B3715

DTC B3715

DTC DESCRIPTOR

DTC B3715 00




Front Wiper Relay Drive Circuit

DIAGNOSTIC FAULT INFORMATION
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview

CIRCUIT/SYSTEM DESCRIPTION
The body control module (BCM) monitors the control circuit of the wiper 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 WIPER Relay. Ground is supplied at all times to the coil side of the WPR Relay from G104.

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.

CIRCUIT/SYSTEM TESTING
1. Ignition OFF, remove the WPR Relay from the underhood fuse block.
2. Test for less than 5 ohms of resistance between the ground circuit terminal 86 and ground.
- If greater than 5 ohms, test the ground circuit for an open/high resistance.
3. Connect a test lamp between the wiper relay control circuit terminal 85 and ground.
4. Ignition ON, command the Wiper Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
- If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the body control module.
- If the test lamp is always OFF, test the control circuit for a short to ground. If the circuit tests normal, test or replace the body control module.
5. If all circuits test normal, test or replace the WPR relay.

REPAIR INSTRUCTIONS
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
Control Module References for BCM replacement, programming and setup. Programming and Relearning