2010 Cadillac CTS Sedan AWD V6-3.6L Page 633
4. If all circuits test normal, test or replace the FRT/WSW fuse.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning)for BCM replacement, setup, and programming
B3875
DTC B3875
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B3875 00
- Wiper High Speed Relay Circuit
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) controls the wiper motor based on input from the windshield wiper washer switch. The BCM monitors the wiper
washer switch through three separate signal circuits and a ground circuit. The windshield wiper switch high signal circuit is used to determine high
speed wiper operation, the windshield wiper switch low signal is used to determine low speed, intermittent, and mist operation through the use of a
resistor ladder, and windshield washer switch signal circuit is used to determine washer operation.
The BCM controls the windshield wiper motor through two output controls, controlling two relays which determine the desired wiper speed, high
or low.
Conditions for Running the DTC
A high speed wiper request is present.
Conditions for Setting the DTC
A short to voltage is detected in the windshield wiper high speed relay control circuit.
Action Taken When the DTC Sets
