GM Service Manual Online
For 1990-2009 cars only

Diagnostic Instructions

    â€¢ Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    â€¢ Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    â€¢  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

    â€¢ The current DTC will clear when the condition for setting the fault is no longer present.
    â€¢ 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

    â€¢  Circuit Testing
    â€¢  Connector Repairs
    â€¢  Testing for Intermittent Conditions and Poor Connections
    â€¢  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.
  4. ⇒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.
  5. 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.
  3. ⇒If the resistance is not within the specified range, replace the relay.
  4. Test for infinite resistance between the following terminals:
  5. • 30 and 86
    • 30 and 87
    • 30 and 85
    • 85 and 87
    ⇒If not the specified value, replace the relay.
  6. Test for less than 2 ohms between terminals 30 and 87A.
  7. ⇒If greater than the specified range, replace the relay.
  8. 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.
  9. ⇒If greater than the specified range, replace the Wiper LO relay.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    â€¢  Control Module References for BCM replacement, setup, and programming
    â€¢  Relay Replacement