2004-2008 Acura TL Seat Memory Failure: Why It Might Be Your Mirrors

Symptoms of a Failing Driver Memory System

When the memory system in your Acura TL starts to act up, it can be frustrating. The problem might not be the main control module itself. Here are the most common symptoms, which can point to several different components:

• Memory Buttons Are Dead: The buttons on the driver's door (SET, 1, 2) do not light up and do not respond when pressed.
• Inability to Save New Positions: You can adjust the seat manually, but the system won't save a new position when you press the 'SET' button.
• Key Fob Recall Fails: The seat and mirrors no longer automatically adjust to your saved position when you unlock and open the door with your key fob.
• Intermittent Function: The memory features work one day but not the next, or only respond after multiple button presses.
• Mirrors or Seat Move to Incorrect Positions: When a memory button is pressed, the seat or mirrors move erratically or to a random, unsaved position.

How to Diagnose the Problem: Check These First!

Before you buy a new module, perform these simple checks. In many cases, the Driver Memory Control Module is not the part that has failed.

1. Check the Fuse

For 2004-2005 TLs, Acura issued a Technical Service Bulletin (TSB) because the original 7.5-amp fuse for the memory system proved insufficient. The fix is to replace it with a 10-amp fuse. Check your under-dash fuse box; the diagram on the cover should show the correct fuse to inspect. If it's blown, replace it with the proper amperage.

2. Re-Link Your Key Fob

If the memory buttons on the door work but the car doesn't adjust when you unlock it, your key fob may have lost its link to the memory system. This is a simple fix:

1. Sit in the car and close all doors.
2. Press and hold the 'Lock' and 'Unlock' buttons on your key fob simultaneously for about two seconds.
3. The Multi-Information Display (MID) should confirm the key is paired.

Now, when you unlock the car with that fob, the MID should say "Welcome Driver 1" (or 2) and the system should recall your settings.

3. The Most Common Culprit: Faulty Side Mirror Actuators

The memory seat module, mirror actuators, and door switches are all part of the same circuit. If a mirror actuator fails, it can disrupt communication on the entire network, making it seem like the memory buttons or the main module are broken.

How to check: Use the power mirror joystick to move your side mirrors. If a mirror is jerky, twitches, makes a ratcheting noise, or moves uncontrollably (e.g., points straight up at the sky), the actuator for that mirror has likely failed. Replacing the faulty mirror actuator(s) very often restores full function to the memory seat buttons without ever touching the module under the seat.

Buying a Used Driver Memory Control Module

If you've ruled out the fuse, key fob pairing, and mirror actuators, the module itself may have failed. Since new OEM modules are often discontinued, the used market is your best option.

• Verify the Part Number: Look for a module with part number 81628-SEP-A01, 81628-SEP-A02, 81628-SEP-A03, or 81628-SEP-A04. These are interchangeable, with the higher numbers representing later revisions. An A04 is the most recent version.
• No Programming Required: This module is plug-and-play. It does not need to be programmed by a dealer or locksmith. You can install it yourself, and it will work immediately.
• Physical Inspection: When buying a used module, ensure the casing is not cracked and that the connector pins are clean, straight, and free of any green or white corrosion. Water intrusion is a common killer of electronic modules.
• Source and Warranty: Buy from a reputable seller that offers a warranty. This protects you in case the part is dead on arrival.

Replacement Overview

Replacing the module is a straightforward but physically involved job because it's located under the driver's seat. You will need to remove the seat to access it.

1. Disconnect the Battery: Always disconnect the negative battery terminal before working on any vehicle electronics.
2. Remove the Seat: Remove the plastic covers over the seat bolts at all four corners of the seat rails. Unbolt the seat from the floor. A Torx socket (IP50) may be required.
3. Access the Module: Carefully tilt the seat back to access the wiring harnesses and modules underneath. Disconnect the main seat harness.
4. Swap the Module: The Driver Memory Control Module is typically a black plastic box bolted to the seat frame. Unplug the connectors, unbolt it, and swap in the replacement unit.
5. Reassembly: Reinstall everything in the reverse order. Once the battery is reconnected, test the system. You may need to re-link your key fob.

Cost of Replacement (2004-2008 Acura TL)

Frequently Asked Questions (FAQ)