2017-2019 Buick LaCrosse Front Seat: Solving Failures and Decoding Options
This guide covers common front seat problems, from dead motors to feature mismatches, and explains how to choose the correct used replacement.
- Compatibility is critical: You must match your car's exact options (power, heat, ventilation, massage, memory) and electrical connector when buying a used seat.
- Safety first: Always disconnect the battery for at least 30 minutes before unplugging a seat to disable the integrated side airbag and prevent injury.
- Common failures are electrical, including dead adjustment motors, failed heating elements, or faulty control modules. A weak car battery can also cause seat electronics to fail.
- Check for open recalls on your VIN, especially recall 17V-437 for the airbag control module (SDM), which can prevent airbags from deploying.
Symptoms of a Failing Front Seat
Failures in the LaCrosse front seat are almost always electrical, but can sometimes be mechanical. Here are the most common symptoms:
- Power Functions Inoperative: One or more of the power seat adjustments stop working. The seat may be stuck in one position, unable to move forward, backward, up, down, or recline. This is often due to a failed motor or switch.
- Heated or Ventilated Seats Don't Work: The button for the feature may light up, but the seat never heats up or cools down. This usually points to a faulty heating element or ventilation blower within the seat cushion. A diagnostic scan may show an error for an open circuit in the heating mat.
- Memory Seat Failure: The seat fails to automatically adjust to the preset position when the car is started or the memory button is pressed. This can be an issue with the Power Seat Control Module.
- Airbag (SRS) Light is On: An SRS warning light on the dashboard can indicate a problem with the wiring, connector, or the side airbag module integrated into the seat. This is a critical safety issue that should be addressed immediately.
- Seat Feels Loose or Rocks: Some owners report a slight rocking motion, which could be caused by worn tracks or a problem with the seat adjuster actuator.
- Complete Electrical Failure: In some cases, a weak or failing vehicle battery can cause strange electrical issues, including the power seats becoming completely unresponsive. One owner reported a dead passenger seat was resolved after addressing a battery problem, even though the car was still starting normally.
Buying a Used 2017-2019 LaCrosse Front Seat: What to Check
Choosing a used OEM front seat is often the only cost-effective option, as new assemblies are extremely expensive and complete aftermarket seats are not available. However, careful verification is required to ensure you get a compatible part.
The Critical Compatibility Check: Options and Connectors
The 2017-2019 LaCrosse was available in several trims (1SV, Preferred, Essence, Sport Touring, Premium, and Avenir), each with different standard and optional seat features. You must match your vehicle's exact features. A seat with different options will likely have a different wiring harness and will not work correctly.
- Power Adjustments: All trims came with 8-way power adjustable front seats.
- Heated Seats: Standard on Essence trim and above.
- Ventilated & Massage Seats: These were features on the highest Premium and Avenir trims.
- Memory Seats: This feature is tied to the Power Seat Control Module and is typically found on upper trims.
Pro Tip: The easiest way to verify compatibility is to look at the large electrical connector under the seat. Compare the connector from the donor vehicle to your original seat. The shape, size, and number of pins must be identical.
Verifying Trim Color
LaCrosse interiors for this generation came in a few main colors, often referred to as Jet Black, Brandy (a dark brown/red), and Shale or Titanium (light gray/beige). To be certain, find the Service Parts Identification sticker on your vehicle. It is usually located in the glove box. On this sticker, you will find a list of three-character codes. The interior trim code is the one that ends with the letter "I".
Physical Inspection Checklist
- Check the Airbag: Ensure the side airbag module is present and has not been deployed. There should be no rips or tears in the side bolster where the airbag is located.
- Inspect the Wiring: Look for any cut wires, damaged connectors, or signs of previous repair on the harness under the seat.
- Examine the Frame and Tracks: Check for cracks, bends, or significant rust on the metal seat frame and mounting tracks.
- Test the Motors (If Possible): If you have access to a 12V power source, you can try to briefly apply power to the motor pins on the main connector to test the various adjustment functions.
- Check the Upholstery: Inspect the leather or leatherette for rips, burns, deep cracks, or heavy stains.
Known Issues, Recalls, and Service Bulletins
While there are no major safety recalls specifically for the seat structure on the 2017-2019 LaCrosse, there are related service actions and recalls you should be aware of.
- Recall 17V-437 / N172098360: This important recall concerns the Sensing and Diagnostic Module (SDM) software. A software error could prevent the front airbags and seat belt pretensioners from deploying in a crash. GM dealers will reflash the software for free. Ensure this recall has been performed on your vehicle.
- Recall 18V-358: Affects 2018-2019 models. Insufficient coating on the rear brake caliper pistons could reduce braking performance.
- TSB PIC6048G: Addresses customer comments on the operation of the haptic feedback seat during Lane Keep Assist events, clarifying that its function is different from Lane Departure Warning.
- TSB for Seat Belt Extender: A bulletin was issued regarding the availability of a seat belt extender for customers who need one.
Note: A recall for improperly welded seat frames (N192278300) affects some 2019-2020 GM vehicles, but the documentation specifies the Buick Regal, not the LaCrosse.
Replacement Overview & Difficulty
Replacing the entire front seat assembly is moderately difficult due to the weight of the seat and the critical safety procedures for the integrated airbag.
- Difficulty: 3 out of 5
- Estimated Time: 1.5 hours
- DIY Feasible: Yes, for mechanically experienced individuals who follow safety procedures carefully.
Basic Steps:
- CRITICAL: Disconnect the negative terminal of the vehicle's 12V battery. Wait at least 30 minutes for the airbag system's backup power to fully discharge. Failure to do this can result in accidental airbag deployment, causing serious injury.
- Move the seat to a position that allows access to the four main bolts holding it to the floor. If the seat is inoperative, you may need to manually find a way to move it or access the bolts.
- Remove the plastic trim covers over the seat bolts.
- Unbolt the four bolts securing the seat tracks to the vehicle floor.
- Carefully tilt the seat backward to access the electrical connectors underneath.
- Disconnect the main electrical harness and any other connectors. The main connector has a locking tab that must be released.
- Carefully lift the heavy seat assembly out of the vehicle, being mindful not to scratch interior panels.
- Installation is the reverse of removal. Ensure all connectors are securely clipped in before reconnecting the battery. Torque the seat bolts to factory specifications.
Cost of a 2017-2019 LaCrosse Front Seat
The cost can vary significantly based on the source, condition, and features of the seat.
| Part Type | Estimated Cost |
|---|---|
| New OEM Assembly | $2,000 - $4,000+ (Often sold in pieces, very high cost) |
| New Aftermarket Assembly | Not Generally Available |
| Used OEM Assembly | $300 - $800 |
| Shop Labor (Installation) | $150 - $300 |
Frequently Asked Questions (FAQ)
Can I upgrade to a seat with more features, like ventilation or massage?
This is generally not feasible. The vehicle's Body Control Module (BCM) and wiring harness are not equipped to handle features your car didn't originally come with. You would need to add wiring, switches, and potentially reprogram the BCM, which is a complex and expensive job.
Why is my airbag (SRS) light on after replacing the seat?
This usually happens for one of three reasons: 1) You turned the ignition on while the seat was disconnected, logging a fault code. 2) The main electrical connector or the yellow airbag connector is not fully seated. 3) The replacement seat has a faulty airbag or sensor. Disconnect the battery again, re-check all connections, and if the light remains, you will need a professional scan tool to read the specific SRS code and diagnose the issue.
Do I need to program a replacement seat?
If you replace the seat with an identical used one, programming is not usually required. However, if you replace the Power Seat Control Module by itself, or if memory functions are not working correctly, a programming or calibration procedure by a dealer or qualified shop with a GM scan tool may be necessary.
Can I just replace a single broken motor or the heating element?
Yes, individual components like motors and heating elements can be replaced, but it requires disassembling the seat and removing the upholstery, which is a labor-intensive job. For many DIY mechanics, swapping the entire seat assembly is a faster and simpler repair.
Technical Specifications
OEM Part Numbers: 13552474 23382792 25989795 26690088 26690094 84154443 84252643 13511845 13513167
Features vary by trim level and include 8-way power adjustment, 2-way or 4-way power lumbar, heating, ventilation, massage, and memory functions. Integrated side-impact airbag is standard.
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Buick LaCrosse:
- Symptoms of a Failing Front Seat
- Buying a Used 2017-2019 LaCrosse Front Seat: What to Check
- The Critical Compatibility Check: Options and Connectors
- Verifying Trim Color
- Physical Inspection Checklist
- Known Issues, Recalls, and Service Bulletins
- Replacement Overview & Difficulty
- Cost of a 2017-2019 LaCrosse Front Seat
- Frequently Asked Questions (FAQ)
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