B1719 Seat Driver Forward Switch Circuit Short To Battery

Introduction:

The B1719 trouble code indicates a fault within the driver's seat forward switch circuit. This circuit is responsible for controlling the forward movement of the driver's seat. A "short to battery" condition means that the circuit is unintentionally receiving direct voltage from the vehicle's battery, which can cause unexpected seat movement, circuit damage, or even pose a fire hazard. Understanding the causes, symptoms, and diagnostic procedures for this code is crucial for safe and effective vehicle repair.

Comprehensive Table: B1719 Seat Driver Forward Switch Circuit Short To Battery

Detailed Explanations:

Code Definition: B1719

The diagnostic trouble code (DTC) B1719 specifically indicates that the vehicle's computer has detected a short to battery within the driver's seat forward switch circuit. This means that the circuit is receiving unintended voltage directly from the battery, bypassing the intended control mechanisms.

Symptoms

• Seat moves forward without driver input: This is the most obvious and concerning symptom. The seat may move forward intermittently or continuously without any activation of the forward switch.
• Seat adjustment non-functional: The forward seat adjustment may not work at all. Other seat functions might still work, or the entire seat control system could be disabled.
• Blown fuse (related to seat control): A short circuit can cause excessive current draw, leading to the fuse protecting the seat control circuit to blow repeatedly.
• Battery drain: A constant short to battery can slowly drain the vehicle's battery, especially if the vehicle is left parked for extended periods.
• Seat motor continuously running (forward): The seat motor may run continuously in the forward direction, even when the switch is not activated. This can damage the motor and the seat mechanism.
• Diagnostic Trouble Code (DTC) B1719 present: The DTC will be stored in the vehicle's computer and can be retrieved using a scan tool.

Possible Causes

• Shorted wiring: Damaged or frayed wiring within the seat control circuit can create a direct connection to the battery voltage. This is often caused by wear and tear, chafing against metal parts, or rodent damage.
• Damaged forward switch: A faulty forward switch can internally short circuit, providing a constant voltage signal to the seat motor.
• Faulty seat control module: The seat control module is responsible for regulating the seat's movements. If the module malfunctions, it can send unintended signals to the seat motor, causing it to move forward.
• Corroded connectors: Corrosion on electrical connectors can create a path for current to flow where it shouldn't, leading to a short circuit.
• Wiring harness damage: The wiring harness that connects the seat components can be damaged by physical impact, heat, or moisture, leading to short circuits.
• Internal short within the seat motor: Although less common, the seat motor itself can develop an internal short circuit, causing it to run continuously.

Diagnostic Steps

• Visual inspection of wiring and connectors: Carefully inspect all wiring and connectors associated with the seat control system for signs of damage, corrosion, or loose connections. Pay close attention to areas where the wiring harness passes through the seat frame or other metal parts.
• Check for blown fuses: Locate the fuse that protects the seat control circuit and check if it's blown. If it is, replace it with a new fuse of the correct amperage. If the fuse blows again immediately, it indicates a short circuit in the system.
• Use a multimeter to test circuit voltage and continuity: Use a multimeter to test the voltage and continuity of the seat control circuit. Refer to a wiring diagram for the specific voltage levels and pin locations. Check for voltage on the forward switch circuit when the switch is not activated. Also, check for continuity between the circuit and ground, which would indicate a short.
• Scan for other related DTCs: Use a scan tool to check for other DTCs related to the seat control system or the vehicle's electrical system. These codes can provide additional clues about the cause of the B1719 code.
• Isolate the seat control module: Disconnect the seat control module and retest the circuit. If the short circuit disappears, it indicates that the module is faulty.
• Inspect the seat motor: Disconnect the seat motor and test it separately. Check for internal shorts or other signs of damage.

Repair Procedures

• Repair or replace damaged wiring: If you find damaged wiring, repair it by splicing in new wire and using heat-shrink tubing to protect the connection. If the damage is extensive, replace the entire wiring harness.
• Replace faulty forward switch: If the forward switch is found to be faulty, replace it with a new one. Ensure that the new switch is compatible with your vehicle.
• Replace faulty seat control module: If the seat control module is found to be faulty, replace it with a new or remanufactured module. The new module may need to be programmed to your vehicle.
• Clean or replace corroded connectors: Clean corroded connectors with a wire brush or electrical contact cleaner. If the corrosion is severe, replace the connectors.
• Replace damaged wiring harness: If the wiring harness is extensively damaged, replace it with a new one.
• Replace the seat motor: If the seat motor is found to be faulty, replace it with a new one.

Tools Required

• Multimeter: Used to measure voltage, current, and resistance in the electrical circuit.
• Wiring diagrams: Essential for understanding the layout of the seat control circuit and identifying the correct wires and connectors.
• Socket set: Used to remove and install seat components.
• Screwdriver set: Used to remove and install screws and fasteners.
• Wire stripper/crimper: Used to strip and crimp wires when repairing or replacing wiring.
• Scan tool: Used to retrieve DTCs and monitor the seat control system.

Related DTCs

• Other seat control codes (e.g., B1720, B1721): These codes may indicate faults in other seat control circuits, such as the rearward, up, or down adjustment.
• Codes related to power supply (e.g., B1000): These codes may indicate problems with the vehicle's power supply, which can affect the seat control system.
• CAN bus communication errors (e.g., U codes): These codes may indicate problems with the vehicle's communication network, which can prevent the seat control module from communicating with other modules.

Severity

The severity of a B1719 code is considered moderate to high. The potential for unexpected seat movement poses a safety risk, and the short circuit can cause electrical damage and battery drain. Addressing this issue promptly is crucial.

Common Vehicle Makes Affected

While the B1719 code can occur in various makes and models, it's commonly observed in vehicles from Ford, GM, and Chrysler. Specific models and years may be more prone to this issue due to design or manufacturing factors.

Component Location

• Forward switch: Typically located on the side of the driver's seat.
• Seat control module: Usually located under the driver's seat.
• Wiring harness: Runs along the floor and under the seat, connecting the seat components to the vehicle's electrical system.

Frequently Asked Questions:

• What does a B1719 code mean? The B1719 code indicates a short to battery in the driver's seat forward switch circuit, meaning the circuit is receiving unintended voltage. This can cause the seat to move unexpectedly.

• Can I drive my car with a B1719 code? It's not recommended. The unexpected seat movement can be distracting and potentially dangerous, and the short circuit can cause further electrical damage.

• How do I fix a B1719 code? Diagnosis involves checking wiring, connectors, switches, and the seat control module. Repair typically involves fixing or replacing damaged components.

• Is a B1719 code serious? Yes, it's considered moderately to highly serious due to the potential safety risks and electrical damage.

• Can a blown fuse cause a B1719 code? While the code itself indicates a short, a blown fuse is often a symptom of the short circuit causing the B1719 code.

Conclusion:

The B1719 code represents a serious issue that requires prompt attention. A thorough diagnostic process is essential to identify the root cause of the short circuit and prevent further damage or safety hazards. Seeking professional assistance from a qualified mechanic is recommended if you lack the necessary skills or tools to perform the repairs yourself.