Buick Regal: DTC B371A
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 B371A 39
Windshield Wiper Motor Internal Malfunction
Circuit/System Description
B+ voltage and ground are supplied to the windshield wiper motor. Whenever the vehicle is ON or in Service Mode, the body control module (BCM) sends the wiper/washer switch status through the LIN communication bus. If a fault occurs at any time in the windshield wiper motor, the BCM will set the DTC.
Conditions for Running the DTC
The BCM runs the diagnostic to detect an internal fault when power up is commanded. The only requirements are voltage and ground. This diagnostic runs even if the voltage is out of the valid operating range.
Conditions for Setting the DTC
The BCM receives an invalid signal from the windshield wiper motor.
Action Taken When the DTC Sets
The BCM ignores all additional inputs.
Conditions for Clearing the DTC
A current DTC clears when the diagnostic runs and passes.
Reference Information
Schematic Reference
Wiper/Washer Wiring Schematics
Connector End View Reference
COMPONENT CONNECTOR END VIEWS - INDEX
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
1. Vehicle in Service Mode.
2. Verify that there is no communications DTC set.
- If there is a communications DTC set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle.
- Go to next step: If there is no communications DTC set
3. Verify that DTC B371A is not set.
- If DTC B371A is set
Replace the M75 Windshield Wiper Motor.
- Go to next step: If DTC B371A is not set
4. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
- Windshield Wiper Motor Replacement
READ NEXT:
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.
Diag
Symptoms - Wiper/Washer Systems
NOTE: The following steps must be completed before using the symptom
tables:
1. Perform Diagnostic System Check - Vehicle , in order to verify that all of
the following conditions are true:
No DTC
Low Washer Fluid Indicator 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.
Diag
SEE MORE:
Engine Coolant Thermostat Housing Inlet Pipe Replacement (3.6L LGX)
Removal Procedure
1. Drain the cooling system.
2. Engine Rear Noise Shield - Remove.
3.
Radiator Inlet Hose Clamp (1) - Disengage.
4. Radiator Inlet Hose (2) - Disconnect.
5. Engine Coolant Thermostat Housing Inlet Pipe Bolt (3) - Remove.
6.
Engine Coolant Thermostat Housing Inlet Pipe (1) -
Description and Operation
REAR SUSPENSION DESCRIPTION AND OPERATION
The rear suspension system on this vehicle is of the independent link type.
Rear suspension adjustment is achieved
through adjustable toe links and lower control arms. The rear coil springs are
retained between the body and the
lower control arm. Rubber in
