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Power Mirror Position Sensor Troubleshooting

NOTE: Before troubleshooting, check the No. 4 (7.5A) fuse in the driver's under-dash fuse/relay box and test the power mirrors.
  1. Turn the ignition switch ON (II).
  2. Check for voltage between the B2 and B22 terminals of the passenger's multiplex control unit with the power mirror switch pressed UP.
    Fig 1: Checking Voltage At Multiplex Control Unit, Passenger's Connector B
    G01157055Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  -Go to step 3.
    2. NO  -Repair open in the RED/WHT or BLK wire.
  3. Move the selector switch to Right.
  4. Check for voltage between the B5 and B22 terminals with the power mirror switch pressed to the Right.
    Fig 2: Checking Voltage Between B5 & B22 Terminals
    G01157056Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  -Go to step 5.
    2. NO  -Repair open in the BLU/BLK wire.
  5. Check for voltage between the B3 and B22 terminals with the power mirror switch pressed to the Left or Down.
    Fig 3: Checking Voltage Between B5 & B22 Terminals
    G01157057Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  -Go to step 6.
    2. NO  -Repair open in the PUR wire.
  6. Move the selector switch to Left.
  7. Check for voltage between the B6 and B22 terminals with the power mirror switch pressed to the Right or Down.
    Fig 4: Checking Voltage Between B6 & B22 Terminals
    G01157058Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  -Go to step 8.
    2. NO  -Repair open in the BLU/RED wire.
  8. Check for voltage between the B4 and B22 terminals with the power mirror switch pressed to the Left or Down.
    Fig 5: Checking Voltage Between B4 & B22 Terminals
    G01157059Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  -Go to step 9.
    2. NO  -Repair open in the ORN/WHT wire.
  9. Turn the ignition switch OFF.
  10. Disconnect the passenger's multiplex control unit 22P connector B.
  11. Apply battery power to the B13 terminal and ground the B12 [or B14] terminal.
    Fig 6: Applying Battery Power & Ground
    G01157060Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Does right mirror swing left [or tilt down] ? 

    1. YES  -Go to step 12.
    2. NO  -Check the power mirror actuator (see POWER MIRRORS ). If the mirror is OK, repair the open in the YEL/WHT or LT GRN [BLU/WHT] wires.
  12. Apply battery power to the B16 terminal and ground the B15 [or B17] terminal.
    Fig 7: Applying Battery Power & Ground
    G01157061Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Does left mirror swing left [or tilt down] ? 

    1. YES  -Go to step 13.
    2. NO  -Check the power mirror actuator (see POWER MIRRORS ). If the mirror is OK, repair the open in the BLU/GRN or BLU/ORN [BRN] wires.
  13. Reconnect the 22P connector B to the passenger's multiplex control unit.
  14. Turn the ignition switch ON (II).
  15. Check for voltage between the B8 and B22 terminals.
    Fig 8: Checking Voltage Between B8 & B22 Terminals
    G01157062Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    1. YES  -Go to step 16.
    2. NO  -Repair open or short in the RED/BLK wire. If the wire is OK, replace the passenger's multiplex control unit.
  16. Check for voltage between the B8 and B19 terminals.
    Fig 9: Checking Voltage B8 & B19 Terminals
    G01157063Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    1. YES  -Go to step 17.
    2. NO  -Repair open or short in the BRN/WHT wire. If the wire is OK, faulty power mirror position sensor, replace the power mirror actuator.
  17. Check for voltage between the B7 and B19 terminals while moving the mirror from right to left.
    Fig 10: Checking Voltage between B7 & B19 Terminals
    G01157064Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Does the voltage change from about 3 V to 1 V ? 

    1. YES  -Go to step 18.
    2. NO  -Repair open or short in the GRN wire. If the wire is OK, faulty right power mirror position sensor, replace the right power mirror actuator.
  18. Check for voltage between the B10 and B19 terminals while moving the mirror from up to down.
    Fig 11: Checking Voltage Between B10 & B19 Terminals
    G01157065Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Does the voltage change from about 1 V to 3 V ? 

    1. YES  -Go to step 19.
    2. NO  -Repair open or short in the GRN/RED wire. If the wire is OK, faulty right power mirror position sensor, replace the right power mirror actuator.
  19. Check for voltage between the B18 and B19 terminals while moving the mirror from left to right.
    Fig 12: Checking Voltage Between B18 & B19 Terminals
    G01157066Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Does the voltage change from about 3 V to 1 V? 

    1. YES  -Go to step 20.
    2. NO  -Repair open or short in the GRN/WHT wire. If the wire is OK, faulty left power mirror position sensor, replace the left power mirror actuator.
  20. Check for voltage between the B20 and B19 terminals while moving the mirror from up to down.
    Fig 13: Checking Voltage Between B20 & B19 Terminals
    G01157067Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Does the voltage change from about 1 V to 3 V? 

    1. YES  -Substitute a known good passenger's multiplex control unit, and recheck. If the systems now work OK, replace the original passenger's unit.
    2. NO  -Repair open or short in the GRY wire. If the wire is OK, faulty left power mirror position sensor, replace the left power mirror actuator.
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