2006-2010 Toyota Sienna Driver Memory Control Module: Fixing & Replacing a Faulty Unit

Symptoms of a Failing Driver Memory Control Module

When the memory module begins to fail, it usually affects convenience rather than the vehicle's drivability. The power seat and mirror functions may still work manually, but the memory recall feature will be unreliable.

• Memory Positions Won't Save or Recall: The most common symptom is the inability to save a new seat position or recall a previously saved one. You might press the 'SET' button and a number, but the system doesn't beep or acknowledge the command.
• Intermittent Function: The memory feature may work one day and not the next. This can sometimes be related to temperature changes or simply the internal electronics beginning to degrade.
• Seat Moves to the Wrong Position: When you press a memory button, the seat and mirrors may move to an incorrect or random position instead of the one you saved.
• Unresponsive Memory Buttons: The 'SET', '1', and '2' buttons on the door panel may become completely unresponsive, while the manual power seat controls on the side of the seat continue to work normally.
• Power Seat Functions Stop Working: In less common cases, a complete failure of the module can lead to a loss of all power seat movement, as it may control the power distribution to the seat motors.

Known Issues, Recalls, and TSBs

For the 2006-2010 Toyota Sienna, there are no specific recalls or Technical Service Bulletins (TSBs) issued by Toyota or the NHTSA that directly target the Driver Memory Control Module (part number 89430-AE010). Searches for recalls on this generation of Sienna primarily show issues related to the spare tire carrier, power sliding doors, and labeling. While there was a recall related to aftermarket seat heaters, it does not pertain to the OEM memory seat system. The absence of specific TSBs suggests that failure of this module is not a widespread, systemic problem but rather occurs on a case-by-case basis due to age or other factors.

Programming and Installation: Is a Dealer Visit Required?

No, programming is typically not required. The Driver Memory Control Module for the 2006-2010 Toyota Sienna is a plug-and-play component. The memory positions are stored within the module itself, and it is not tied to the vehicle's immobilizer system or main ECU in a way that requires dealer-level programming. When replacing the module, you can simply install the new one, and it will be ready to learn new memory positions. You will need to perform the standard memory setting procedure as if it were a new car: adjust the seat and mirrors to your liking, press 'SET', and then press and hold '1' or '2' until it beeps.

Buying a Used Driver Memory Control Module

Purchasing a used OEM module is a cost-effective way to restore your memory seat function. Since these modules are not a high-failure part and do not require programming, a used unit is an excellent option.

• Verify the Part Number: The most critical step is to match the part number. The correct Toyota part number is 89430-AE010. You may also see the Denso (original manufacturer) number, which is 123300-6701. This module is located under the driver's seat, attached to the seat frame. You may need to unbolt the seat and tilt it back to access and verify the number on your original part before ordering a replacement.
• Vehicle Compatibility: This part is specifically for 2006-2010 Toyota Sienna models equipped with the memory seat and mirror package. It will not work on vehicles that did not originally come with this feature.
• Physical Inspection: When buying a used module, check for any signs of physical damage, especially water intrusion. The connectors should be clean with no green or white corrosion on the pins. Ensure the plastic housing is not cracked and all mounting tabs are intact.
• Why Used OEM is a Good Choice: For electronic modules like this, a used original equipment (OEM) part is often more reliable than a new, unbranded aftermarket part. The OEM unit was designed and tested by Toyota for this specific vehicle, ensuring proper communication and function with the rest of the car's systems.

Replacement Overview

Replacing the module is a straightforward job for a DIY mechanic with basic tools. The module is located directly under the driver's seat.

1. Disconnect the Battery: Always disconnect the negative battery terminal before working on any vehicle electronics.
2. Access the Module: In most cases, you will need to unbolt the driver's seat from the floor to get enough clearance. There are typically four bolts holding the seat to the chassis.
3. Tilt the Seat: Carefully tilt the seat backward to expose the wiring and modules underneath. Do not stress the wiring harnesses.
4. Locate and Swap the Module: The memory control module (89430-AE010) is a small black box clipped to the seat frame. Disconnect the two wiring harness connectors and release the clips holding it in place.
5. Install the New Module: Clip the replacement module into place and reconnect the wiring harnesses.
6. Reassemble and Test: Bolt the seat back into place, reconnect the battery, and test the memory function by saving and recalling a new position.

Cost of Replacement

Frequently Asked Questions (FAQ)