Front Wiper Operates by Itself in Fine Weather

Check rain sensor detection area of windshield for dirt such as greases.

OK or NG 

• OK: GO TO 2.
• NG: Clean rain sensor detection area of windshield fully.

With CONSULT-II 

1. Select "IVMS" on CONSULT-II. And select "WIPER" on "SELECT TEST ITEM" screen.
2. Select "DATA MONITOR" on "SELECT DIAG MODE" screen.
3. Make sure that "RAIN SENSOR" of "DATA MONITOR" is 87 % with no water drops in sensor detection area.
   Fig 1: CONSULT II DATA MONITOR Screen

   Courtesy of NISSAN MOTOR CO., U.S.A.

Without CONSULT-II 

With no water drops in sensor detection area, check voltage waveform between BCM harness connector R4 terminal 134 and ground when wiper stops.

134 - Ground: Refer to  , "TERMINALS AND REFERENCE VALUES FOR BCM ".

OK or NG 

• OK: Replace BCM.
• NG: GO TO 3.

1. Turn ignition switch OFF.
2. Disconnect BCM connector and rain sensor connector.
3. Check continuity between rain sensor harness connector R20 terminal 2 and BCM harness connector R4 terminal 134.

   2 - 134: Continuity should exist. 

4. Check continuity between rain sensor harness connector R20 terminal 2 and ground.

   2 - Ground: Continuity should not exist. 

OK or NG 

• OK: GO TO 4.
• NG: Check harness for open or short between rain sensor and BCM.
  Fig 2: Checking Rain Sensor Output Signal Circuit

  Courtesy of NISSAN MOTOR CO., U.S.A.

1. Turn ignition switch ON.
2. Check voltage between rain sensor harness connector R20 terminal 1 and ground.

   1 - Ground: Battery voltage 

OK or NG 

• OK: GO TO 5.
• NG: Check harness for open or short between rain sensor and fuse.
  Fig 3: Checking Rain Sensor Power Supply

  Courtesy of NISSAN MOTOR CO., U.S.A.

1. Turn ignition switch OFF.
2. Check continuity between rain sensor harness connector R20 terminal 3 and ground.

   3 - Ground: Continuity should exist. 

OK or NG 

• OK: Replace rain sensor.
• NG: Check harness ground circuit.
  Fig 4: Checking Rain Sensor Ground Circuit

  Courtesy of NISSAN MOTOR CO., U.S.A.