vauxhall Workshop Repair Guides

Vauxhall Workshop Service and Repair Manuals

ABOUT US
Symptoms - Wiper/Washer Systems > < DTC B371A

Astra J

DTC B3715

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 Descriptors

DTC B3715 01:  Windscreen Wiper Relay Circuit Short to Battery

DTC B3715 02:  Windscreen Wiper Relay Circuit Short to Ground

DTC B3715 04:  Windscreen Wiper Relay Circuit Open

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Windscreen Wiper High Speed Relay B+

1, 2

1, 2

--

--

Windscreen Wiper Switch Low Signal

1

1

1

--

Windscreen Wiper Motor Park Switch Signal

4

2

2

--

Front Wiper Relay Control

3

3

--

--

Windscreen Wiper High Control

B3715 02

B3715 04

B3715 01

-

Speed Relay Control

1, 2

1, 2

2

--

Windscreen Wiper High Speed Relay Control

2

2

4

--

Front Wiper Motor Low Speed Control

1

1

4

--

Windscreen Wiper Switch Low Reference

--

1, 2

1, 2

--

Windscreen Wiper Motor Ground

--

1, 2, 3

--

--

Front Wiper Relay Ground

--

1

--

--

1. Delay or Low Speed Wipers Inoperative

2. High Speed Wipers Inoperative

3. Wipers Do Not Park

4. Wipers Always ON

Circuit/System Description

The Body Control Module (BCM) controls the windscreen wiper motor based on input from the windscreen wiper/washer switch. The BCM monitors the wiper/washer switch through two separate signal circuits and a ground circuit. The windscreen wiper switch high signal circuit is used to determine high speed wiper operation, the windscreen wiper switch low signal is used to determine low speed, intermittent, and mist operation through the use of a resistor ladder, and windscreen washer switch signal circuit is used to determine washer operation.

The BCM controls the windscreen wiper motor through two output controls, controlling two relays which determine the desired wiper speed, high or low.

Conditions for Running the DTC

    •  The DTC runs only when a wiper output is actively being requested by the BCM.
    •  The system voltage is between 9–16 V.

Conditions for Setting the DTC

    •  A short to voltage is detected in the Front Wiper Relay control circuit or in the High Speed Relay control circuit.
    •  A short to ground or an open/high resistance is detected in the Front Wiper Relay control circuit or in the High Speed Relay control circuit.

Action Taken When the DTC Sets

The BCM will not activate the wiper output.

Conditions for Clearing the DTC

    •  A current DTC will clear when the condition for setting the fault is no longer seen.
    •  A history DTC will clear after 50 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
    •  Wiring Repairs


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

  1. Ignition OFF, disconnect the KR12B Windscreen Wiper Relay.
  2. Connect a test lamp between the control circuit terminal 86 and ground.
  3. Ignition ON, command the low speed wipers ON and OFF using the S82 Windscreen Wiper/Washer Switch. 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 K9 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, replace the K9 Body Control Module.
  4. If all circuits test normal, test or replace the KR12B Windscreen Wiper Relay.

Component Testing

Relay Test

  1. Ignition OFF, disconnect the KR12B Windscreen Wiper Relay.
  2. Test for 60-200 Ω between terminal 85 and 86.
    3. ⇒ If the resistance is not within the specified range, replace the KR12B Windscreen Wiper Relay.
  3. Test for infinite resistance between the following terminals:
    4. •  30 and 86
    •  30 and 87
    •  30 and 85
    •  85 and 87
         ⇒ If not the specified value, replace the KR12B Windscreen Wiper Relay.
  4. Test for less than 5 Ω between terminals 30 and 87A.
    5. ⇒ If greater than the specified value, replace the KR12B Windscreen Wiper Relay.
  5. Install a 10 A fused jumper wire between relay terminal 85 and B+. Install a jumper wire between relay terminal 86 and ground. Test for less than 5 Ω between terminals 30 and 87.
    6. ⇒ If greater than the specified range, replace the KR12B Windscreen Wiper Relay.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Relay Replacement
    •  Control Module References for BCM replacement, setup and programming

Symptoms - Wiper/Washer Systems > < DTC B371A