cokedrvrbjw Posted March 12, 2005 Report Share Posted March 12, 2005 Should i disconnect the battery to install a pcm? Will it hurt anything if i dont? Thanks. Link to comment Share on other sites More sharing options...
matt rem Posted March 12, 2005 Report Share Posted March 12, 2005 Yes you need to unhook the battery, they don't like static. Link to comment Share on other sites More sharing options...
BenKey Posted March 12, 2005 Report Share Posted March 12, 2005 FWIW, I never have. All you're really doing is disconnecting the two plugs. Once that is done, battery won't matter. Link to comment Share on other sites More sharing options...
cokedrvrbjw Posted March 12, 2005 Author Report Share Posted March 12, 2005 Link to comment Share on other sites More sharing options...
TurbochargedBerserker Posted March 12, 2005 Report Share Posted March 12, 2005 Better safe than sorry. Ben is right about the plugs, but if you bungle something, it'd be better to have no power to worry about (I'm not really sure how you could bungle it, but it only takes a second to drop the ground of the battery). Link to comment Share on other sites More sharing options...
xtremes10 Posted March 13, 2005 Report Share Posted March 13, 2005 I always remove it just in case Link to comment Share on other sites More sharing options...
Silver HO Posted March 13, 2005 Report Share Posted March 13, 2005 The only thing you need to make sure of is that the ignition is turned off. There is no power going to the PCM when the ignition is off. As far as static goes, you have more chances of causing high current damage when you reconnect the battery than by plugging in the PCM, which doesn't matter in either case as long as the ignition is turned off. We service and program PLC (programmable logic controllers) and engine control modules every day and none of the engine manufacturers require battery disconnection in their installation/removal procedures. Only that the ignition (or power to the unit) be turned off. Hope this helps. The best part about not disconecting the battery is not having to reset your radio's clock Link to comment Share on other sites More sharing options...
AWDGM Posted March 13, 2005 Report Share Posted March 13, 2005 I have never disconnected mine for a PCM swap either. A few years ago my 2000 Sierra was acting funny and the dealer replaced the PCM, they did not disconnect the battery when they did it! Butch 02 Sierra Denali Link to comment Share on other sites More sharing options...
stevebbb Posted March 13, 2005 Report Share Posted March 13, 2005 This is something I have been wondering about. I'm glad to finally get a straight answer. I just installed my pcmforless and I did unhook the battery and lost all my radio stations. Link to comment Share on other sites More sharing options...
cokedrvrbjw Posted March 13, 2005 Author Report Share Posted March 13, 2005 straight answer?? Its split up now...im just lazy and dont want to reprogram my preset channels and time back in every time i swap the pcm for service...if i do. I go in tuesday for the front diff. and ill put the pcm in wednesday...still debating on the battery though. Link to comment Share on other sites More sharing options...
Rays B4U Posted March 13, 2005 Report Share Posted March 13, 2005 This is something I have been wondering about. I'm glad to finally get a straight answer. I just installed my pcmforless and I did unhook the battery and lost all my radio stations. <{POST_SNAPBACK}> The only settings I found to have lost when I unhooked the battery to change the pcm were the clock setting. Link to comment Share on other sites More sharing options...
hank Posted March 13, 2005 Report Share Posted March 13, 2005 ive put about 7 different tunes in and changed to my track tune about an additional 10 times in and 10 times out. ive never disconnected the battery. no problems. Link to comment Share on other sites More sharing options...
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