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 00: Front Wiper Relay Drive Circuit

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
BCM Fuse F9 B+ | B3794 00 B1529 00 B3922 00 | B3794 00 B1529 00 B3922 00 | -- | --
FRT WPR Fuse B+ | 1 | 1 | -- | --
Windshield Wiper Switch Signal | B3922 00 | 1 | 1 | --
Windshield Wiper Switch High Signal | 3 | 1 | 1 | --
Windshield Wiper Motor Park Switch Signal | 2 | 2 | -- | --
WIPER LO Relay Control | B3715 00 | 1 | 3 | --
WIPER HIGH Relay Control | 1 | 1 | B3875 00 | --
Windshield Wiper Motor High Speed Control | 1 | 1 | 1 | --
Windshield Wiper Motor Low Speed Control | 1 | 1 | 1 | --
Windshield Wiper Switch Low Reference | -- | 1 | 1 | --
Windshield Wiper Motor Ground | -- | 1 | -- | --
WIPER CONTROL Relay Ground | -- | 1 | -- | --
1.Windshield wiper system malfunction 2. Wipers Do Not Park 3. Wipers Always ON

### 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.

### Conditions for Running the DTC

The BCM output is actively being requested.

### Conditions for Setting the DTC

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 clear when the condition for setting the fault is no longer present.

• | The history DTC will clear after 100 consecutive ignition cycles without a fault present.

### Reference Information

#### Schematic Reference

Wiper/Washer Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Wiper/Washer System Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Testing

1. Ignition OFF, disconnect the WIPER LO Relay.
2. Connect a test lamp between the control circuit terminal 85 and ground circuit terminal 86.
3. Ignition ON, command the low speed wipers 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, replace the BCM.

⇒ | 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, replace the BCM.

4. If all circuits test normal, test or replace the WIPER LO Relay.

### Component Testing

1. Ignition OFF, disconnect the Wiper LO Relay.
2. Test for 60-200 ohms between terminals 85 and 86.

⇒ | If the resistance is not within the specified range, replace the relay.

3. Test for infinite resistance between the following terminals:

• | 30 and 86

• | 30 and 87

• | 30 and 85

• | 85 and 87

⇒ | If not the specified value, replace the relay.

4. Test for less than 2 ohms between terminals 30 and 87A.

⇒ | If greater than the specified range, replace the relay.

5. Install a 10A fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.

⇒ | If greater than the specified range, replace the Wiper LO relay.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Control Module References for BCM replacement, setup, and programming

• | Relay Replacement