Introduction
The B1619 diagnostic trouble code (DTC) indicates a malfunction in the rear wiper system of a vehicle, specifically concerning the low limit input circuit. This circuit is crucial for the proper operation of the rear wiper, as it signals the control module when the wiper blade has returned to its designated "park" or resting position. A failure in this circuit can lead to several issues, including the rear wiper not functioning correctly, running continuously, or failing to park in the correct position. This article will delve into the causes, symptoms, diagnosis, and potential solutions for a B1619 code, providing a comprehensive guide for understanding and addressing this issue.
Table: B1619 Wiper Rear Low Limit Input Circuit Failure - Causes, Symptoms, and Solutions
| Category | Description | Potential Solutions |
|---|---|---|
| Causes | ||
| Wiring Problems | Damaged, corroded, or disconnected wiring in the rear wiper low limit circuit. This includes the wiring harness, connectors, and associated grounds. | Inspect and repair or replace damaged wiring, connectors, and grounds. Clean corroded connections and ensure proper grounding. Use a multimeter to check for continuity and voltage. |
| Faulty Wiper Motor | The rear wiper motor itself may have an internal fault that affects the low limit switch or its associated circuitry. | Test the wiper motor using a multimeter or scan tool. If the motor is faulty, replace it with a new or remanufactured unit. |
| Defective Switch | The low limit switch integrated into the wiper motor or wiring harness might be malfunctioning, failing to send the correct signal to the control module. | Test the low limit switch for proper operation using a multimeter. Replace the switch if it is defective. In some cases, the switch is integrated into the wiper motor and requires motor replacement. |
| Control Module Issue | The body control module (BCM) or other relevant control module responsible for managing the rear wiper system could be faulty. This is less common but possible. | Diagnose the control module using a scan tool. Check for other related codes and module communication issues. If the module is faulty, it may need to be reprogrammed or replaced. |
| Symptoms | ||
| Wiper Malfunction | The rear wiper may not operate at all, may run continuously, or may not stop in the correct "parked" position. It might also exhibit erratic or intermittent behavior. | This symptom is directly related to the low limit switch not signaling the control module correctly. Address the underlying cause (wiring, motor, switch, or module). |
| Diagnostic Trouble Code (DTC) | The B1619 code will be stored in the vehicle's computer system and can be retrieved using an OBD-II scanner. | Use an OBD-II scanner to confirm the presence of the B1619 code. Clear the code after addressing the underlying cause. |
| Solutions | ||
| Wiring Repair | Carefully inspect the wiring harness and connectors associated with the rear wiper motor and low limit switch. Look for signs of damage, corrosion, or loose connections. Repair or replace any damaged components. | Use appropriate wiring repair techniques, such as soldering and heat-shrinking, to ensure a secure and reliable connection. Apply dielectric grease to connectors to prevent corrosion. |
| Component Replacement | If the wiper motor or low limit switch is found to be faulty, replace it with a new or remanufactured unit. Ensure the replacement part is compatible with the vehicle's make and model. | Follow the manufacturer's instructions for replacing the wiper motor or switch. Disconnect the battery before working on the electrical system. |
| Control Module Diagnosis & Programming | If the control module is suspected to be faulty, have it diagnosed by a qualified technician. The module may need to be reprogrammed or replaced. | Control module diagnosis and programming often require specialized tools and expertise. Consult a qualified technician for assistance. |
| Ground Inspection & Repair | A poor ground connection can cause various electrical problems, including issues with the rear wiper system. Inspect the ground connections associated with the rear wiper motor and control module. Clean and tighten any loose or corroded ground connections. | Use a wire brush or sandpaper to clean ground connections. Apply dielectric grease to prevent corrosion. Ensure the ground connections are securely attached to the vehicle's chassis. |
Detailed Explanations
Wiring Problems: Damaged, corroded, or disconnected wiring can disrupt the signal from the low limit switch to the control module. This includes breaks in the wires, corrosion within the connectors, or loose connections. These issues can lead to intermittent or complete failure of the rear wiper system.
Faulty Wiper Motor: The rear wiper motor contains the low limit switch or has integrated circuitry that can fail. If the motor is internally damaged, it may not properly signal the control module when the wiper is in the park position. This can cause the wiper to run continuously or stop in an incorrect position.
Defective Switch: The low limit switch is responsible for signaling the control module when the wiper arm reaches the park position. If this switch fails, the control module will not receive the correct signal, leading to wiper malfunction. The switch can become corroded, worn out, or simply fail internally.
Control Module Issue: While less common, the body control module (BCM) or other relevant control module responsible for managing the rear wiper system can malfunction. This can be due to internal component failure, software glitches, or damage from electrical surges. A faulty control module can misinterpret signals or fail to send the correct commands to the wiper motor.
Wiper Malfunction: This is the most obvious symptom of a B1619 code. The rear wiper may not operate at all, may run continuously, or may not stop in the correct "parked" position. The specific behavior will depend on the nature of the underlying fault.
Diagnostic Trouble Code (DTC): The B1619 code is stored in the vehicle's computer system and can be retrieved using an OBD-II scanner. The presence of this code confirms that there is a problem with the rear wiper low limit input circuit.
Wiring Repair: This involves carefully inspecting the wiring harness and connectors associated with the rear wiper motor and low limit switch. Any damaged or corroded wires or connectors should be repaired or replaced to ensure a reliable electrical connection.
Component Replacement: If the wiper motor or low limit switch is found to be faulty, replacing it with a new or remanufactured unit is necessary. Ensure the replacement part is compatible with the vehicle's make and model to avoid further issues.
Control Module Diagnosis & Programming: If the control module is suspected to be faulty, it should be diagnosed by a qualified technician. The module may need to be reprogrammed or replaced to restore proper functionality. This often requires specialized tools and expertise.
Ground Inspection & Repair: A poor ground connection can cause various electrical problems, including issues with the rear wiper system. Inspect the ground connections associated with the rear wiper motor and control module. Clean and tighten any loose or corroded ground connections to ensure a proper electrical path.
Frequently Asked Questions
What does the B1619 code mean? The B1619 code indicates a problem with the rear wiper low limit input circuit, meaning the vehicle's computer isn't receiving the correct signal about the wiper's parked position. This often leads to wiper malfunction.
What are the common symptoms of a B1619 code? Common symptoms include the rear wiper not working, running continuously, or failing to park in the correct position. You might also see the B1619 code appear on a scan tool.
Can I fix the B1619 code myself? Depending on your mechanical skills, you might be able to fix it by inspecting and repairing wiring or replacing the wiper motor or switch. However, control module issues require professional diagnosis and programming.
How do I check the wiring for the rear wiper? Visually inspect the wiring harness for damage, corrosion, or loose connections. Use a multimeter to check for continuity and voltage.
How do I test the wiper motor? Use a multimeter to check the motor's resistance and voltage. A scan tool can also be used to activate the motor and monitor its performance. If the motor fails these tests, it likely needs replacement.
Conclusion
The B1619 Wiper Rear Low Limit Input Circuit Failure can be a frustrating issue, but understanding the potential causes and solutions can help you effectively diagnose and resolve the problem. Addressing wiring issues, replacing faulty components, and ensuring proper ground connections are crucial steps in restoring the rear wiper system to proper operation.