Experiencing a no-start issue with your Infiniti FX35 can be frustrating. You turn the key, and nothing happens – no crank, no engine turnover. While your first instinct might be to reach for an OBD2 scanner to diagnose the problem, there are a few simple checks you should perform first, potentially saving you time and money. Sometimes, the issue isn’t complex enough to trigger specific OBD2 codes immediately, but it’s still preventing your car from starting.
One often-overlooked culprit in FX35 no-start scenarios, especially in colder climates, is the HVAC Amplifier, also known as the AC Amplifier. This component, located under your radio, can sometimes malfunction. A telltale sign, assuming you have a good battery and battery ground connection, is complete silence when you turn the key – no clicking or cranking sounds at all. While a professional mechanic might immediately suggest a new starter, which could be costly and unnecessary, consider this simpler possibility first.
Before jumping to conclusions or expensive replacements, focus on your fuse box, typically located near the emergency brake. Corrosion or film buildup on fuses can disrupt the electrical signals necessary for starting. Specifically, you should meticulously clean the fuses labeled ACC, BATTERY, AC Amplifier, and BCM. Use needle-nose pliers to carefully remove each fuse one at a time and gently clean the contacts with a wire brush. This process can seem basic, but it’s surprisingly effective.
The reason fuse cleaning can resolve a no-start issue is due to the intricate communication within your FX35’s electrical system. Over time, fuse corrosion can impede the Body Control Module (BCM) from correctly sensing the AC Amplifier. This, in turn, can affect your key-on security system, ultimately preventing the BCM from sending power to your starter. This sequence of events leads to the silent no-start condition, easily mistaken for a dead battery or a faulty starter. An OBD2 scan at this stage might not pinpoint the fuse issue directly, as it’s more of a subtle electrical resistance problem than a major system fault.
To further aid your diagnosis, and for general car maintenance, consider using a simple car accessory that displays your battery voltage. These inexpensive devices plug into your cigarette lighter and provide a real-time voltage reading. Monitoring your battery voltage before starting and after the engine is running (to check alternator function) is a proactive step in preventing future issues.
While an OBD2 scanner is an invaluable tool for diagnosing many car problems, remember to start with the basics when troubleshooting a no-start condition on your FX35. Cleaning your fuses and considering the HVAC Amplifier are quick, DIY-friendly steps that might get you back on the road without needing complex diagnostics or expensive repairs. Good luck, and remember to share your experiences to help fellow FX35 owners!
