Low Washer Warning Light Is Always Off

Trouble symptom: 

Low washer fluid warning light is not displayed, even when the washer fluid level is low.

Wiring diagram: 

Front wiper and washer system Ref. to WIRING SYSTEM>FRONT WIPER AND WASHER SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. BASIC INSPECTION  .

   Perform "Basic inspection" of Front relay control module. Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>GENERAL DESCRIPTION>INSPECTION .

   Is the check result OK?

   Yes:  Go to  2.

   No:  Repair the defective portion.

   No:  no yes no

2. CHECK DATA MONITOR  .
   1. Turn the ignition switch to ON.
   2. Using the Subaru Select Monitor, check the following items in the [Data Monitor] of [Front Relay Control Module]. Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>DATA MONITOR .
      • Washer Level Sensor Input

   Is [ON] displayed?

   Yes:  Perform the inspection according to the diagnosis for combination meter. Ref. to COMBINATION METER (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE . If defective is not improved, replace Front relay control module. Ref. to BODY CONTROL/COMMUNICATION SYSTEM>FRONT RELAY CONTROL MODULE .

   No:  Go to  3.

3. CHECK CONNECTOR  .
   1. Turn the ignition switch to OFF.
   2. Disconnect Front relay control module connector (B68).

   Is there poor contact of connector?

   Yes:  Repair or replace the poor contact of connector.

   No:  Go to  4.

4. CHECK INPUT CIRCUIT OF Front relay control module  .
   1. Connect the Front relay control module connector (B68).
   2. Turn the ignition switch to ON.
   3. Using a tester, measure the voltage between washer fluid level sensor connector (B102) and chassis ground.

      Connector & terminal 

      (B102) No. 1 (+) - Chassis ground (-):

   Is the voltage 9 - 16 V?

   Yes:  Go to  5.

   No:  Replace Front relay control module. Ref. to BODY CONTROL/COMMUNICATION SYSTEM>FRONT RELAY CONTROL MODULE .

5. CHECK HARNESS (OPEN CIRCUIT)  .
   1. Turn the ignition switch to OFF.
   2. Disconnect Front relay control module connector (B68).
   3. Disconnect the washer fluid level sensor connector.
   4. Using a tester, measure the resistance between Front relay control module connector (B68) and washer fluid level sensor connector (B102).

      Connector & terminal 

      (B68) No. 14 - (B102) No. 1:

   Is the resistance less than 10 Ω?

   Yes:  Go to  6.

   No:  Repair or replace the open circuit of harness.

6. CHECK HARNESS (OPEN CIRCUIT)  .

   Using a tester, measure the resistance between washer fluid level sensor connector (B102) and chassis ground.

   Connector & terminal 

   (B102) No. 2 - Chassis ground:

   Is the resistance less than 10 Ω?

   Yes:  Replace the washer level sensor. Ref. to WIPER AND WASHER SYSTEMS>WASHER TANK AND MOTOR .

   No:  Repair or replace the open circuit of harness.