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.
3. Does the input signal change corresponding to the switch operation?

• Yes  → Go to step  4.
• No  → Go to step 2.

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 body integrated unit and wiper switch.
   Fig 1: Identifying Integrated Unit And Wiper Switch Connector Terminals

   Courtesy of SUBARU OF AMERICA, INC.

   Connector & terminal 

   (B280) No. 32 - (B70) No. 10: 

   (B280) No. 12 - (B558) No. 4: 

   (B280) No. 22 - (B558) No. 5: 

4. Is the resistance less than 10 Ω?

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

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

   Connector & terminal 

   (B280) No. 5 (+) - Chassis ground (-): 

   (i171) No. 17 (+) - Chassis ground (-): 

3. Is the voltage 10 V or more?

• Yes  → Go to step 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 in step ( 2) is performed, check the output signal of body integrated unit to rear wiper motor.
4. 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 step 5.
• No  → Replace the body integrated unit. < Refer to 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 in step ( 2) is performed, check the output signal of body integrated unit.
4. 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 step  8.
• No  → Go to step 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 - (D43) No. 2: 

4. Is the resistance less than 10 Ω?

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

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

   Connector & terminal 

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

3. Is there continuity between terminals?

• Yes  → Go to step 8.
• No  → Replace the rear wiper motor assembly.

1. Disconnect the harness connector of the rear wiper motor.
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 (-): 

4. Is the voltage 10 V or more?

• Yes  → Go to step 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: 

3. Is the resistance less than 10 Ω?

• Yes  → Go to step 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 rear wiper motor.
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. 1: 

5. Is the resistance less than 10 Ω?

• Yes  → Go to step 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 rear wiper motor.
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 (-): 

5. 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 step 12.
• No  → Replace the body integrated unit. < Refer to BODY INTEGRATED UNIT . >

1. Remove the rear wiper motor.
2. Check the rear wiper motor. < Refer to INSPECTION , Rear Wiper Motor. >
3. Does the rear wiper motor rotate normally?

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