Introduction:
The B2164 Diagnostic Trouble Code (DTC) indicates a problem with the seat's rear vertical motor memory position. This code signals that the seat control module has detected an issue with the rear vertical motor's ability to accurately recall its stored position, hindering the seat's memory function and potentially causing discomfort. Addressing this code is crucial for restoring proper seat functionality and ensuring a comfortable driving experience.
| Symptom/Component | Possible Cause | Potential Solution |
|---|---|---|
| Seat Doesn't Move to Memory Position | Faulty Rear Vertical Motor | Replace the rear vertical motor. Ensure the new motor is properly calibrated. |
| Seat Movement Erratic/Jerky | Wiring Harness Issues (broken wires, loose connections) | Inspect the wiring harness for damage. Repair or replace any damaged sections. Clean and tighten any loose connections. |
| Seat Memory Function Inoperative | Faulty Seat Control Module (SCM) | Diagnose the SCM using a diagnostic scan tool. If faulty, replace and reprogram the SCM. |
| DTC B2164 Present | Incorrect Seat Position Sensor Readings | Check the seat position sensor for damage or misalignment. Replace or recalibrate the sensor as needed. |
| Seat Adjustment Limited | Obstruction in Seat Mechanism (debris, foreign objects) | Thoroughly inspect the seat mechanism for any obstructions. Remove any debris or foreign objects. |
| Intermittent Issue | Low Battery Voltage | Check the battery voltage. Ensure the battery is properly charged and functioning correctly. Replace if necessary. |
| Driver/Passenger Discomfort | Improper Seat Calibration | Recalibrate the seat using a diagnostic scan tool or the vehicle's built-in memory function. |
| Seat Motor Overheating | Excessive Use/Strain on Motor | Avoid repeatedly adjusting the seat over short periods. Allow the motor to cool down between adjustments. Address any binding in the seat mechanism. |
| Seat Memory Buttons Non-Responsive | Faulty Seat Memory Switch | Test the seat memory switch for proper function. Replace if faulty. |
| Software Glitch | SCM Software Issue | Check for software updates for the SCM. Flash the SCM with the latest software version. |
| Aftermarket Seat Installation | Incorrect Wiring/Compatibility Issues | Verify the aftermarket seat is compatible with the vehicle's electrical system. Review the installation instructions and wiring diagrams. |
| Previous Collision Damage | Damaged Seat Frame/Mechanism | Inspect the seat frame and mechanism for any damage resulting from a previous collision. Repair or replace damaged components. |
| Water Damage | Corrosion/Short Circuits | Inspect the seat motors, wiring, and SCM for signs of water damage. Clean or replace affected components. Apply dielectric grease to connections. |
| Recent Seat Repairs | Improper Reassembly/Calibration | Verify that the seat was reassembled correctly after any repairs. Recalibrate the seat memory function. |
| Extreme Temperatures | Motor Performance Degradation | Excessive heat or cold can impact motor performance. Allow the vehicle to reach a moderate temperature before adjusting the seat extensively. |
Detailed Explanations
Seat Doesn't Move to Memory Position: This is the most obvious symptom. The seat should automatically adjust to a pre-set position when a memory button is pressed. If it doesn't, it strongly suggests a problem with the memory function, potentially stemming from the rear vertical motor not responding correctly.
Faulty Rear Vertical Motor: The rear vertical motor is responsible for adjusting the seat's rear height. If this motor is failing or has failed completely, it will not be able to move the seat to the correct position, triggering the B2164 code. Internal motor damage or a worn-out armature are common causes.
Wiring Harness Issues (broken wires, loose connections): The wiring harness provides power and signal to the seat motor and the seat control module. Damaged or loose wires can interrupt communication, leading to incorrect seat positioning and the activation of the B2164 code. Visual inspection and continuity testing are crucial.
Faulty Seat Control Module (SCM): The SCM is the brain of the seat's electrical system, managing all seat adjustments and memory functions. A faulty SCM can misinterpret signals from the rear vertical motor, leading to the memory position error and the B2164 code. This often requires professional diagnosis and reprogramming.
DTC B2164 Present: The presence of the B2164 code itself is a diagnostic indicator of a problem within the rear vertical motor's memory position system. It confirms that the seat control module has detected an anomaly. It is essential to use a diagnostic scan tool to retrieve and clear the code after repairs.
Incorrect Seat Position Sensor Readings: The seat position sensor provides feedback to the SCM about the seat's current location. If this sensor is malfunctioning or misaligned, it can send incorrect information, causing the seat to move erratically or not reach the correct memory position, leading to the B2164 code.
Seat Adjustment Limited: If the seat can only move within a limited range, this may indicate a problem with the rear vertical motor or the seat mechanism itself. This limitation can prevent the seat from reaching its stored memory positions, triggering the B2164 code.
Obstruction in Seat Mechanism (debris, foreign objects): Physical obstructions can hinder the seat's movement, preventing it from reaching the desired memory position. This can strain the motor and potentially trigger the B2164 code. A thorough inspection and cleaning of the seat tracks and surrounding area are necessary.
Intermittent Issue: Intermittent problems can be difficult to diagnose. They often stem from loose connections, wiring issues that only manifest under certain conditions (e.g., temperature changes), or a failing component that is just beginning to show symptoms.
Low Battery Voltage: Low battery voltage can cause a variety of electrical problems in a vehicle, including issues with the seat memory function. Insufficient voltage can prevent the motor from operating correctly, leading to the B2164 code.
Driver/Passenger Discomfort: Although not directly related to the code's cause, the consequence of the seat not moving to the correct memory position is driver/passenger discomfort. Addressing the B2164 code resolves this issue.
Improper Seat Calibration: If the seat memory hasn't been properly calibrated, the stored positions may be inaccurate. Recalibrating the seat memory function using a scan tool or the vehicle's menu system can correct this issue.
Seat Motor Overheating: Repeated adjustments or strain on the motor due to an obstruction can cause overheating. Overheating can damage the motor and prevent it from functioning correctly, leading to the B2164 code.
Seat Memory Buttons Non-Responsive: If the seat memory buttons are not functioning, the seat will not be able to recall any stored positions. A faulty switch or wiring issue can prevent the buttons from operating.
Software Glitch: Occasionally, the SCM may experience a software glitch that prevents it from properly controlling the seat memory function. Updating the software may resolve this issue.
Aftermarket Seat Installation: Installing an aftermarket seat can introduce compatibility issues with the vehicle's electrical system. Incorrect wiring or a lack of proper integration with the SCM can cause the B2164 code.
Previous Collision Damage: A collision can damage the seat frame, mechanism, or wiring, leading to problems with the seat memory function and the B2164 code.
Water Damage: Water damage can cause corrosion and short circuits in the seat's electrical components, including the motor, wiring, and SCM. This can lead to erratic seat behavior and the B2164 code.
Recent Seat Repairs: If the seat was recently repaired, it's possible that it was not reassembled correctly or that the memory function was not recalibrated after the repair.
Extreme Temperatures: Extreme heat or cold can affect the performance of the seat motor, potentially causing it to operate erratically or fail to reach the correct memory position.
Frequently Asked Questions
What does the B2164 code mean? It indicates a problem with the rear vertical motor's ability to accurately recall its stored position in the seat memory system.
Can I fix the B2164 code myself? Depending on your mechanical skills, you might be able to inspect wiring and check for obstructions, but diagnosing a faulty SCM or motor often requires specialized tools and expertise.
Is it safe to drive with a B2164 code? Yes, but the seat may not adjust to the correct memory position, which can be inconvenient and uncomfortable.
How do I clear the B2164 code? You need a diagnostic scan tool to clear the code after addressing the underlying issue.
How much does it cost to fix a B2164 code? The cost can vary greatly depending on the cause, ranging from a simple wiring repair to replacing the motor or SCM, potentially costing several hundred dollars.
Will a dead battery cause this code? Potentially, yes. Low battery voltage can sometimes cause electrical glitches, so ensuring a healthy battery is a good first step.
Can I still manually adjust my seat with this code active? Yes, you should still be able to manually adjust the seat, even if the memory function isn't working.
Is recalibration always necessary after replacing the motor? Yes, recalibration is crucial to ensure the new motor is properly synchronized with the seat control module and the memory positions are accurate.
What is the seat control module (SCM)? The SCM is the computer that controls the various functions of the power seat, including memory, tilt, and height adjustments.
Where can I find the seat position sensor? The seat position sensor is typically located near the seat motor or within the seat mechanism itself. Refer to the vehicle's service manual for specific location information.
How do I know if the SCM needs to be reprogrammed? After replacing the SCM, it usually needs to be programmed with the vehicle's specific configuration data to function correctly. A diagnostic scan tool can determine if reprogramming is required.
What is the difference between seat calibration and seat programming? Seat calibration involves setting the limits and ranges of the seat's movement, while seat programming involves loading software and configuration data onto the SCM.
Can water damage cause the B2164 code? Yes, water damage can corrode electrical components and cause short circuits, leading to various seat malfunctions, including the B2164 code.
Will disconnecting and reconnecting the battery reset the code? Disconnecting the battery might temporarily clear the code, but it will likely return if the underlying problem persists. It's not a reliable solution.
How often do seat motors need to be replaced? The lifespan of a seat motor depends on usage and environmental factors. However, they are generally durable and can last for many years.
Is it possible to test the rear vertical motor before replacing it? Yes, you can use a multimeter to check the motor's resistance and voltage. Consult the vehicle's service manual for specific testing procedures.
Conclusion
The B2164 code signals a problem with the rear vertical motor memory position, often resulting in the seat not moving to its programmed memory positions. Thoroughly investigating the motor, wiring, and SCM, and performing recalibration are crucial steps to resolve this issue and restore proper seat functionality.