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POA11 DC/DC Converter enable circuit open error code. We replaced the battery and the main and start relays. We have power but when we turn the key, it clicks in the fuse box but doesn't crank.
Issue started with a dead battery that a goofball hooked the battery terminals up backward (positive on negative and vice versa) when trying to jump the battery. Loud pop. When hooked back up correctly, the car started, drove a little ways, turned off...now won't crank...but has power. Any suggestions? Thanks in advance!
 

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Try putting car in neutral and see if it starts. Park/neutral switches can wear out sometimes. Problem may not be related to the battery issue but something new.

Give starter a tap with a hammer, if it starts solenoid contacts getting bad new starter needed.
 

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Loud pop?
Would suggest looking at all the fuses, especially the big ones.
Don't forget the fusible links
 

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The first thing to do is check the battery voltage. If the jump leads where reversed it will almost certainly have blown the ALT (alternator) fuselink, meaning the battery wouldn't be getting charged. I think the ALT fuselink was right at the battery positive terminal on a 2005 models. It was on the corner of the engine bay fusebox on earlier models.

The next think I'd suggest is you remove the START relay from the engine bay fusebox and have someone hold the key in the START position while you measure the voltage on the 4 terminals of the relay socket in the fusebox. You should have 2 terminals showing 12V and 2 showing zero volts. If the voltages are correct try a relay bypass test by using a short link wire to bridge the two terminals of the relay socket as shown below (make sure the gearbox is in P/N). See if that makes the engine crank.


 

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