Workshop Manuals Factory service & repair Vauxhall
Vauxhall Astra J05 · Body Systems
05 · Body & interior

DTC B3811

Make
Vauxhall
Model
Astra J
Section
Wipers and Washers › Other Information › DTC B3811
Body SystemsDTC B3811

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 (BCM) detects that the rear wiper/wash switch has activated the momentary wash switch, it activates a high side drive output which supplies battery voltage 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


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

1. Ignition OFF, Retained Accessory Power OFF, disconnect the harness connector X5 at the K9 body control module.
2. Test for 120-160 Ω between control terminal 9 and ground.
⇒ If less than the specified value, test the control circuit for a short to ground.
⇒ If greater than the specified value, 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 Test

1. Ignition ON, command the Rear Washer Relay Command On and OFF with a scan tool.
2. Observe the KR6 rear window washer pump relay activates and the G24 windshield washer pump runs.
⇒ If the KR6 rear window washer pump relay does not work, replace the X50A underhood fuse block.
⇒ If the KR6 rear window washer pump relay works but the G24 windshield washer pump does not work, test the KR11 windshield washer pump relay and the G24 windshield washer pump.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

•  Control Module References for BCM replacement, programming and setup

Parts & tools for this job For Vauxhall Astra

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