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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 Descriptor

DTC B3873:  Front Washer Relay Circuit

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Windscreen Washer Switch Signal

2

1

3

--

Windscreen Washer Pump Control

1

1

2

--

Windscreen Washer Relay Control

2

1

B3873

-

Windscreen Washer Pump Ground

--

1

--

--

Windscreen Wiper Switch Ground

--

3

--

--

  1. Washer Inoperative
  2. Washers Always ON
  3. Windscreen Wiper System Malfunction

Circuit/System Description

The windscreen washer function is controlled by the body control module (BCM). When the washer switch is pressed, ground is applied through the switch contacts and the signal circuit to the BCM indicating the wash request. The BCM then applies ground through the control circuit to the coil side of the Front Washer Pump Relay energising the relay. With the relay energised, battery voltage from the Ef2 and the F3 fuse is applied through the switch contacts of the relay and the control circuit to the windscreen washer fluid pump.

Conditions for Running the DTC

This DTC can set only when the output is actively being requested by the BCM.

Conditions for Setting the DTC

This DTC sets if the BCM detects a short to battery voltage in the wiper high speed relay control circuit.

Action Taken When the DTC Sets

The BCM will not activate the output.

Conditions for Clearing the DTC
    • The current DTC will become history when the request for the output is removed or when the condition for setting the fault is corrected.
    • The history DTC will clear after 50 consecutive ignition cycles without a fault present.

Circuit/System Testing
  1. Ignition OFF, disconnect the J2 wiring harness plug at the IP fuse block.
  2. Connect a test lamp between the control circuit terminal 43 and battery voltage.
  3. Command the Wiper Washer Motor 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 ground. If the circuit tests normal, replace the body control module.
    ⇒If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the body control module.
  4. If all circuits test normal, test or replace the engine fuse block.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, setup, and programming

   


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