1994-1996 Infiniti Q45 Seat Memory Module: Fixing Failed Memory and Heated Seats

Symptoms of a Failing Seat Memory Control Module

When the seat memory control module begins to fail, it can cause a range of frustrating issues related to the driver's seat functions. Because this module controls both memory and heating, a problem with either system could point to the module itself.

• Memory Seat Function Inoperative: The most common symptom is the complete failure of the memory seat function. The seat will not move when you press the '1' or '2' preset buttons on the door. The buttons may not light up, or they may blink without initiating any seat movement.
• Heated Seat Not Working: If the driver's side heated seat does not turn on, the control module could be the culprit. This can manifest as the switch lighting up but no heat being produced, or the switch not lighting up at all.
• Inability to Save New Memory Positions: You may find that while the power seat adjustments work manually, the system will not save a new position. When you try to set a new memory position, the system does not provide the confirmation chime or light, or it forgets the position immediately.
• Erratic Seat Movement: In rare cases, a faulty module can cause the seat to move on its own, or not move to the correct stored position. This can also be related to issues with the automatic entry/exit feature where the seat is supposed to slide back.
• Blinking Memory Set Lights: Forum users have reported that blinking lights on the memory set buttons can indicate a fault in the system, sometimes pointing to the control module or a related sensor.

Known Issues, Recalls, and Technical Service Bulletins (TSBs)

For a vehicle of this age, specific electronic issues are often documented by owner experiences rather than official manufacturer bulletins.

• No Recalls or TSBs: As of mid-2024, there are no specific recalls or Technical Service Bulletins (TSBs) from Infiniti or the National Highway Traffic Safety Administration (NHTSA) that directly address the 1994-1996 Q45 Seat Memory Control Module. Any recalls for the Q45 line are for different model years or different components.
• Common Electronic Failure: Like many automotive electronics from the 1990s, these modules can be susceptible to age-related failures of internal components like capacitors and solder joints. While not specifically documented in TSBs, this is a common failure mode for modules of this era.
• Check the "Cancel" Switch: Before assuming the module is bad, check the memory seat "cancel" switch, which is typically located on the driver's door or dash. Owners have sometimes pressed this button by accident, disabling the memory function entirely.

Buying a Used Seat Memory Control Module

Since new OEM modules have been discontinued, a quality used part is the most practical solution. Here’s what to look for:

• Match the Part Number: The most critical step is to match the OEM part number. For this specific application (driver's seat with memory and heat), the correct part number is 28565-67U01. A similar part, 28565-67U11, also fits 1993-1996 models with heated seats and is a valid replacement.
• Physical Inspection: When buying a used module, inspect the casing for any signs of physical damage, like cracks or broken mounting tabs. Most importantly, check the electrical connector pins for any signs of corrosion, which would indicate water damage and likely failure.
• Source and Mileage: Whenever possible, choose a part from a vehicle with lower mileage and from a dry climate to reduce the chances of electronic degradation or corrosion.
• Why Used OEM is Best: Aftermarket replacements for this specific, older module are virtually non-existent. A used OEM module is designed to meet Infiniti's original quality and durability standards, ensuring proper fit and function without the compatibility issues that can arise with third-party electronics.

Programming and Installation

One of the most significant advantages of working on this particular module is its simplicity.

• No Programming Required: The 1994-1996 Infiniti Q45 Seat Memory Control Module is a plug-and-play unit. It does not need to be programmed, flashed, or coded to the vehicle's VIN. You can simply swap the old module with a replacement.
• Location: The module is located under the driver's seat, attached to the seat frame.
• Replacement Process:
  1. Disconnect the negative terminal from the vehicle's battery to prevent any electrical shorts.
  2. Remove the four bolts holding the driver's seat to the floor of the car.
  3. Carefully tilt the entire seat backward to gain access to the wiring and modules underneath.
  4. Locate the Seat Memory Control Module. It is a black plastic box with electrical connectors.
  5. Disconnect the wiring harnesses from the old module, unbolt it from the seat frame, and install the new module in its place.
  6. Reconnect the wiring, tilt the seat forward, reinstall the four mounting bolts, and reconnect the battery.

Cost of Replacement

The cost can vary significantly depending on the source of the part and whether you perform the labor yourself.

Frequently Asked Questions (FAQ)