground in the wire.

    NO  - Go to step 9.

  9. Measure the voltage between the No. 24 terminal of the power mirror control unit connector (24P) and body ground.
    Fig 3: Identifying Voltage Between No. 24 Terminal Of Power Mirror Control Unit Connector (24P) And Body Ground
    G05526935Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  - Go to step 10.

    NO  - Check No. 7 (7.5 A) fuse in the driver's under-dash fuse/relay box. If the fuse is OK, repair open in the WHT/RED wire.

  10. Check for continuity between the No. 22 terminal of the power mirror control unit connector (24P) and body ground.
    Fig 4: Identifying Continuity Between No. 22 Terminal Of Power Mirror Control Unit Connector (24P) And Body Ground
    G05526936Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair open in the wire between the power mirror control unit and G601. If the wire is OK, repair G601.

    NO  - Replace the power mirror control unit.

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