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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

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

2

-

Windscreen Washer Fluid Pump Ground

--

1

1

--

1. Front Washer Inoperative

2. Front Washer Always ON

Circuit/System Description

The body control module (BCM) controls the windscreen washer fluid pump based on an input from the indicator/multifunction 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 front 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
    • Vehicle in Service Mode
    • 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. Vehicle OFF, Retained Accessory Power OFF, disconnect the harness connector X4 at the K9 Body Control Module.
  2. Test for 120-160 Ω between control terminal 14 and ground.
    3. ⇒If less than the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the X50A under-bonnet fuse block.
    ⇒ If greater than the specified value, test the control circuit for an open/high resistance or a short to voltage. If the circuit tests normal, replace the X50A under-bonnet fuse block.
  3. If all circuits test normal, test or replace the K9 Body Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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


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