I have a 2018 Xciting 400i printed manual from Cyclepedia.
Did you do any service on the bike? Brakes, brake lines, leads, leaking fluid etc..? Also low tire pressure is not within specs it will throw off the ABS. Did you recently change tires from the standard size? do you have a deformed wheel? Have you ridden on continuously rough roads? These are some of the questions asked in the manual.
1) If a service code, they are stored in the ABS unit memory and have to be manually cleared. After the Fault has been corrected, erase the service codes
Give me your mailing address and I will photocopy the section on the ABS brakes and mail it to you. It might be the easiest way, because my online subscription ran out.
Dean