GMC Troubleshooting Questions? Ask a Mechanic for Answers
what year is this ?
do you know what fuse they pulled to get the draw down ?
the 30 or the 10 amp fuse ?
fuse # ***** is a 30 amp fuse called TCCM
fuse # ***** is a 10 amp fuse and powers the radio and the hvac control module
if it is the 10 amp fuse if you unplug the radio will the draw stop happening ?
ok so its fuse # ***** the BCM fuse
if you pull relay # ***** or relay # ***** will the draw go away ?
if it has a NEW BCM and it still is drawing too much then we need to see if the BCM is powering modding off and going to sleep after it is shut off
what is the draw in MA reading ? then what is it with that fuse out ?
usually 50 MA is the rule of thumb for a draw and it looks like you are just a bit higher than that
and if you wait 15 minutes it will not drop below that ?
how long will it take to kill the battery ?
and the battery is good with amps and volts tested ( just being sure )
if that draw drops down that far with that fuse out and it has a new BCM the only logical thing that would cause that BCM not to go to sleep would be the ignition switch
that is the only thing that powers up the BCM to become awake then when off and it is not sending power the BCM should time out and go to sleep and when it is asleep the BCM should not running anything at all
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