Introduction:
The B1655 diagnostic trouble code (DTC) indicates a fault within the circuit responsible for the "Rear Up" function of the driver's seat. This function typically involves adjusting the rear portion of the seat upwards, providing lumbar support or changing the seat's angle. A B1655 code can lead to discomfort, impaired seat adjustability, and potentially safety concerns if the driver cannot properly position themselves. Diagnosing and addressing this issue promptly is crucial for both comfort and safe driving.
Comprehensive Table: B1655 Seat Driver Rear Up Circuit Failure
| Topic | Description | Possible Solutions |
|---|---|---|
| Code Definition | B1655 is a manufacturer-specific DTC indicating a fault in the driver's seat rear up circuit. The specific definition might vary slightly based on the vehicle make and model, but it generally points to an open circuit, short circuit, high resistance, or a malfunction in the control module related to the seat's rear upward adjustment. | Consult the vehicle's service manual or a reputable online database (like ALLDATA or Mitchell OnDemand) for the exact definition and diagnostic procedure specific to your vehicle. This will provide the most accurate interpretation of the code and guide you through the correct troubleshooting steps. |
| Symptoms | The most common symptom is the inability to adjust the rear portion of the driver's seat upwards. Other symptoms might include: Intermittent seat adjustment functionality. Unusual noises coming from the seat during attempted adjustment. The seat motor not operating at all when attempting to raise the rear. Other seat functions may also be affected (if the circuits share a common ground or power supply). * The "Check Engine" light might be illuminated, although this is less common for seat-related DTCs. | Verify the symptom: Confirm the seat's rear up function is indeed not working. Listen for motor noises when attempting adjustment. * Check if other seat functions are also affected. |
| Possible Causes | Several factors can trigger a B1655 code: Faulty Seat Motor: The motor responsible for the rear up adjustment might be defective. Wiring Issues: Damaged, corroded, or loose wiring in the seat circuit. This includes broken wires, poor connections, or shorts to ground or power. Faulty Seat Switch: The switch used to control the seat's rear up function could be malfunctioning. Faulty Seat Control Module: The electronic control module (ECU) that manages the seat's functions could be defective. Blown Fuse: A blown fuse in the seat circuit. Open Circuit: A break in the wiring preventing the signal from reaching the motor. * High Resistance: Corrosion or loose connections creating excessive resistance in the circuit. | Visually inspect all wiring and connectors in the seat circuit for damage or corrosion. Use a multimeter to check for continuity and voltage at various points in the circuit. Test the seat switch for proper operation. Check the seat motor for resistance and voltage. Inspect the fuse associated with the seat circuit. Consider the possibility of a faulty seat control module (though this is less common). |
| Diagnostic Steps | A systematic approach is crucial for accurate diagnosis: 1. Retrieve the DTC: Use a scan tool to confirm the B1655 code and check for any other related DTCs. 2. Visual Inspection: Carefully inspect all wiring, connectors, and the seat motor for any signs of damage, corrosion, or looseness. Pay close attention to wiring harnesses that move with the seat. 3. Fuse Check: Check the fuse associated with the seat circuit. Replace if blown. 4. Voltage and Continuity Testing: Use a multimeter to check for proper voltage at the seat motor connector when the seat adjustment switch is activated. Also, check for continuity in the wiring between the switch, the motor, and the control module. 5. Switch Testing: Test the seat adjustment switch for proper operation using a multimeter. 6. Motor Testing: Test the seat motor directly by applying voltage to it. If the motor doesn't respond, it's likely faulty. 7. Control Module Testing: This is often the last step, as control module failures are less common. It might require specialized equipment and knowledge. |
Detailed Explanations:
Code Definition:
The B1655 code is a signal from the vehicle's onboard computer that there is a problem with the electrical circuit that controls the rear portion of the driver's seat when it attempts to move upwards. This is a manufacturer-specific code, meaning the exact meaning can vary slightly from one car brand to another. However, the core problem remains the same: the system isn't functioning as expected when trying to raise the seat back. This could be due to a variety of electrical issues within the system, and it is important to understand that the code itself is not the problem, but rather an indication of a problem.
Symptoms:
The primary symptom of a B1655 code is the inability to raise the rear of the driver's seat. This means that when the driver uses the seat adjustment controls, the rear portion of the seat does not move upwards as intended. There may be other symptoms, such as an intermittent function where the seat works sometimes but not others, or strange noises coming from the seat when the adjustment is attempted. In some cases, other seat functions might be affected as well, particularly if they share the same wiring or power source. While less common, the Check Engine light might also illuminate, although this is more typical for engine-related issues.
Possible Causes:
A B1655 code can be triggered by a range of issues within the seat's electrical system. A faulty seat motor is a common culprit, as the motor might be worn out or damaged. Wiring issues are also a frequent cause, including broken wires, corroded connectors, or loose connections that disrupt the electrical flow. The seat switch itself could be malfunctioning, preventing the signal from reaching the motor. In rarer cases, the seat control module (the computer that controls the seat's functions) could be defective. Other possibilities include a blown fuse in the seat circuit or a short circuit somewhere in the wiring. Finally, high resistance within the circuit, often caused by corrosion or loose connections, can also prevent the system from functioning correctly.
Diagnostic Steps:
Diagnosing a B1655 code requires a systematic approach. First, retrieve the DTC using a scan tool to confirm the code and check for any other related codes that might provide additional clues. Next, perform a visual inspection of all wiring, connectors, and the seat motor, looking for any signs of damage, corrosion, or looseness. Then, check the fuse associated with the seat circuit and replace it if blown. The next step involves voltage and continuity testing using a multimeter to check for proper voltage at the seat motor connector when the switch is activated and to check for continuity in the wiring between the switch, motor, and control module. Test the seat switch for proper operation using a multimeter. If the switch is working, test the seat motor directly by applying voltage to it; if the motor doesn't respond, it's likely faulty. Finally, if all other components check out, consider the possibility of a faulty control module, although this is often the least likely cause.
Frequently Asked Questions:
What does the B1655 code mean?
The B1655 code indicates a problem in the circuit that controls the rear up function of the driver's seat. It usually means there's an electrical issue preventing the seat from adjusting properly.
Can I still drive my car with a B1655 code?
Yes, you can usually still drive your car, but the seat adjustment may not work. While not directly affecting drivability, an improperly adjusted seat can impact comfort and safety.
How do I fix the B1655 code?
The fix depends on the cause, but common solutions include repairing wiring, replacing the seat motor, or replacing the seat switch. A proper diagnosis is needed to pinpoint the exact problem.
Is the B1655 code a serious problem?
While not a critical safety issue, it can affect driver comfort and potentially safety if the seat cannot be properly adjusted. Addressing it promptly is recommended.
Can a blown fuse cause the B1655 code?
Yes, a blown fuse in the seat circuit can definitely cause the B1655 code. Always check the fuse first as it's the easiest thing to check.
How much does it cost to fix a B1655 code?
The cost can vary depending on the cause and the shop's labor rates, but expect to pay anywhere from $100 for a simple wiring repair to several hundred dollars for a new seat motor or control module.
Can I fix the B1655 code myself?
If you have electrical troubleshooting skills and access to a multimeter and wiring diagrams, you might be able to diagnose and fix the problem yourself. However, proceed with caution and consult a professional if you're unsure.
Conclusion:
The B1655 diagnostic trouble code indicates a fault in the driver's seat rear up circuit, which can result from various electrical issues. A systematic approach to diagnosis, including visual inspection, voltage testing, and component testing, is essential for identifying and resolving the problem, ensuring both comfort and safety.