Chevrolet Trax: Rear washer system malfunction
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
Rear Washer Relay Circuit
For symptom byte information, refer to Symptom Byte List .
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) controls the rear washer based on an input from
the rear wiper switch, which
is part of the windshield wiper/washer switch. The BCM monitors the windshield
wiper/washer switch through
two separate signal circuits and a low reference circuit. The rear wiper switch
uses a resistor ladder to determine
low speed, intermittent, and rear washer operation. The BCM monitors applies and
monitors voltage on the rear
wiper switch signal circuit. When the rear wiper switch is placed in the low
speed, intermittent, or rear washer
position, the voltage is pulled down through a different resistor in the
resistor ladder, reducing the voltage seen
at the BCM. The BCM will respond by commanding the specific rear wiper function.
The windshield washer uses a single windshield washer pump to provide fluid for
both the front and rear
washers. Changing the polarity of the motor will cause it to spin in opposite
directions, feeding fluid to the front
or rear. When rear washers are requested, the BCM applies voltage to the rear
window washer pump relay
control circuit. This causes the contacts in the rear washer pump relay to close
and supplies voltage to the
windshield washer pump. Ground for the windshield washer pump is provided
through the windshield washer
pump relay, which is switched to ground in it's at-rest state.
Conditions for Running the DTC
- Ignition ON
- The system voltage is between 9-16 V
Conditions for Setting the DTC
B3811 01
A short to voltage has been detected on the rear window washer pump relay
control circuit
B3811 04
A open/high resistance has been detected on the rear window washer pump relay
control circuit
Action Taken When the DTC Sets
Rear washer operation is disabled.
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 rear liftgate must be closed in order for the rear wiper to work
Reference Information
Schematic Reference
Wiper/Washer Schematics (Encore), Wiper/Washer Schematics (Trax)
Connector End View Reference
WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS -
INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT
CONNECTOR END VIEWS - INDEX - TRAX
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 Verification
- Ignition ON.
- Verify the Scan Tool Rear Closure Ajar Switch Parameter changes between
Inactive and Active when
Opening and closing the liftgate.
- If the parameter does not change
Refer to Door Ajar Indicator Malfunction
- Verify the scan tool Rear Wiper Switch parameter changes between On and
Off when cycling the rear
wiper switch ON and OFF.
- If the parameter does not change
Refer to Rear Wiper System Malfunction
- Verify the G24 Windshield Washer Pump turns on and off when commanding
the rear washers OFF and
ON with the rear washer switch
- If the Rear Window Washers do not turn ON
Refer to Circuit/System Testing
- If the Rear Window Washers turn ON
- All OK.
Circuit/System Testing
- Ignition OFF, and all vehicle systems OFF. Disconnect the X2 harness
connector at the X50A Fuse Block
- Underhood. It may take up to 2 min for all vehicle systems to power down.
- Test for less than 10 ohms between the ground circuit terminal C5 and
ground:
- Test for less than 2 ohms in the ground circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, repair the open/high resistance in the ground
connection.
- If less than 10 ohms
- Connect the X2 harness connector and disconnect the X1 harness connector
at the X50A Fuse Block -
Underhood.
- Test for infinite resistance between each of the control circuit
terminals listed below and ground
- Terminal G3
- Terminal H3
- If less than Infinite resistance
Repair the short to ground on the circuit.
- Connect the X1 harness connector at the X50A Fuse Block - Underhood.
Disconnect the harness
connector at the G24 Windshield Washer Pump, ignition ON.
- Test for less than 1 V between the control circuit terminals listed
below and ground:
- Terminal 1
- Terminal 2
- If 1 V or greater
- Ignition OFF, disconnect the X1 harness connector at the X50A Fuse Block
- Underhood.
- Test for less than 1 V between the control circuit and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, test or replace the X50A Fuse Block - Underhood.
- If less than 1 V
- Ignition OFF, and all vehicle systems OFF. It may take up to 2 min for
all vehicle systems to power
down.
- Test for less than 10 ohms between the control circuit terminal 1 and
ground.
- Ignition OFF, disconnect the X1 harness connectors at the X50A Fuse
Block - Underhood.
- Test for less than 2 ohms in the control circuit end to end:
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the X50A Fuse Block - Underhood.
- If less than 10 ohms
- Test for less than 10 ohms between the control circuit terminal 2 and
ground.
- Ignition OFF, disconnect the X1 harness connectors at the X50A Fuse
Block - Underhood.
- Test for less than 2 ohms in the control circuit end to end:
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the X50A Fuse Block - Underhood.
- If less than 10 ohms
- Connect a test lamp between the control circuit terminal 1 and the
control circuit terminal 2, ignition ON.
- Verify the test lamp does NOT turn ON and OFF when commanding the rear
washer ON and OFF with
the rear washer switch.
- If the test lamp turns ON and OFF
Test or replace the G24 Windshield Washer Pump.
- If the test lamp does not turn ON and OFF
- Ignition OFF, connect the harness connector at the G24 Windshield Washer
Pump. Disconnect the X2
harness connector at the X50A Fuse Block - Underhood, ignition ON.
- Connect a test lamp between the control circuit terminal G2 and ground.
- Verify the test lamp turns ON and OFF when commanding the rear washer ON
and OFF with the rear
washer switch.
- If the test lamp is always OFF
- Ignition OFF, remove the test lamp. Disconnect the X1 harness connector
at the K9 Body Control
Module.
- Test for infinite resistance between the control circuit and ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance.
- Test for less than 2 ohms in the control circuit end to end.
- If 2 ohms or greater, repair the short to ground on the circuit.
- If less than 2 ohms, replace the K9 Body Control Module
- If the test lamp is always ON
- Ignition OFF, remove the test lamp. Disconnect the X1 harness connector
at the K9 Body Control
Module, ignition ON.
- Test for less than 1 V between the control circuit and ground.
- If 2 ohms or greater, repair the short to voltage on the circuit
- If less than 2 ohms, replace the K9 Body Control Module
- If the test lamp turns ON and OFF.
- Test or replace the X50A Fuse Block - Underhood.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Windshield Washer Pump Replacement
- Front Compartment Fuse Block Replacement
- Windshield Wiper and Washer Switch Replacement (Encore), Windshield
Wiper and Washer
Switch Replacement (Trax)
- Control Module References for body control module replacement,
programming, and setup.
WIPER BLADE ELEMENT CHECK
Fig. 7: Identifying Wiper Blade Element
- Remove the wiper blades from the wiper arms. Refer to Windshield Wiper
Blade Replacement.
- Look down the length of the blade element.
- Replace the wiper blade element if the rubber element which contacts the
glass is not on the centerline of
the blade +/-15 degrees.
- Install the wiper blades on the wiper arms. Refer to Windshield Wiper
Blade Replacement.
READ NEXT:
WINDSHIELD WIPER AND WASHER SWITCH REPLACEMENT (ENCORE)
Fig. 8: Windshield Wiper And Washer Switch
Windshield Wiper and Washer Switch Replacement (Encore)
WINDSHIELD WIPER AND WASHER SWITCH REPLAC
WIPER/WASHER SYSTEM DESCRIPTION AND OPERATION
Wiper/Washer System Components
The wiper/washer system consists of the following electrical components:
Windshield Wiper Relay
Windshield Wiper Speed C
Schematic and routing diagrams
THEFT DETERRENT SYSTEM SCHEMATICS (ENCORE)
Theft Deterrent System
Fig. 1: Theft Deterrent System
THEFT DETERRENT SYSTEM SCHEMATICS (TRAX)
Theft Deterrent System
Fig.
SEE MORE:
Removal Procedure
WARNING: Refer to Brake Fluid Irritant Warning .
CAUTION: Refer to Brake Fluid Effects on Paint and Electrical
Components Caution
Remove the battery. Refer to Battery Replacement .
Fig. 67: Master Cylinder Primary Brake Pipe Fitting
Disconnect the brake pressure modulator v
Throttle Positions
Engine Braking
A condition where the engine is used to slow the vehicle by manually
downshifting during a zero throttle
coastdown.
Full Throttle Downshift
A quick apply of the accelerator pedal to its full travel, forcing a
downshift.
Heavy Throttle
Approximately 3/4 of accelera