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DTC B3873

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.

DTC Descriptors

DTC B3873 01: Front Washer Relay Circuit Short to Battery

DTC B3873 02: Front Washer Relay Circuit Short to Ground

DTC B3873 04: Front Washer Relay Circuit Open Circuit

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Windscreen Washer Switch Signal

2

1

1

--

Windscreen Washer Fluid Pump Control

1

1

2

--

Windscreen Washer Relay Control

B3873 02, 1

B3873 04, 1

B3873 01, 2

-

Windscreen Washer Fluid Pump Ground

--

1

1

--

1. Washer Inoperative

2. Washer Always ON

Circuit/System Description

The body control module (BCM) controls the windscreen washer fluid pump based on an input from the windscreen 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.

Conditions for Running the DTC
    • Ignition ON.
    • The system voltage is between 9–16 V.

Conditions for Setting the DTC
    • A short to ground or an open/high resistance is detected in the windscreen washer relay control circuit.
    • A short to voltage is detected in the windscreen washer relay control circuit.

Action Taken When the DTC Sets

Washer operation is suspended.

Conditions for Clearing the DTC

A current DTC clears when the diagnostic runs and passes.

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 Testing

  1. Ignition OFF, disconnect the X2 harness connector at the X50A underbonnet fuse block.
  2. Connect a test lamp between the control circuit terminal 60 and ground.
  3. Ignition ON, 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 an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  4. Ignition OFF, connect the X2 harness at the X50A underhood fuse block and disconnect the harness connector at the G24 windshield 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. Ignition ON, 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.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

    •  Front Compartment Fuse Block Housing Replacement
    •  Windscreen Washer Pump Replacement
    • Control Module References for BCM replacement, programming and setup
   


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