Introduction:
The diagnostic trouble code (DTC) B3703 indicates a fault within the intermittent wiper delay input circuit, specifically a "High/Open" condition, as detected by the Body Control Module (BCM). This means the BCM is receiving an unexpected voltage level or no voltage at all from the circuit responsible for controlling the delay between intermittent wiper sweeps. Addressing this code promptly is essential for restoring proper wiper functionality and ensuring safe driving conditions, especially in inclement weather.
Comprehensive Table: B3703 - Intermittent Wiper Delay Input Circuit High/Open (BCM)
| Component/Aspect | Description | Possible Causes |
|---|---|---|
| BCM (Body Control Module) | The central electronic control unit responsible for managing various body functions, including the intermittent wiper system. It monitors the input signal from the wiper switch and controls the wiper motor accordingly. It interprets the resistance or voltage level coming from the wiper switch to determine the desired delay setting. | Internal BCM fault (less common, but possible). Software glitch within the BCM. Incorrect BCM programming or calibration. |
| Wiper Switch | The multi-position switch operated by the driver to control the wiper system. It provides different signals to the BCM depending on the selected wiper mode (off, low, high, intermittent). The intermittent setting often involves a variable resistor or a series of resistors that change the voltage signal sent to the BCM, dictating the delay. | Faulty wiper switch (most common). Corrosion or damage to the switch contacts. Internal short or open circuit within the switch. Incorrect wiper switch installation or adjustment. |
| Wiring Harness & Connectors | The network of wires and connectors that connect the wiper switch, BCM, and wiper motor. These wires carry the signals necessary for the wiper system to function. The connectors provide secure and reliable connections between the components. The wiring for the intermittent delay is often a single wire carrying a variable voltage signal or multiple wires representing discrete delay settings. | Open circuit in the wiring between the wiper switch and the BCM. Short circuit to ground or voltage in the wiring. Corroded or damaged connectors. Loose or disconnected connectors. Wire chafing or insulation damage leading to intermittent connection. |
| Intermittent Wiper Relay | Some vehicles utilize a relay to control the power supply to the wiper motor during intermittent operation. The BCM triggers the relay to activate the wiper motor for a short period, followed by a delay. This relay is often separate from the low and high-speed wiper relays. | Faulty intermittent wiper relay. Relay contacts stuck open or closed. Relay coil failure. Wiring issue affecting the relay control circuit. |
| Ground Connections | A secure and reliable ground connection is essential for all electrical components to function correctly. Poor ground connections can cause erratic behavior and false error codes. The BCM and wiper switch both require good ground connections. | Corroded or loose ground connections. Ground wire damage or breakage. Insufficient grounding of the BCM or wiper switch. |
| Scan Tool Data | Examining the BCM data stream using a diagnostic scan tool can provide valuable information about the wiper switch input signal. The scan tool can display the voltage level or resistance value being reported by the wiper switch to the BCM. | Incorrect or missing scan tool readings for the wiper switch input. Inability to communicate with the BCM. Faulty scan tool. |
| Circuit Testing | Using a multimeter or oscilloscope to test the voltage and continuity of the wiring and components in the intermittent wiper circuit can help pinpoint the source of the problem. Testing should be performed with the ignition on and the wiper switch in the intermittent position. | Incorrect voltage or resistance readings. Open circuit or short circuit detected in the wiring. No signal detected from the wiper switch. |
| Related DTCs | Other DTCs related to the wiper system (e.g., wiper motor circuit faults, low/high-speed wiper malfunctions) can provide clues about the underlying cause of the B3703 code. Addressing other related codes might resolve the B3703 code as well. | The presence of other wiper-related DTCs. Intermittent wiper operation issues beyond the delay function. |
| Environmental Factors | Extreme temperatures, humidity, and exposure to corrosive substances can accelerate the deterioration of wiring and connectors, leading to electrical faults. Water intrusion into the BCM or wiper switch can also cause problems. | Corrosion due to salt or water exposure. Damage from extreme heat or cold. Water intrusion into electrical components. |
Detailed Explanations:
BCM (Body Control Module): The BCM is the brain of the vehicle's body electrical system. It receives input from various sensors and switches, including the wiper switch, and controls outputs such as the wiper motor, lights, and door locks. For the intermittent wiper system, the BCM monitors the signal from the wiper switch, which indicates the desired delay setting. If the BCM detects a voltage level that is unexpectedly high or absent (open circuit) on the intermittent wiper delay input circuit, it will set the B3703 code. A faulty BCM is less common than other causes, but it should be considered after other possibilities have been ruled out.
Wiper Switch: The wiper switch is the driver's interface for controlling the wiper system. It typically has multiple positions, including off, low, high, and intermittent. The intermittent setting often uses a variable resistor or a series of resistors within the switch to provide different delay settings. The resistance changes the voltage signal sent to the BCM, telling it how long to wait between wiper sweeps. A malfunctioning wiper switch is a common cause of the B3703 code.
Wiring Harness & Connectors: The wiring harness and connectors provide the electrical pathways between the various components of the wiper system. Any damage or corrosion to the wiring or connectors can disrupt the signal flow and cause problems. An open circuit (broken wire) or a short circuit (wire touching ground or another voltage source) in the intermittent wiper delay input circuit can trigger the B3703 code. Thoroughly inspect the wiring and connectors for any signs of damage, corrosion, or loose connections.
Intermittent Wiper Relay: In some vehicles, an intermittent wiper relay is used to control the power supply to the wiper motor during intermittent operation. The BCM sends a signal to the relay, which then activates the wiper motor for a short period, followed by a delay. A faulty relay can prevent the wiper motor from operating correctly during intermittent mode and may contribute to the B3703 code. Check the relay for proper operation and replace it if necessary.
Ground Connections: A good ground connection is essential for all electrical components to function correctly. Poor ground connections can cause erratic behavior and false error codes. The BCM and wiper switch both require good ground connections to operate properly. Locate the ground connections for the BCM and wiper switch, and ensure they are clean, tight, and free from corrosion.
Scan Tool Data: A diagnostic scan tool can be used to read the BCM data stream and monitor the wiper switch input signal. This can provide valuable information about the voltage level or resistance value being reported by the wiper switch to the BCM. Compare the scan tool readings to the expected values to identify any discrepancies. If the scan tool shows an incorrect or missing signal, it can help pinpoint the source of the problem.
Circuit Testing: Using a multimeter or oscilloscope to test the voltage and continuity of the wiring and components in the intermittent wiper circuit can help pinpoint the source of the problem. Test the voltage at the wiper switch connector and the BCM connector with the ignition on and the wiper switch in the intermittent position. Also, check the continuity of the wiring between the wiper switch and the BCM to ensure there are no open circuits.
Related DTCs: If other DTCs related to the wiper system are present, they can provide clues about the underlying cause of the B3703 code. For example, if there is a DTC related to the wiper motor circuit, it may indicate a problem with the wiper motor or its wiring, which could also affect the intermittent wiper function. Addressing other related codes might resolve the B3703 code as well.
Environmental Factors: Environmental factors such as extreme temperatures, humidity, and exposure to corrosive substances can accelerate the deterioration of wiring and connectors, leading to electrical faults. Water intrusion into the BCM or wiper switch can also cause problems. If the vehicle has been exposed to harsh environmental conditions, inspect the wiring and connectors for signs of corrosion or damage.
Frequently Asked Questions:
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What does the B3703 code mean? The B3703 code indicates a high or open circuit in the intermittent wiper delay input circuit, as detected by the BCM.
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What are the symptoms of a B3703 code? The most common symptom is the intermittent wipers not working correctly, or not working at all.
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What are the common causes of the B3703 code? Common causes include a faulty wiper switch, wiring problems, or a faulty BCM.
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Can I fix the B3703 code myself? Depending on your mechanical skills, you may be able to diagnose and fix the problem yourself by checking the wiring, switch, and ground connections. However, BCM issues might require professional diagnosis and programming.
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How much does it cost to fix the B3703 code? The cost to fix the B3703 code varies depending on the cause of the problem. Replacing a wiper switch is typically less expensive than replacing a BCM.
Conclusion:
The B3703 code signifies a problem with the intermittent wiper delay input circuit, usually involving a high or open circuit condition. Diagnosing and resolving this code requires a systematic approach, including checking the wiper switch, wiring, connectors, ground connections, and potentially the BCM. Addressing the issue promptly ensures the proper functioning of the intermittent wipers and enhances driving safety in adverse weather conditions.