2019-2020 Kia K900 Master Window Switch: Diagnosing Failures and Buying a Used Replacement
This guide covers the common failure symptoms, diagnostic steps, and what to look for when purchasing a recycled OEM master window switch for your 2019-2020 Kia K900.
- The correct OEM part number is 93570-J6100-SA1; you must match this exactly for all functions to work.
- Failure is often caused by liquid spills; inspect any used switch for corrosion on the electrical pins or sticky residue around the buttons.
- If a window works from its own switch but not the master switch, the master switch is the most likely problem.
- A critical safety recall (SC300 / 24V169000) exists for a potential engine fire risk from a leaking turbo oil line; ensure this has been addressed.
Symptoms of a Failing K900 Master Window Switch
When the master switch begins to fail, the symptoms are often electrical and can be intermittent at first. Because the Kia K900 is a low-volume vehicle, widespread issues are not commonly reported, but the switch is susceptible to the same failures as any other power window switch. Look for these common signs:
- One or More Windows Inoperable: The most common symptom is when one or more windows stop responding to the switch. If a window works from its own door switch but not from the master switch, the master switch is the most likely culprit.
- Intermittent Operation: You might find that a window or lock works one moment and not the next. This can be caused by worn internal contacts within the switch assembly.
- Door Locks or Mirrors Not Responding: Since the door lock and mirror controls are integrated, a failure in the switch's internal circuit board can cause them to stop working.
- Window Goes Down But Not Up: If a window will roll down but struggles or refuses to roll back up, it often points to worn-out contacts for the 'up' direction inside the switch.
- No Sound from the Window Motor: When you press a working switch, you can often hear a faint click from the switch and a hum from the window motor inside the door. If you press the button and hear absolute silence, it suggests the switch isn't sending power to the motor.
- Window Lock Button Stuck or Ineffective: The button that prevents passengers from using their windows can fail, either permanently locking them out or not working at all.
Pro Tip: Before assuming the switch is bad, always check the basics first. Press the window lock button a few times to ensure it isn't accidentally engaged. Also, check the main power window fuse in your vehicle's fuse box.
Known Issues, TSBs, and Recalls for the 2019-2020 Kia K900
As of mid-2026, there are no specific recalls or Technical Service Bulletins (TSBs) from Kia or the NHTSA that directly address the master window switch for the 2019-2020 K900. However, owners should be aware of a critical safety recall for this vehicle.
Important Safety Recall: Engine Fire Risk. Kia issued recall SC300 (NHTSA ID: 24V169000) for all 2019-2020 K900 models. The left turbocharger oil feed pipe can deteriorate from heat, leading to an oil leak. This oil can drip onto hot exhaust components, creating a significant risk of an engine compartment fire. Warning signs include a burning oil smell, white smoke from the engine area, or an oil pressure warning light. Dealers will replace the oil feed pipe and hose assembly free of charge. It is crucial to ensure this recall has been performed on any 2019-2020 K900.
Buying a Used Door Lock and Window Switch
Since new aftermarket options for this specific part are not readily available, a used OEM switch is often the most practical and cost-effective solution. Here’s what to look for to ensure you get a quality part.
1. Verify the Part Number
This is the most critical step. You must match the OEM part number exactly. For the 2019-2020 Kia K900 driver's master switch, the correct part number is 93570-J6100-SA1 or 93570J6100SA1. Different part numbers may look identical but have different internal electronics for different trim levels or features, and will not function correctly.
2. Inspect for Liquid Damage
The number one killer of master window switches is liquid spills. Rain from an open window or a spilled drink can seep into the switch, corroding the circuit board and causing erratic behavior. When inspecting photos of a used part, look for:
- Sticky Residue: Check the crevices around the buttons for any signs of dried soda or coffee.
- Corrosion on Pins: Look at the electrical connector pins on the bottom of the switch. They should be clean and shiny. Any green or white crusty buildup is a major red flag for moisture damage.
3. Check the Physical Condition
Examine the button graphics and overall condition. A switch from a low-mileage vehicle will have crisp, clear graphics on the buttons. Worn-off white markings indicate heavy use and a higher likelihood of internal wear. The buttons should have a firm, tactile click when pressed, not a mushy or sticky feel.
4. Why Used OEM is a Smart Choice
For a complex electronic module like this, a used original equipment (OEM) part is often superior to a new, cheap aftermarket alternative (if one were available). The OEM part was designed specifically for your vehicle, ensuring perfect fitment, connector compatibility, and correct electronic communication. Aftermarket parts can have issues with button quality, incorrect illumination, and premature electronic failure.
Cost Comparison
Understanding the cost difference helps illustrate the value of a recycled OEM part. Prices can vary based on location and availability.
| Part Type | Estimated Cost |
|---|---|
| New OEM | $415 - $630 |
| New Aftermarket | Not commonly available |
| Used OEM | $50 - $100 |
| Shop Labor | $100 - $150 |
Replacement Overview & Difficulty
Replacing the master window switch on a 2019-2020 K900 is a straightforward job that most DIY mechanics can complete in under 30 minutes.
- Difficulty: 1/5 (Beginner)
- Tools Needed: Plastic trim removal tool, possibly a Phillips head screwdriver.
- Process: The switch assembly is typically held in the door panel by clips. The first step is to use a plastic pry tool to carefully lift the switch trim panel out of the armrest. Once lifted, you can access the electrical connectors on the underside. Depress the tabs on the connectors to release them, and then the old switch can be removed from the panel (it may be held by clips or small screws). Installation is the reverse of removal.
Frequently Asked Questions (FAQ)
Only my driver's window works. Is the switch bad?
This is a classic symptom. First, check that the window lock button isn't on. If it's off and only the driver's window works from the master switch, it's highly probable the master switch has failed internally.
Do I need to reprogram the new switch?
No, a replacement switch with the exact same part number should be a plug-and-play installation with no programming required. However, you may need to reset the 'auto up/down' feature. To do this, roll each window all the way down, then roll it all the way up and hold the switch in the 'up' position for a few seconds until you hear a faint click.
My window is slow or moves intermittently. Is that the switch or the motor?
It could be either, but slow movement often points to a failing window motor or a binding window regulator inside the door. If the window stops at the same spot every time, the problem is likely mechanical (regulator/track). If the failure is random and seems electrical, the switch is a more likely suspect.
Can I use a switch from a different Kia model?
No. Even if a switch looks similar and physically fits, the internal wiring and electronic logic are specific to the model and its options. You must use a switch with the part number 93570-J6100-SA1 for the 2019-2020 K900 to ensure all functions (windows, locks, mirrors, memory) work correctly.
Technical Specifications
OEM Part Numbers: 93570-J6100-SA1 93570J6100SA1
Driver's side master control for power windows, power door locks, and power mirrors.
We Have This Part in Stock
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.
- Kia K900:
- 🛍️ Shop This Part
- Symptoms of a Failing K900 Master Window Switch
- Known Issues, TSBs, and Recalls for the 2019-2020 Kia K900
- Buying a Used Door Lock and Window Switch
- 1. Verify the Part Number
- 2. Inspect for Liquid Damage
- 3. Check the Physical Condition
- 4. Why Used OEM is a Smart Choice
- Cost Comparison
- Replacement Overview & Difficulty
- Frequently Asked Questions (FAQ)
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