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Alonso crashed into a wall at 142km/h during the second pre-season test and spent three nights in hospital after suffering from concussion.
The cause of the crash is still up in the air, with McLaren blaming an unpredictable gust of wind.
Some reports had suggested that the two-time world champions had received an electric shock from the car’s energy recovery system, prompting Button to begin his own investigation.
“I needed to know that before getting into the car at the next test so I made sure of it. When you are driving a Formula One car at the limit you need to be sure,” Button is quoted as saying by The Guardian.
“There was nothing wrong with the car whatsoever and he did not, as far as I’m aware, get an electric shock.
“Everything is working correctly. The engineers have got every test under the sun to understand steering loads and everything involving the car.”
The crash has forced Alonso to miss the season-opening Australian Grand Prix in Melbourne.