2022-2025 Acura MDX Power Seat Module: A Guide to 12-Way vs. 16-Way Seats

Understanding 2022-2025 Acura MDX Seat Options: The Key to Compatibility

Before diagnosing or replacing a power seat control module in a 2022-2025 Acura MDX, you must first identify which seat system your vehicle has. Acura uses two different power seat setups in this generation, and their control modules are not interchangeable. Installing the wrong module will result in it not functioning.

• 12-Way Power Seats: These are the standard seats found on the base MDX, Technology, and A-Spec® packages. They offer a standard range of adjustments but do not have advanced features like a massage function or a power-extending thigh cushion.
• 16-Way Power Seats: These upgraded seats are found on the Advance Package and Type S Advance trims. They include all the standard adjustments plus additional functions like power side bolsters, a power thigh extension, and a multi-mode massage feature.

Symptoms of a Failing Power Seat Control Module

When a seat control module begins to fail, it can cause a range of frustrating issues. While some symptoms point directly to the module, others can also be caused by a bad switch, a faulty motor, or wiring problems. Always start with the simplest diagnosis first (checking fuses).

• One or More Seat Functions Stop Working: The most common symptom is the loss of a specific adjustment. For example, the seat may recline but refuse to move forward or backward.
• Complete Seat Inoperability: The seat may become completely unresponsive to any switch inputs.
• Loss of Memory Seat Function: The memory buttons on the door may stop working, or the system may fail to recall the saved positions.
• Intermittent Operation: The seat may work sometimes but not others, which can point to a failing module or a loose electrical connection.
• Blown Fuses or Dead Battery: In rare cases, a module can develop an internal short circuit, causing it to repeatedly blow a fuse or create a parasitic drain that kills the battery.

Important Safety Recall: Front Passenger Seat Weight Sensor

While not related to the power seat control module, a major safety recall affects many 2022-2026 Acura MDX vehicles. The front passenger seat weight sensor, which is part of the airbag system, can crack and short circuit. This can prevent the passenger airbag from deploying correctly in a crash, increasing the risk of injury. Before performing any work, check with an Acura dealer or on the NHTSA website to see if your vehicle is affected by this recall (NHTSA Recall No. 24V064 and its expansions). The repair is performed by dealers free of charge.

Buying a Used Power Seat Control Module: What to Check

A used OEM module is often the most cost-effective solution for a failed unit, as aftermarket options are virtually nonexistent for this specific part. Follow these steps to ensure you get the right part.

1. Confirm Your Seat Type: First, determine if you have 12-way or 16-way seats. Check your window sticker or identify your trim (Base, Technology, A-Spec vs. Advance, Type S Advance). The easiest way is to look at your seat controls for massage or thigh extension buttons—if you don't have them, you likely have 12-way seats.
2. Match the Part Number: This is the most important step. If possible, remove the old module to get the exact part number printed on its label. Cross-reference it with these known part numbers:
   • Driver's Side (12-Way Seat): 81628-TYA-A21
   • Passenger's Side (12-Way Seat, No Massage/Extension): 81228-TYA-A21
   • 16-Way Seat Modules (for reference, do not buy for 12-way seats): 81628-TYB-A82 (Driver, w/ Massage), 81228-TYB-A81 (Passenger, w/ Massage), 81628-TYA-A61 (Driver, w/o Massage)
3. Inspect for Physical Damage: When the part arrives, carefully inspect the housing for cracks or signs of being pried open. Most importantly, check the connector pins for any signs of corrosion, water damage, or burning. Electronics located under the seat are vulnerable to spills.

Cost Comparison

Replacement Overview & Difficulty

Replacing the power seat control module is a manageable DIY job for someone with basic tools and patience. The module is located on the underside of the seat.

• Difficulty: 3 out of 5
• Estimated Time: 1 - 1.5 hours
• General Steps:
  1. Disconnect the battery. This is a mandatory safety step to prevent short circuits and accidental airbag deployment. Wait at least 3 minutes before proceeding.
  2. Move the seat to a position where you can access all four floor mounting bolts. If the seat is inoperable and blocking the bolts, this job becomes much more difficult.
  3. Remove the plastic covers from the seat track ends and unbolt the four bolts holding the seat to the vehicle floor.
  4. Carefully tilt the entire seat assembly backward to gain access to the wiring and modules underneath. Be gentle to avoid straining any wires.
  5. Locate the power seat control module. It's a small plastic box with several electrical connectors.
  6. Disconnect the electrical connectors and unbolt the module from the seat frame.
  7. Install the new module, reconnect the wiring, and bolt the seat back into place. Reconnect the battery and test all functions.

Frequently Asked Questions (FAQ)