Power Mirror Position Sensor Troubleshooting

NOTE: Before troubleshooting, check the No. 5 (20 A) and No. 13 (7.5 A) in the passenger's under-dash fuse/relay box and the No. 4 (7.5 A) fuse in the driver's under-dash fuse/relay box and test the power mirrors (see FUNCTION TEST ).

Turn the ignition switch ON (II).
Check for voltage between the B2 and B22 terminals of the passenger's multiplex control unit with the power mirror switch pressed UP or LEFT.

Fig 1: Checking Voltage Between B2 And B22 Terminals Of Passenger's Multiplex Control Unit
Courtesy 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.
Move the selector switch to RIGHT.
Check for voltage between the B5 and B22 terminals with the power mirror switch pressed to the RIGHT or DOWN.

Fig 2: Checking Voltage Between B5 And B22 Terminals With Power Mirror Switch Pressed To RIGHT Or DOWN
Courtesy 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.
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 B3 And B22 Terminals With Power Mirror Switch Pressed To LEFT Or DOWN
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES - Go to step 6.
2. NO - Repair open in the PUR wire.
Move the selector switch to the LEFT.
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 And B22 Terminals With Power Mirror Switch Pressed To RIGHT Or DOWN
Courtesy 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.
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 And B22 Terminals With Power Mirror Switch Pressed To LEFT Or DOWN
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES - Go to step 9.
2. NO - Repair open in the ORN/WHT (PNK/BLU)* wire.
  *: '04-06 models
Turn the ignition switch OFF.
Disconnect passenger's multiplex control unit 22P connector B.
Apply battery power to the B13 terminal and ground the B12 [or B14] terminal.

Fig 6: Applying Battery Power To B13 Terminal And Ground B12 [or B14] Terminal
Courtesy 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 MIRROR ACTUATOR TEST ). If the mirror is OK, repair the open in the LT GRN or YEL/WHT [or BLU/WHT] wires.
Apply battery power to the B16 terminal and ground the B15 [or B17] terminal.

Fig 7: Applying Battery Power To B16 Terminal And Ground B15 [or B17] Terminal
Courtesy 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 MIRROR ACTUATOR TEST ). If the mirror is OK, repair the open in the BLU/ORN or BLU/GRN [or BRN] wires.
Reconnect the 22P connector B to the passenger's multiplex control unit.
Turn the ignition switch ON (II).
Check for voltage between the B8 and B22 terminals.

Fig 8: Checking Voltage Between B8 And B22 Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?
1. YES - Go to step 16.
2. NO - Repair short in the RED/BLK wire. If the wire is OK, substitute with a known-good the passenger's multiplex control unit and recheck.
Check for voltage between the B8 and B19 terminals.

Fig 9: Checking Voltage Between B8 And B19 Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?
1. YES - Go to step 17.
2. NO - Substitute a known-good passenger's multiplex control unit and recheck.
Check for voltage between the B7 and B19 terminals while moving the passenger's mirror from right to left.

Fig 10: Checking Voltage Between B7 And B19 Terminals
Courtesy 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, the right power mirror position sensor is faulty; replace the right power mirror actuator.
Check for voltage between the B10 and B19 terminals while moving the passenger's mirror from up to down.

Fig 11: Checking Voltage Between B10 And B19 Terminals
Courtesy 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, the right power mirror position sensor is faulty; replace the right power mirror actuator.
Check for voltage between the B18 and B19 terminals while moving the driver's mirror from left to right.

Fig 12: Checking Voltage Between B18 And B19 Terminals
Courtesy 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, the left power mirror position sensor is faulty; replace the left power mirror actuator.
Check for voltage between the B20 and B19 terminals while moving the driver's mirror from up to down.

Fig 13: Checking Voltage Between B20 And B19 Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Does the voltage change from about 1 V to 3V?
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, the left power mirror position sensor is faulty; replace the left power mirror actuator.