For 1990-2009 cars

### Diagnostic Instructions

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

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

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptor

DTC B3715: Front Wiper Relay Drive Circuit

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Windshield Washer Switch Signal | 6 | 8 | 1 | --
Windshield Wiper Motor Relay Coil Supply Voltage | B3715 | 2 | 6 | --
Windshield Wiper Switch High Signal | 6 | 4 | 1 | --
Windshield Wiper Switch Low Signal | B3922 | 3 | 1 | --
Windshield Wiper Motor Park Switch Signal | 5 | 5 | -- | --
Windshield Wiper Motor High Speed Control | 2 | 4 | -- | --
Windshield Wiper Motor Low Speed Control | 2 | 3 | -- | --
Windshield Wiper Motor Ground | -- | 2 | -- | --
Windshield Wiper Switch Ground | -- | 1 | -- | --
Wiper High Speed Relay Control | 7 | 4 | B3875 | --
Wiper Relay Ground | -- | 2 | -- | --

1. Wipers and washers inoperative all modes
2. Wipers inoperative all modes and washers work
3. Delay or low speed wipers inoperative
4. High speed wipers inoperative
5. Wipers do not park.
6. Wipers always on
7. Wipers operate at high speed in the low speed mode.
8. Washer malfunction

### 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 WIPER relay from GX401.

### 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, disconnect the J2 harness connector at the engine fuse block.
2. Connect a test lamp between the control circuit terminal 25 and ground.
3. 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 for a short to ground or an open/high resistance on the control circuit. If the circuit tests normal, test or replace the body control module.

4. If all circuits test normal, test or replace the engine fuse block.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, setup, and programming