2011-2012 INFINITI QX56 Driver Power Seat Module: Solving Memory and Adjustment Failures

Symptoms of a Failing Power Seat Control Module

When the power seat control module in a 2011-2012 INFINITI QX56 begins to fail, the symptoms can range from a minor annoyance to a complete loss of seat adjustment. It's important to distinguish module failure from more common mechanical issues like a bad seat motor or switch.

• Complete Loss of Seat Control: The most obvious symptom is when none of the power seat switches work. If the seat is completely unresponsive, the module may have failed. However, always check the fuse first.
• Memory Function Failure: The seat may adjust manually, but the system fails to save or recall memory positions. You might find that the SET button does not light up, or it does not store a new position when pressed. The automatic adjustment linked to your key fob will also stop working.
• Intermittent Operation: The seat controls may work one moment and not the next. This can be caused by a failing module, a loose connection to the module, or a faulty switch.
• Loss of Settings After Power Loss: Some owners have reported rare instances of widespread electrical issues where a total power loss resets all vehicle settings, including the seat memory. While this may point to a larger problem with the Body Control Module (BCM) or power supply, it involves the seat module's memory function.

Known Issues, TSBs, and Recalls

While there are no specific recalls or Technical Service Bulletins (TSBs) for the 2011-2012 QX56 power seat control module itself, there are related service actions for the seat system you should be aware of.

• TSB ITB21-008A: This bulletin addresses an issue where the front seat gets stuck in the rearmost position and will not move forward. The official fix is to replace the entire seat lifter/slide assembly, which is a major mechanical repair. This is not a module failure.
• TSB ITB13-016: Addresses issues with the passenger airbag status light and the Occupant Classification System (OCS) control unit. This is a separate module from the driver's power seat control module and relates to the airbag system, not seat movement.
• Recall R20A6: A voluntary safety recall was issued to replace the driver-side airbag module on some 2011-2012 QX56 vehicles. This does not affect the power seat controls.

Diagnosis and Troubleshooting

If your power seat is acting up, follow these steps to narrow down the cause:

1. Check Fuses: Before assuming a part has failed, check the fuses. According to the fuse diagram for the 2011 QX56, there is a 10A fuse in the passenger compartment fuse box labeled "Seat memory Switch" (Fuse #10) that provides power to the module. There may be other related fuses for the seat motors themselves.
2. Test All Functions: Systematically test every seat switch (slide, recline, lift) and the memory buttons. Does only one function fail, or are all functions dead? A single failed function often points to a bad switch or motor, while a total failure is more likely a fuse or the module.
3. Listen for Motor Noise: As mentioned, hearing a motor run without movement is a clear sign of a mechanical problem (stripped gear), not an electronic one.
4. Inspect Wiring: The module is located under the driver's seat. Check the wiring harnesses connected to it for any obvious damage, pinching, or loose connections. Spilled liquids are a common cause of failure for under-seat electronics.

Programming and Calibration Requirements

Does this module need to be programmed?

No. The 2011-2012 INFINITI QX56 Power Seat Control Module, part number 285651LA0A, does not require any special programming, flashing, or dealer visit after installation. It is a plug-and-play component.

After installing a replacement module, you will simply need to re-program your desired seat, steering wheel, and mirror positions using the standard memory setting procedure: adjust your positions, press the "SET" button, and then press and hold the memory button (1 or 2) until the indicator light confirms it. You can also re-link the memory position to your Intelligent Key.

Buying a Used Power Seat Control Module

A used OEM module is an excellent, cost-effective solution for a failed unit, especially since no programming is required. Here’s what to look for:

• Verify the Part Number: Ensure the used module has the exact OEM part number: 285651LA0A. This part number is listed for 2011, 2012, and 2013 QX56 models.
• Physical Inspection: When you receive the part, inspect the case for any cracks or signs of being opened. Most importantly, check the electrical connector pins. They should be straight, clean, and free of any corrosion or discoloration, which could indicate water damage.
• Source Vehicle: While not essential, knowing the source vehicle had no flood damage is a plus. Since these modules are under the seat, they are vulnerable to damage from spills or water intrusion.
• Why Used OEM is Best: For this part, there are no reputable aftermarket alternatives. A used OEM module from a reputable recycler is the most reliable and economical choice. It was designed by Infiniti for your vehicle and will function correctly without any compatibility issues.

Replacement Procedure Overview

Replacing the power seat control module is a straightforward job for a DIYer with basic tools. The module is mounted to a cross-brace under the driver's seat.

1. Disconnect the Battery: Disconnect the negative battery terminal and wait at least 3 minutes to allow the systems, especially the airbag system, to fully discharge.
2. Unbolt the Driver's Seat: Slide the seat to access the front and rear mounting bolts. Remove the plastic covers over the bolts, then remove the four bolts holding the seat to the vehicle floor.
3. Access the Module: Carefully tilt the seat backward to gain access to the underside. You do not need to remove the seat from the vehicle.
4. Swap the Module: Locate the control module (Part No. 285651LA0A). It is typically held by two screws. Disconnect the electrical connectors, unscrew the old module, and install the new one in its place.
5. Reassemble: Reconnect the electrical connectors, bolt the seat back into place (torquing the bolts to spec), and reconnect the battery.
6. Set Memory: Turn the ignition on and follow the owner's manual procedure to set your seat memory positions.

Cost Comparison

The cost savings of choosing a used OEM module are significant.

Frequently Asked Questions (FAQ)