2004-2008 Acura TL Seat Memory Module: Fixing Failed Presets and Erratic Seats

Symptoms of a Failing Seat Memory Module

When the seat memory module in a 2004-2008 Acura TL begins to fail, it can cause a range of frustrating issues. You may notice one or more of the following symptoms:

• Memory Buttons Don't Work: The most common symptom is that pressing the '1' or '2' memory buttons on the driver's door panel does nothing. The seat and mirrors will not move to their stored positions.
• Unable to Save New Settings: The 'SET' or 'MEMO' button may become unresponsive. When you press it, you won't hear a beep, and the system will not save a new position.
• Seat Moves Erratically: Upon unlocking the car, the seat might move to an incorrect or extreme position, such as reclining all the way back into the rear seat.
• Intermittent Manual Control: When using the main power seat switches, the seat may only move an inch or two at a time, requiring multiple presses to move it fully forward or back.
• Dead Memory Buttons: In some cases, the memory buttons on the door panel will be completely dead, with no backlighting when the headlights are on and no response when pressed.
• Key Fob Link Fails: The car may recognize 'Driver 1' or 'Driver 2' on the dashboard display, but the seat and mirrors fail to adjust automatically.

How to Diagnose the Problem

Before buying a new module, follow these diagnostic steps. Many memory seat issues on the Acura TL are caused by other, simpler problems.

1. Check Key Fob Pairing: Sometimes the key fob can become un-linked from the memory system. Try re-linking it by pressing and holding the 'Lock' and 'Unlock' buttons on the fob simultaneously until the indicator light blinks. Also, try setting the memory with the key in the ignition (position II) and the parking brake engaged.
2. Check Fuses: A blown fuse can disable the system. There was a Technical Service Bulletin (TSB) for 2004-2005 models to upgrade the fuse from 7.5A to 10A, so it's worth checking.
3. THE MIRROR ACTUATOR TEST: This is the most important diagnostic step. The seat memory module is connected to the power mirror actuators. If an actuator fails, it can disrupt the entire memory system, causing the memory buttons to stop working completely. Check if your mirrors move smoothly in all directions. If they are jerky, make grinding noises, or don't move properly, a faulty mirror actuator is the likely cause of your seat memory problem. Replacing the faulty mirror actuator(s) often restores seat memory function without needing to replace the module.
4. Inspect Under-Seat Wiring: Wires in the main 20-pin connector under the driver's seat can become brittle and break over time, leading to intermittent power seat functions. With the battery disconnected, carefully inspect the wiring harness going into the module for any broken or damaged wires right at the connector.

Known Issues, TSBs, and Recalls

There are no recalls for this specific part. However, Acura did issue a Technical Service Bulletin (TSB) for early models.

• TSB 04-005: This TSB was released for 2004-2005 Acura TL models experiencing issues where the memory seat settings would not store or recall properly. The fix involved replacing the original module (part number 81628-SEP-A01) with an updated version (81628-SEP-A02). Subsequent versions ending in -A03 and -A04 have also been released, presumably with further improvements.

Programming and Installation Requirements

The 2004-2008 Acura TL Seat Memory Control Module is plug-and-play and does not typically require any programming or flashing after installation. As long as you purchase a replacement module with a part number that matches your original, you should be able to install it and have it function immediately. While one seller noted programming may be needed, the overwhelming consensus from owners and other retailers is that it is not necessary. To ensure compatibility, always match the part number printed on your original module.

Buying a Used Seat Memory Control Module

A used OEM module is an excellent, cost-effective alternative to an expensive new part. Since these modules are plug-and-play, a used unit can restore function at a fraction of the cost.

• Verify the Part Number: The most critical step is to match the part number. You must access the module under your driver's seat to read the number on the sticker. The part number will look like 81628-SEP-A0X. While later revisions like A04 are ideal as they supersede earlier ones, matching your exact number is the safest bet.
• Physical Inspection: When you receive the used part, inspect the plastic housing for cracks or damage. Most importantly, look at the connector pins to ensure they are straight, clean, and free of any green or white corrosion, which would indicate water damage.
• Why Used OEM is a Good Choice: Unlike complex engine computers, this is a simple convenience module. A reliable, tested used OEM unit will have the correct software and hardware for your vehicle, ensuring the plug-and-play compatibility that cheap aftermarket alternatives can't guarantee.

Replacement Walkthrough

Replacing the module requires removing the driver's seat. The difficulty is moderate and should take about 1-2 hours.

1. Disconnect the negative terminal from your car's battery.
2. Slide the driver's seat all the way forward to access the two rear mounting bolts. Remove them.
3. Slide the seat all the way back to access the two front mounting bolts. Remove them.
4. Carefully tilt the entire seat backward to access the wiring harnesses underneath.
5. Disconnect all electrical connectors from the bottom of the seat.
6. Remove the seat from the vehicle. Place it on a soft surface to avoid damaging the upholstery.
7. The seat memory module is a black plastic box bolted to the seat frame. Unbolt it, disconnect its harness, and swap it with the replacement unit.
8. Installation is the reverse of removal. Reconnect all harnesses before bolting the seat back into the car. Reconnect the battery last. You will likely need to reprogram your saved seat positions.

Cost of Replacement

Prices can vary, but here is a general cost comparison:

Frequently Asked Questions (FAQ)