Power Seat Front Up-down Position Sensor Troubleshooting

Raise the driver's power seat up with the power seat up-down switch, then remove the power seat (see FRONT SEAT REMOVAL/INSTALLATION ).
NOTE: Be careful not to scratch the indicator trim.
Disconnect the power seat control unit connectors (see DRIVER'S POWER SEAT CONTROL UNIT INPUT TEST ).
Disconnect the 4P connector from the front up-down position sensor.
Check for continuity between the No. 2 terminal of the front up-down position sensor and A11 terminal of the power seat control unit.

Fig 1: Checking Continuity Between No. 2 Terminal Of Front Up-Down Position Sensor And A11 Terminal Of Power Seat Control Unit
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Go to step 5.
2. NO - Repair open in the WHT/BLK wire.
Check for continuity between the No. 3 terminal of the front up-down position sensor and A12 terminal of the power seat control unit.

Fig 2: Checking Continuity Between No. 3 Terminal Of Front Up-Down Position Sensor And A12 Terminal Of Power Seat Control Unit
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Go to step 6.
2. NO - Repair open in the GRN/BLK wire.
Reconnect all connectors to run the seat motors.
Turn the ignition switch ON (II).
Check for voltage between the No. 4 terminal of the front up-down position sensor and body ground.

Fig 3: Checking Voltage Between No. 4 Terminal Of Front Up-Down Position Sensor And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?
1. YES - Go to step 9.
2. NO - Repair the open or short in the BRN wire.
Check for voltage pulse between the No. 3 terminal of the front up-down position sensor and body ground when the front up-down switch moves up and down.

Fig 4: Checking Voltage Between No. 3 Terminal Of Front Up-Down Position Sensor And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Does voltage pulse from 0 to about 5 V alternately?
1. YES - Check poor connections or loose terminals between the sensor and the driver's power seat control unit. If OK, replace the power seat control unit.
2. NO - Check for a short in the wire. If the wire is OK, the front up-down position sensor is faulty; replace the front up-down motor assembly.