That's an interesting idea that a passing lorry might cause a contact vibration rather than actually affecting the anti-jack detector directly (you could always turn this off to check anyway).
Most of the electronics a held within the header console which is easily removed for examination. The rest are within the body computer which is probably best left alone.
	
		
			
		
		
	
				
			Most of the electronics a held within the header console which is easily removed for examination. The rest are within the body computer which is probably best left alone.
 
  
  
 
		 
			
		
		
		
	
	
			
		 
			
		
		
		
	
	
			
		