Keyless entry trouble

Discussion in 'Chevy Suburban Forum (GMC Yukon XL)' started by FireRed, Dec 10, 2013.

  1. FireRed

    FireRed Rockstar 100 Posts

    My 2002 Sub key fob operates the driver door lock/unlock just fine, it will unlock but not lock all others. The passenger side door button will unlock all but will not lock anything, I have to manually lock all the doors but cannot lock the hatch. Not sure where to start! I have another thread on a battery run down issue that may be related http://www.gmtruckclub.com/forum/showthread.php/138139-intermitant-electric-spook I hope it is not dealer time!!!!!!!!!!!
     
  2. Pikey

    Pikey Moderator Staff Member 3 Years ROTM Winner 1000 Posts

    I would check the lock relay. it should be the same as the unlock relay so you can switch them to test them.
     
  3. FireRed

    FireRed Rockstar 100 Posts

    Thanks for your tip, has me wondering if the relays can cause battery drain. Might be my the root of my electrical issue.
     
  4. Pikey

    Pikey Moderator Staff Member 3 Years ROTM Winner 1000 Posts

    a relay could drain the battery if it was stuck closed. But, I would think that if one was stuck as soon as you unlocked a door manually it would relock.
     
  5. FireRed

    FireRed Rockstar 100 Posts

    I swapped the relays no change, are there any others in the circuit?
     
  6. Pikey

    Pikey Moderator Staff Member 3 Years ROTM Winner 1000 Posts

    I don't think so. It could be a BCM issue. Hopefully someone else that can lend more help will come along soon.
     
  7. FireRed

    FireRed Rockstar 100 Posts

    I read where the BCM can be a problem, I understand it needs to be re flashed when it is installed. Sounds like the re flash must be done by a dealer, anyone know for sure? Can the BCM cause over night battery run down>

    Damn I miss the days of looking at the lock buttons that stuck up so you knew what was what, too much junk on theses new cars.

    I have to laugh my buddy has an inspection station, he has this fellow that brings in his old flat head Plymouth in. Every year it shows it is running as clean if not cleaner than some newer vehicles. Makes one wonder why we have so much pollution stuff on our cars & trucks.
     
  8. Pikey

    Pikey Moderator Staff Member 3 Years ROTM Winner 1000 Posts

    Yea, the BCM must be reflashed by a dealer. Yes, a bcm issue could cause battery drain.
     

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