2000 Volvo S40 Logo
Posted on Jan 07, 2011
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I had disconected a battery overnight. My key fob hasn't worked ewer since. What can I do?

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  • Posted on Mar 29, 2013
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WELL FOR START : INSTALL BATTERY , MAKE SURE IT IS POWERED UP TO 4 HOURS .THAT SHOULD DO IT >> FOR THE "ASE " TECH : FYI ECU DONT LOOSE MEMORY JUST BECAUSE THE BATTERY DISCONNECTED !! I THINK YOU NEED TO TAKE SOME REFRESHMENT COURSES SO YOU DONT JUST GIVE ADDVICE YOU GOT NO CLUE ABOUT !!!!!!!!!!!

  • Anonymous Mar 29, 2013

    WELL FOR START : INSTALL BATTERY , MAKE SURE IT IS POWERED UP TO 4 HOURS .THAT SHOULD DO IT >> FOR THE "ASE " TECH : FYI ECU DONT LOOSE MEMORY JUST BECAUSE THE BATTERY DISCONNECTED !! I THINK YOU NEED TO TAKE SOME REFRESHMENT COURSES SO YOU DONT JUST GIVE ADDVICE YOU GOT NO CLUE ABOUT !!!!!!!!!!!

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  • Posted on Jan 07, 2011
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When the battery was disconnected the computer lost it memory and it has to be programed with a Volvo Scan tool. There are other computer relearn procedures for vehicle or system operation. These may include:

Initial control unit programing

Traction control yaw sensor initializing

Multiplex communication

Anti-theft system or engine immobilizer system passwords


Volvo still won

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