Rear Wiper

Check the input signal when the rear wiper switch is operated using Subaru Select Monitor.

1. Turn the ignition switch to ON.
2. Operate the rear wiper switch to each position of ON, INT and Washer ON.

Does the input signal change corresponding to the switch operation?

• Yes: Go to  4.
• No: Go to  2.

1. Turn the ignition switch to OFF, disconnect the ground cable from battery. Ref. to NOTE>NOTE>BATTERY .
   NOTE: For model with battery sensor, disconnect the ground terminal from battery sensor.
2. Disconnect the connector of body integrated unit and wiper switch.
3. Measure the resistance between body integrated unit and wiper switch.

Fig 1: Measure Resistance Between Body Integrated Unit, Wiper Switch And Connector End View

Courtesy of SUBARU OF AMERICA, INC.

Connector & terminal 

(B280) No. 30 - (B70) No. 5:

(B280) No. 22 - (B558) No. 6:

(B280) No. 12 - (B558) No. 7:

Is the resistance less than 10 Ω?

• Yes: Go to  3.
• No: Repair the harness between the body integrated unit and wiper switch.

1. Connect the ground cable to battery. Ref. to NOTE>NOTE>BATTERY .
2. Turn the ignition switch to ON and check the input voltage of body integrated unit.

Connector & terminal 

(i84) No. 6 (+) - Chassis ground (-):

(B281) No. 3 (+) - Chassis ground (-):

Is the voltage 10 V or more?

• Yes: Go to  4.
• No: Check the harness and fuse.

Check the output signal when the rear wiper switch is operated using Subaru Select Monitor.

1. Turn the ignition switch to ON.
2. Operate the rear wiper switch to ON and Washer ON.
3. When the operation above is performed, check the output signal of body integrated unit to rear wiper motor.

When the rear wiper switch is set to ON, is ON output continuous? Also, when the washer is set to ON, is ON output?

• Yes Go to  5.
• No: Replace the body integrated unit. Ref. to SECURITY AND LOCKS>Body Integrated Unit .

Check the output signal when the rear wiper switch is operated using Subaru Select Monitor.

1. Turn the ignition switch to ON.
2. Set the rear wiper switch to INT.
3. When the operation above is performed, check the output signal of body integrated unit.

When the rear wiper switch is set to INT, is ON/OFF output repeated? (INT OFF time (when vehicle parked): 12 seconds)

• Yes: Go to  8.
• No: Go to  6.

1. Turn the ignition switch to OFF, disconnect the ground cable from battery.
2. Disconnect the connector of body integrated unit and wiper switch.
3. Measure the resistance between the harness connector terminals of the body integrated unit and rear wiper motor.

Connector & terminal 

(B280) No. 6 - (B97) No. 11:

Is the resistance less than 10 Ω?

• Yes: Go to  7.
• No: Repair the open circuit of the harness between body integrated unit and rear wiper motor.

1. Disconnect the harness connector of the motor assembly - rear wiper.
2. Check the continuity of the circuit of rear wiper motor stop position.

Connector & terminal 

(D43) No. 1 (+) - (D43) No. 4 (-):

Is there continuity between terminals?

• Yes: Go to  8.
• No: Replace the motor assembly - rear wiper.

1. Disconnect the harness connector of the motor assembly - rear wiper.
2. Turn the ignition switch to ON.
3. Measure the voltage between the rear wiper motor harness connector terminal and chassis ground.

   Connector & terminal 

   (D43) No. 3 (+) - Chassis ground (-):

Is the voltage 10 V or more?

• Yes: Go to  9.
• No: Check the fuse (No. 27 in main fuse box).

1. Turn the ignition switch to OFF.
2. Measure the resistance between the rear wiper motor harness connector terminal and chassis ground.

Connector & terminal 

(D43) No. 4 - Chassis ground:

Is the resistance less than 10 Ω?

• Yes: Go to  10.
• No: Repair the open circuit of the rear wiper motor ground circuit.

1. Turn the ignition switch to OFF.
2. Disconnect the harness connector of body integrated unit.
3. Disconnect the harness connector of the motor assembly - rear wiper.
4. Measure the resistance between the harness connector terminals of the body integrated unit and rear wiper motor.

Connector & terminal 

(B280) No. 7 - (D43) No. 2:

Is the resistance less than 10 Ω?

• Yes: Go to  11.
• No: Repair the open circuit of the harness between body integrated unit and rear wiper motor.

1. Connect the harness connector of body integrated unit.
2. Disconnect the connector of the motor assembly - rear wiper.
3. Turn the ignition switch to ON.
4. Measure the voltage between rear wiper motor connector and chassis ground.

Connector & terminal 

(D43) No. 2 (+) - Chassis ground (-):

Is the voltage less than 1.5 V when the rear wiper switch is OFF, and is the voltage 10 V or more when the rear wiper switch is ON?

• Yes: Go to  12.
• No: Replace the body integrated unit. Ref. to SECURITY AND LOCKS>Body Integrated Unit .

1. Remove the motor assembly - rear wiper.
2. Check the rear wiper motor. Ref. to WIPER AND WASHER SYSTEMS>Rear Wiper Motor>INSPECTION .

Does the rear wiper motor rotate normally?

• Yes: Yes  → Finished.
• No: No  → Replace the motor assembly - rear wiper.