GM Service Manual Online
For 1990-2009 cars only

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

Windshield Washer Switch Signal

6

8

8

1

--

Windshield Wiper Motor Relay Coil Supply Voltage

B3715 00

2

6

--

Windshield Wiper Switch High Signal

6

4

1

--

Windshield Wiper Switch Low Signal

B3922 00

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 00

--

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 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.

Reference Information

Schematic Reference

Wiper/Washer Schematics

Connector End View Reference

Wiper/Washer Connector End Views

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

    •  Scan Tool Output Controls
    •  Scan Tool Data List
    •  Scan Tool Data Definitions

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.
  3. If greater than 5 ohms, test the ground circuit for an open/high resistance.
  4. Connect a test lamp between the wiper relay control circuit terminal 85 and ground.
  5. 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.
  6. 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 BCM.
    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 BCM.
  7. If all circuits test normal, test or replace the WPR relay.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, programming and setup