2010 Cadillac Truck SRX FWD V6-3.0L Page 707

2010 Cadillac Truck SRX FWD V6-3.0L Page 707

Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))

B3875

DTC B3715 or 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 Descriptors

DTC B3715 02

- Windshield Wiper Relay Circuit Short to Ground

DTC B3875 01

- Windshield Wiper High Speed Relay Circuit Short to Battery

DTC B3875 02

- Windshield Wiper High Speed Relay Circuit Short to Ground

DTC B3875 04

- Windshield Wiper High Speed Relay Circuit Open

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) controls the windshield wiper motor based on input from the windshield wiper/washer switch. The BCM monitors

the wiper/washer switch through two 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

* The DTC runs only when a wiper output is actively being requested by the BCM.

* The system voltage is between 9-16 V.

Conditions for Setting the DTC