2008-2022 Toyota Sequoia 3rd-Row Power Seat Module: Diagnosis and Fixes

Symptoms of a Failing 3rd-Row Seat Control Module

When the power folding seat module begins to fail, the symptoms are usually straightforward. The most common sign is a complete lack of response when you press the fold or unfold button for one side of the third-row seat. The other side may continue to work normally. Here’s what to look for:

• One Side of 3rd-Row Seat is Unresponsive: The primary symptom is when the passenger (RH) or driver (LH) side of the 60/40 split third-row seat will not move when using either the switch by the seat or the switch in the cargo area.
• Intermittent Operation: The seat may work sometimes but not others, suggesting an internal electronic fault or a loose connection.
• Seat Only Moves in One Direction: You may be able to fold the seat down, but not raise it back up, or vice-versa. This can point to a failure within the module's internal relays or logic board.
• No Sound from Motor: When you press the switch, you hear no clicking from the module or humming from the seat motor. This indicates that power is not being sent to the motor. If you hear a click or hum but the seat doesn't move, the problem is more likely the motor itself or a mechanical jam.

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

As of mid-2026, there are no specific recalls or widespread Technical Service Bulletins (TSBs) issued by Toyota or the NHTSA for the third-row power seat control module in the 2008-2022 Sequoia. These modules are generally considered reliable. Many perceived "failures" are actually related to other, simpler issues.

One common issue that is often mistaken for a bad module is the system losing its position memory, which can happen after the vehicle's battery has been disconnected or replaced. This may require a simple re-initialization procedure.

Another issue reported by owners is a continuous beeping sound when trying to operate the seat. This is a built-in safety feature indicating that the seat is not in a fully up or fully down position, or that the safety system detects too much weight or an obstruction on the seat. Ensure the seat completes its full cycle or that nothing is on it before assuming a part has failed.

Programming and Re-Initialization

Does this module need to be programmed?

No, dealer programming or flashing is not required when replacing this module. It is a plug-and-play component. However, you may need to perform a simple, one-time re-initialization to ensure the system knows the seat's position limits.

How to Re-Initialize the Power Seat System

If your seat memory or folding function stops working after a battery change or module replacement, you can recalibrate it yourself. This process teaches the module the seat's full range of motion.

1. With the vehicle running, get to the seat controls.
2. Press and hold the recline button to move the seatback all the way forward until it stops.
3. Press and hold the recline button to move the seatback all the way back until it stops.
4. Press and hold the fold button to lower the entire seat into the floor until it stops completely.
5. Press and hold the raise button to bring the seat all the way up until it stops in its upright position.

By running the seat through its full range of motion for each function, the control module learns the start and end points. This simple procedure, often found on forums and in owner videos, can save a trip to the mechanic.

Buying a Used Power Seat Control Module

Since these modules are generally reliable and do not require programming, a used OEM unit is an excellent and cost-effective option. Aftermarket versions are not commonly available, making a recycled original part the best choice outside of a dealership.

• Match the Part Number Exactly: This is the most critical step. Toyota uses different modules for the driver (LH) and passenger (RH) sides of the third row. The passenger side module is part number 89715-0C020. The driver side is typically 89715-0C010. Do not interchange them.
• Inspect for Damage: Check the plastic housing for cracks and ensure all connector pins are straight and free of corrosion. Water intrusion is a potential cause of failure, so look for any signs of moisture or rust on or around the unit.
• Source from a Reputable Seller: Purchase from a seller that offers a warranty and has good reviews. This gives you recourse if the part is dead on arrival.

Replacement Overview

Replacing the module is a straightforward job for a DIYer with basic tools.

• Difficulty: 2/5 (Easy to Moderate)
• Estimated Time: 1 hour
• Tools Needed: Plastic trim removal tools, socket set.

Location: The third-row power seat control modules are located in the rear cargo area, behind the side trim panels, near the respective seats they control. To access the passenger side module (89715-0C020), you will need to remove the plastic trim panel on the right side of the cargo area. The module is typically a small black box mounted to the vehicle's body with a few bolts and has one or two electrical connectors.

Cost Comparison

Opting for a used OEM module can result in significant savings.

Frequently Asked Questions (FAQ)