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DTC B3811

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 B3811 02: Rear Washer Relay Circuit Short to Ground

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Rear Washer Switch Control

2

1

1

--

Rear Washer Relay Control

B3811 02

1

2

--

Rear Washer Fluid Pump Control

1

1

2

--

Rear Washer Fluid Pump Ground

--

1

1, 2

--

1. Rear Washer Inoperative

2. Rear Washer Always ON

Circuit/System Description

Rear Washer

When the Body Control Module detects that the Rear wiper/wash switch has activated the momentary Wash switch, it activates a High Side Drive output which supplies Battery to the coil of the Rear Washer Pump Relay. This energizes the Relay, which switches Battery Power to the Washer Pump Motor. The BCM will also activate continuous Low Speed Windshield Wipers as described above. This Washer and Wiper operation shall be continued so long as the switch remains active. Upon termination the Rear Wash Motor will be deactivated and the Wiper shall move to its Park Position and deactivate.

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 rear 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.

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 harness connector X7 at the K9 body control module.
  2. Test for 150-200 Ω between the harness connector X7 terminal 8 at the K9 body control module and ground.
    3. ⇒If less than the specified range, test the control circuit for a short to ground.
    ⇒If greater than the specified range, test the control circuit for an open/high resistance or a short to voltage.
  3. If all circuits test normal, test or replace the K9 body control module.

Component Testing

Output Control Tests

Ignition ON, command the Rear Washer ON and OFF with the rear washer switch. Observe that the KR6 rear window washer pump relay clicks and the G24 windscreen washer pump runs.

⇒If the KR6 rear window washer pump relay does not work, replace the X50A fuse block - underbonnet.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

    •  Relay Replacement : Attached to Wire Harness
    • Control Module References for BCM replacement, programming and setup
   


© Copyright Chevrolet. All rights reserved
   


© Copyright Chevrolet. All rights reserved