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Washer Malfunction

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    • Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Windscreen Washer Switch Signal

2

1

1

--

Washer Fluid Level Switch Signal

4

3

3

--

Windscreen Washer Fluid Pump Control

1

1

2

--

Windscreen Washer Relay Control

B3873 02

1

2

--

Washer Fluid Level Switch Ground

--

3

--

-

Windscreen Washer Fluid Pump Ground

--

1

--

--

1. Front Washer Inoperative.

2. Front Washer Always ON.

3. Washer Fluid Level Indicator Inoperative.

4. Washer Fluid Level Indicator Always ON.

Circuit/System Description

The body control module (BCM) controls the windscreen washer fluid pump based on an input from the wiper/washer switch. The BCM monitors the washer switch through the windscreen washer switch signal circuit. When the wash switch is closed, ground is supplied to the windscreen washer switch signal circuit. When this is the case, the BCM will command the windscreen washer fluid pump and the low speed wipers on.

On some vehicles, warning information (wash fluid low) will be conveyed via the GMLAN to the controls and displays subsystem (responsible for display). This subsystem will provide visual feedback to the customer while in the RUN power mode.

Reference Information

Schematic Reference

Wiper/Washer Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Wiper/Washer System Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification
  1. Vehicle in Service Mode, observe the scan tool Windscreen Washer Switch parameter while pressing and releasing the S82 Windscreen Wiper/Washer Switch. The parameter should change between INACTIVE and ACTIVE.
    2. ⇒If the reading does not change between INACTIVE and ACTIVE, refer to Windscreen Washer Switch Circuit Test.
  2. Command the Windscreen Washer Relay Command ON and OFF with a scan tool. The windscreen washers should turn ON and OFF when changing between the commanded states.
    3. ⇒If the windscreen washers do not turn ON and OFF, refer to Washer Pump Circut Test
  3. Verify the washer fluid level is above the minimum level.
    4. ⇒If not above the minimum level, fill the reservoir and inspect for leaks. If the low washer fluid indicator is still ON, refer to Low Washer Fluid Indicator Test.

Circuit/System Testing

Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

Windscreen Washer Switch Circuit Test

  1. Vehicle OFF, disconnect the harness connector at the S82 Windscreen Wiper/Washer Switch.
  2. Verify that a test lamp illuminates between low reference circuit terminal 2 and B+.
    3. ⇒If the test lamp does not illuminate, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  3. Vehicle in Service Mode, verify the scan tool Windscreen Washer Switch parameter is INACTIVE.
    4. ⇒If not the specified value, test the signal circuit terminal 5 for a short to ground. If the circuit tests normal, replace the K9 BCM.
  4. Install a 3 A fused jumper wire between the signal circuit terminal 5 and ground. Verify the scan tool Windscreen Washer Switch parameter is ACTIVE.
    5. ⇒If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  5. If all circuits test normal, test or replace the S82 windscreen wiper/washer switch.

Washer Pump Circuit Test

  1. Vehicle OFF, disconnect the X1 harness connector at the X50A under-bonnet fuse block.
  2. Connect a test lamp between the control circut terminal 35 and ground.
  3. Vehicle in Service Mode, command the Windscreen Washer Relay Command ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    4. ⇒If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
    ⇒If the test lamp is always OFF, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K9 BCM.
  4. Vehicle OFF, connect the X1 harness at the X50A under-bonnet fuse block and disconnect the harness connector at the G24 Windscreen Washer Pump.
  5. Test for less than 5 Ω between the ground circuit terminal 2 and ground.
    6. ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  6. Connect a test lamp between control circuit terminal 1 and ground.
  7. Vehicle in Service Mode, command the Windscreen Washer Relay Command On and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    8. ⇒If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the X50A underbonnet fuse block.
    ⇒If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the X50A underbonnet fuse block.
  8. If all circuits test normal, test or replace the G24 Windscreen Washer Pump.

Low Washer Fluid Indicator Malfunction

  1. Vehicle OFF, disconnect the harness connector at the B118B windscreen washer fluid level sensor.
  2. Test for less than 5 Ω between the ground terminal 2 and ground.
    3. ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Vehicle in Service Mode, verify the scan tool Washer Fluid Level Switch parameter is OFF.
    4. ⇒If not the specified value, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the P16 instrument cluster.
  4. Install a 3 A fused jumper wire between the signal circuit terminal 1 and ground. Verify the scan tool Washer Fluid Level Switch parameter is ON.
    5. ⇒If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the P16 instrument cluster.
  5. If all circuits test normal, test or replace the B118B windscreen washer fluid level sensor.

Component Testing

Washer Switch Test

  1. Vehicle OFF, disconnect the harness connector at the S82 Windscreen Wiper/Washer Switch.
  2. Test for less than 5 Ω between the switch terminals 2 and 5 while activating the washer function.
    3. ⇒If not the specified value, replace the S82 Windscreen Wiper/Washer Switch.

Washer Pump Test

  1. Vehicle OFF, disconnect the harness connector at the G24 Windscreen Washer Pump.
  2. Install a 10A fused jumper wire between the control terminal 1 and 12V. Install a jumper wire between the ground terminal 2 and ground.
  3. Verify the G24 Windscreen Washer Pump is activated.
    4. ⇒If the G24 Windscreen Washer Pump does not activate, replace the G24 Windscreen Washer Pump.

Relay Test

  1. Vehicle OFF, Retained Accessory Power OFF, disconnect the harness connector X4 at the K9 Body Control Module.
  2. Test for 120-160 Ω between the control circuit terminal 14 and ground.
    3. ⇒If less than the specified value, test the control circuit for a short to ground.
    ⇒ If greater than the specified value, test the control circuit for an open/high resistance or a short to voltage.
  3. If all circuits test normal, test or replace the K9 Body Control Module.

Low Washer Fluid Switch Test

  1. Vehicle OFF, remove the B118B Windscreen Washer Fluid Level Switch.
  2. B118B Windscreen Washer Fluid Level Switch open, test for infinite resistance between the signal circuit terminal 1 and the ground terminal 2.
    3. ⇒If not the specified value, replace the B118B Windscreen Washer Fluid Level Switch.
  3. B118B Windscreen Washer Fluid Level Switch closed, test for less than 5 Ω between the signal circuit terminal 1 and the ground terminal 2.
    4. ⇒If not the specified range, replace the B118B Windshield Washer Fluid Level Switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Fuse Block Replacement
    •  Relay Replacement : Within an Electrical Center → Attached to Wire Harness
    •  Windscreen Wiper and Washer Switch Replacement
    •  Windscreen Washer Pump Replacement
    • Control Module References for BCM replacement, setup, and programming
   


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