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DTC B3810

DTC B3810

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 B3810 02

Headlamp Washer Relay Circuit Short to Ground

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Headlamp Washer Fluid Pump Control 1 1 2 -
Headlamp Washer Relay Control B3810 02 1 2 -
Headlamp Washer Fluid Pump Ground - 1 1 -
1. Headlamp Washer Inoperative 2. Headlamp Washers Always ON


Circuit/System Description

Headlamp Washer

The Body Control Module (BCM) controls the washer motor based on an input from the windshield wiper washer switch. The BCM monitors the washer switch through the windshield washer switch signal circuit. When the WASH switch is closed, ground is supplied to the front washer switch signal circuit. When this is seen, the BCM will command the front washer fluid pump and the low speed wipers on. When Headlamp Wash Equipped, the headlamps shall be sprayed with wash fluid as a result of an extended Windshield Wash Switch Activation. In order to preserve wash fluid, the feature shall only be allowed to activate if the main beam or dipped beam is active. In addition, after the initial Headlamp Wash operation has been performed, additional headlamp washes shall not be performed for the next 4 Windshield Wash activations or for 48 hours whichever comes first.

Conditions for Running the DTC


• Ignition ON.

• The system voltage is between 9-16 V.


Conditions for Setting the DTC

A short to ground is detected in the headlamp 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.

• A history DTC will clear after 50 consecutive ignition cycles without a fault present.


Diagnostic Aids

The headlamp wash feature shall only be allowed to be activated if the main beam or dipped beam headlamps are active too.

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 diagnostic tester information

Circuit/System Verification

Operate the headlamp washer using the S82 Window Wiper/Washer Switch. Verify the G16 Headlamp Washer Fluid Pump activates. Main beam or dipped beam is ON.

Circuit/System Testing


1. Ignition OFF, disconnect the KR2 Headlamp Washer Pump Relay.

2. Test for less than 5 Ω between the ground circuit terminal 85 and ground

3. If greater than the specified range, test the ground circuit for an open/high resistance

4. Connect a test lamp between the control circuit terminal 86 and ground.

5. Ignition ON, command the headlamp washer ON and OFF using the wiper switch. The test lamp should turn ON and OFF when changing between the commanded states.

6. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the K9 Body Control Module.

7. If the test lamp is always OFF, test for a short to ground or an open/high resistance on the control circuit. If the circuit tests normal, test or replace the K9 Body Control Module.

8. If all circuits test normal, test or replace the KR2 Headlamp Washer Pump Relay.


Component Testing


Relay Test

1. Ignition OFF, connect the KR2 Headlamp Washer Pump Relay.

2. Test for 60-200 Ω between terminals 85 and 86.

3. If the resistance is not within the specified range, replace the relay.

4. Test for infinite resistance between the following terminals:

• 30 and 86

• 30 and 87

• 30 and 85

• 85 and 87

5. If not the specified value, replace the relay.

6. Test for less than 5 Ω between terminals 30 and 87A.

7. If greater than the specified range, replace the relay.

8. Install a 10 A fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 5 Ω between terminals 30 and 87.

9. If greater than specified range, replace the relay.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.


• Relay Replacement (Attached to Wiring Harness) ; Relay Replacement (In an Electrical Centre)

• Control Module References for BCM replacement, programming and setup.