B3875

DTC B3875

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B3875 02
- Wiper High Speed Control Relay Short to Ground

DTC B3875 01
- Wiper High Speed Control Relay Short to Voltage

Diagnostic Fault Information






Circuit/System Description

The body control module (BCM) monitors the wiper high speed relay control circuit only when wiper high speed mode is active. When the wiper high speed mode is requested, the BCM responds by applying a ground through the wiper high speed relay control circuit to the coil side of the relay, energizing the wiper high relay.

Conditions for Running the DTC

This DTC can set only when the output is actively being requested by the BCM.

Conditions for Setting the DTC

This DTC sets if the BCM detects a short to battery voltage in the wiper high speed relay control circuit.

Action Taken When the DTC Sets

The BCM will not activate the output.

Conditions for Clearing the DTC

* The current DTC will become history when the request for the output is removed or when the condition for setting the fault is corrected.

* The history DTC will clear after 50 consecutive ignition cycles without a fault present.

Reference Information

Schematic Reference

Wiper/Washer Schematics Electrical Diagrams

Connector End View Reference

Component Connector End Views A/C Compressor Clutch

Description and Operation

Wiper/Washer System Description and Operation Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for Scan Tool Information

Circuit/System Testing

1. Ignition OFF, disconnect the X2 harness connector at the underhood fuse block, ignition ON.

2. Connect a test lamp between the control circuit terminal C1 and battery voltage.

3. Verify the test lamp turns ON and OFF when commanding the Wiper High Speed Wiper ON and OFF with a scan tool.

• If test lamp is always OFF

1. Ignition OFF, remove the X5 harness connector from the K9 body control module, ignition ON.

2. Test for less than 1 V between the control circuit and ground.

• If greater than 1 V, repair the short to voltage in the circuit.

• If less than 1 V

3. Ignition OFF.

4. 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 K9 body control module.

• If test lamp is always ON

1. Ignition OFF, disconnect the X5 harness connector at the K9 body control module.

2. Test for infinite resistance between the control circuit and ground.

• If less than infinite resistance, repair the short to ground in the circuit.

• If infinite resistance, replace the K9 body control module.

• If test lamp turns ON and OFF

4. Test or replace the underhood fuse block.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Accessory Wiring Junction Block Replacement Accessory Wiring Junction Block Replacement

* Control Module References Control Module References for BCM replacement, setup, and programming