B3715

DTC B3715

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 B3715 02
- Front Wiper Relay Control Circuit Short to Ground

Diagnostic Fault Information






Circuit/System Description

The body control module (BCM) monitors the control circuit of the WIPER PCB Relay. The voltage level should be low while the wiper relay is de-energized and near system voltage when the relay is energized. After the BCM receives a low, intermittent, or mist signal from the wiper/washer switch, it responds by applying battery voltage through the wiper relay control circuit to the coil side of the relay, energizing the relay. Ground is supplied at all times to the coil side of the WIPER relay from G200.

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

If the BCM detects a short to ground in the wiper 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 and all vehicle systems OFF, disconnect the X2 harness connector at the X50A underhood fuse block, ignition ON. It may take up to 2 minutes for all vehicle systems to power down.

2. Test for less than 10 ohms between the ground circuit terminal B1 and ground.

• If greater than 10 ohms

1. Test for less than 2 ohms in the ground circuit end to end.

• If greater than 2 ohms, 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

3. Connect a test lamp between the control circuit terminal A1 and ground.

4. Verify the test lamp turns ON and OFF while commanding the Wiper Relay ON and OFF with a scan tool.

• If test lamp always OFF

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

3. Test for less than 2 ohms in the control circuit end to end.

• If greater than 2 ohms, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K9 body control module.

• If test lamp always ON

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

• If test lamp turns ON and OFF

5. 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