A Guide to the Ignition Switch for the 2003-2008 INFINITI FX35
If your FX35 is having trouble starting or the key is hard to turn, your ignition switch could be the problem.
- Rule out the battery, starter, and key/immobilizer issues first, as they are common no-start culprits on the FX35.
- A bad ignition switch can cause a no-start, intermittent stalling, or accessory power loss.
- Aftermarket brands like Standard Ignition and Beck Arnley offer reliable, cost-effective alternatives to the OEM part.
- Replacement is a manageable DIY task that does not require special programming.
Is Your FX35 Ignition Switch Failing?
The ignition switch in the 2003-2008 INFINITI FX35 is a durable part, but it can wear out over time. The internal electrical contacts can fail, leading to a variety of frustrating and intermittent issues. Before you assume the switch is bad, it's important to rule out more common problems on the FX35, like a weak battery, a failing starter, or an issue with the anti-theft immobilizer system.
Check This First!
Many starting problems on the FX35 are not caused by the ignition switch. Owners frequently report issues with a dead battery, a bad starter motor, or the vehicle's security system not recognizing the key. If your car cranks but won't start, the issue might be related to the immobilizer system or fuel delivery. 🎬 See a professional diagnosis of an FX35 crank-no-start condition. If you hear a clicking sound, the starter or battery is the likely culprit.
🎬 Watch: Troubleshooting a 2004 FX35 that won't crank or start.Common Symptoms of a Bad Ignition Switch
If you've ruled out other causes, here are the classic signs of a failing ignition switch:
- Engine Won't Crank: You turn the key to the 'START' position, but nothing happens. The dashboard lights may or may not come on, but the starter motor is silent.
- Starts and Immediately Stalls: The engine fires up but dies as soon as you release the key from the 'START' to the 'ON' position. This indicates the switch isn't providing power in the 'ON' position.
- Key is Hard to Turn: The key feels stuck or is difficult to turn between positions. This can be a problem with the lock cylinder or the switch itself binding.
- Flickering Dashboard or Loss of Accessories: Your radio, power windows, or dashboard lights may cut out intermittently while driving. Wiggling the key in the ignition might cause these systems to turn on and off.
- Stalling While Driving: In serious cases, a faulty switch can lose connection while you are driving, cutting power to the engine. This is a critical safety issue.
Choosing the Right Aftermarket Ignition Switch
When replacing the ignition switch, you don't need to pay high dealership prices for an OEM part. Several reputable aftermarket brands offer quality replacements that provide excellent value. These parts are designed to match the original's fit and function.
Tier 1: OEM-Quality Replacements
- Standard Ignition (SMP): A well-known and trusted brand in the industry, Standard often produces parts that meet or exceed original specifications. They are known for using quality materials like copper alloy conductors for reliability.
- Beck Arnley: This brand specializes in parts for foreign nameplate vehicles and has a reputation for sourcing components that match OE form, fit, and function. They are a solid choice for a direct-fit replacement.
Tier 2: Value-Oriented Options
- URO Parts: URO is known for providing affordable parts, especially for European vehicles. While they can be a good budget-friendly choice, reviews are sometimes mixed on the finish or long-term durability of certain parts.
- Rostra Powertrain: Rostra is a large manufacturer of various automotive electronics, primarily known for transmission components. While they are an established company, specific reviews for their ignition switches are less common.
| Part | Cost Range (Part Only) |
|---|---|
| New OEM INFINITI Ignition Switch | $150 - $250 |
| New Aftermarket Ignition Switch | $36.00 - $86.38 |
| Shop Labor | $100 - $200 |
Pro Tip: Check Your Grounds
The first-generation FX35 is known for having grounding issues that can cause strange electrical problems, including repeat failure of ignition coils (TSB ITB11-017a). While this TSB isn't for the ignition switch, ensuring your battery cables and engine ground points are clean and tight is a good preventative measure when working on the electrical system.
Frequently Asked Questions (FAQ)
Do I need to program a new ignition switch?
No. The ignition switch itself is a mechanical and electrical component that does not require programming. However, your key contains a transponder chip that is read by the vehicle's immobilizer system. The switch simply powers the components; it is not part of the security handshake.
Is it the ignition switch or my key?
If your key is worn, it may have trouble turning the lock cylinder. If the battery in your key fob is dead, the car may not start, but this is an immobilizer issue, not an ignition switch problem. If you can turn the key, but accessories or the engine are not getting power correctly, the switch is the more likely culprit.
Can I replace just the ignition switch myself?
Yes, this is a feasible DIY job for someone with basic mechanical skills. It involves removing the plastic covers around the steering column to access the switch, which is typically held on by a couple of screws and has a wiring connector. It does not require removing the steering wheel or airbag.
🎬 Watch: Step-by-step DIY guide to removing the ignition switch.What's the difference between the ignition switch and the ignition lock cylinder?
The lock cylinder is the mechanical part you put your key into. The ignition switch is the electronic part behind it that the lock cylinder turns. If your key is hard to turn, the problem could be in either part. If the key turns fine but you have electrical issues, the switch is the likely problem.
Helpful Videos
Technical Specifications
The ignition switch is the electrical component located on the back of the ignition lock cylinder. It does not include the lock cylinder or keys.
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.
- INFINITI FX35:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your FX35 Ignition Switch Failing?
- Check This First!
- Common Symptoms of a Bad Ignition Switch
- Choosing the Right Aftermarket Ignition Switch
- Tier 1: OEM-Quality Replacements
- Tier 2: Value-Oriented Options
- Pro Tip: Check Your Grounds
- Frequently Asked Questions (FAQ)
- 🎟️ Get 5% Off