ABS and ESP lights come on and go off on 2002 Audi A6

the abs and esp lights come on and then go off and the insterment panel then goes dead this keeps repeating I charged the battery after removing the cables car was sitting for 2 weeks but did start up with no problem now the radio says safe on it and the dash goes dead after the abs and esp lights come on and go off any help would be great

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1 answer
The abs control unit has most likely failed, but should first be tested. If abs connector is unplugged, cluster may not go dead, due to abs module fault. Radio is in safe mode because battery was disconnected. You will need the radio code to radio to work again.