B3810

DTC B3810 or B3811

Diagnostic Instructions

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

DTC Descriptor

DTC B3810
- Headlamp Washer Relay Circuit

DTC B3811
- Rear Washer Relay Circuit

Circuit/System Description

Battery positive voltage is supplied to the coil and switch sides of the rear washer and headlamp washer relays. The body control module (BCM) energizes a relay by grounding the relay coil through the relay control circuit. When a relay is energized, the relay switch is closed and battery positive voltage is supplied to the washer pump control circuit.

Conditions for Running the DTC

The battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

B3810

The headlamp washer relay control circuit is shorted to ground or open while the relay is de-energized, or shorted to B+ while the relay is energized.

B3811

The rear washer relay control circuit is shorted to ground or open while the relay is de-energized, or shorted to B+ while the relay is energized.

Action Taken When the DTC Sets

* The DTC will be current for as long as the fault is present.
* The headlamp washers will be disabled for as long as the B3810 is current.
* The rear washers will be disabled for as long as the B3811 is current.

Conditions for Clearing the DTC

* This DTC will clear on current status after the condition for setting the fault is corrected.
* A history DTC will clear after 50 consecutive ignition cycles without a fault present.

Circuit/System Testing

1. Ignition OFF, disconnect the affected relay.
2. Verify that a test lamp illuminates between the B+ circuit terminal 85 and ground.

^ If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the washer pump control circuit terminal 30 for a short to ground. If the circuit tests normal, test or replace the affected relay.

3. Connect a test lamp between the B+ circuit terminal 85 and the relay control circuit terminal 86.
4. Command the affected washer pump ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

^ If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.

^ 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 BCM.

5. If all circuits test normal, test or replace the affected relay.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Relay Replacement (Attached to Wire Harness) Relay Replacement (Within an Electrical Center)