What is the reason for the Prado 4LO light to illuminate?
3 Answers
Prado 4LO light illumination indicates that the vehicle has switched to the low-speed cruise system. Below is a detailed introduction to the Prado's low-speed cruise system: 1. Prado: The Prado is an imported ORV, derived from Toyota's globally renowned LAND-CRUISER series. In 1996, Toyota officially named the LAND-CRUISER-FJ90 as the PRADO Prado, marking the true first generation of the Prado. 2. Low-speed cruise system: The cruise control system, abbreviated as CCS, is also known as the cruise control device, speed control system, or autonomous driving system. It can reduce unnecessary speed changes and also save fuel.
The 4LO light on the Prado came on. I've driven this vehicle for several years, and usually, it's when I intentionally switch to low-range four-wheel drive mode during off-roading, and the system normally lights up the indicator. But if it comes on for no reason while you're driving on the road, it could be due to a stuck switch, a faulty sensor, or a loose electrical connection causing a false signal. Once when I was driving on a mountain road, this happened. At first, I thought it was a minor issue, but halfway through, I heard strange noises. After stopping to check, I found that the transfer case hadn't reset properly. I quickly manually shifted the selector lever back to the two-wheel drive position, and the light went off. If it happens again, I suggest stopping immediately to check the mode settings. Don't force it to keep driving to avoid damaging the transmission. If it really doesn't work, it's best to take it to a professional shop to check the wiring, fuses, etc. It might even be a relay issue.
From a mechanic's perspective, the 4LO light usually comes on due to sensor failure or control module short circuits. Common causes include the mode selector switch getting stuck or relay contacts burning out. Don't panic yet—first try some basic troubleshooting: restart the engine, check if the selector lever under the driver's seat is stuck in low range, and inspect the corresponding fuse in the fuse box. If the light remains on, you'll likely need to open up and examine the transfer case controller, or it could be aging wiring connectors causing false signals. It's best not to force-drive the vehicle, as this might lead to drivetrain issues and component wear. Get it checked at a reputable shop early to avoid bigger problems down the road.
