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Discussion Starter #1
hello friends i dont know what the hell is going with my car it does not want to charge. i have changed 2 chargers and nothing, the yellow light comes on and that's it, when i am in mountain mode the battery is charging and holding charge well. DTC was P0D39, the car had front accident, and T18 mounting head was broken. the charger itself i could not see any physical damage on it, is it possible that T18 charger was damaged in accident? if i could not see any physical damage on it exept broken tab? any way to test it with multi-meter? thanks a lot
 

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Was the computer reset when you had the car repaired? There's a flag in the system that disables the wall charger until it can be repaired. Kind of like the OLM - needs to be reset when the service is completed.
 

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Discussion Starter #3
yest the car was fully reseted. i dont know what it wants, is it possible that something was damaged inside the T18 charger? as i mentioned the charger had only 1 broken tab on it i could not see any physical damage on it
 

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might need a RE_FLASH not just a reset ( ie a re-programming) like we needed for a float switch glitch.
 

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Discussion Starter #7
i did it they have reprogrammed the car but without results, DCT is U1883 and P0D39. i would like to know how can i test T18 charger with multimeter to make sure it works or not
 

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ufazes: EVSE's and the internal charger within electric vehicles communicate with each other via a 12VDC square wave "pilot signal" and two small microcontroller chips. The charger will not put any juice into the battery until the two signals have synced so I doubt very much a multimeter will show you any output at all unless you can force the charger to assume an EVSE is connected and ready.
 

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Discussion Starter #9
guys can you tell me please from where should i start? and what kind of wires to check with multimeter? i want to clarify T18 is working or not?
 

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Discussion Starter #11 (Edited)
thanks a lot, i have an idea how to test it. remove front bumper for access to T18 charger. then i will disconnect upper high voltage wire on T18 inverter which inputs power from EVSE. then i will plug the car to charge and in other hand take a multimeter and check if i have a voltage in high voltage cable "upper cable which i have disconnected from T18 charger" if everything works and there is no a wire cut multimeter should show me some kind of voltage. then i will connect back upper high voltage cable to T18 charger,after that i will disconnect the lower cable, and check if i have a voltage in inverter outlet tab where the cable connects. if the voltage goes in and out from inverter then i have to find wire cut to the way of battery.
 

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what kind of fuse? do you have any pic where is it located?
fuses are on the out put from battery, so it would be for the 12v inverter not 360v inverter
looks like it will know if jack is disconnected , so to read voltage you might have to leave it all connected and take cover off of inverter and measure terminals while hot, not a safe way of doing things, you get tangled up in 360v dc stuff and you might not be able to let go- that's the risk

View attachment 156325
someone should map out the hv side so you can look and see where the voltages stops and shows what modules are locked out because of fault, the computers are monitoring it anyway
 

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Discussion Starter #15 (Edited)
thanks a lot i appreciate, just to clarify you mean 12 volt battery charger inverter which one is near 12 volt battery? it seems its charging 12 volt battery i took a pics in first page. one more question please, the T18 inverter which is under the front bumper it had broken tab on it, so when i took it for repair master pours water in to avoid overheating while he was soldering the tab. so could it damage the inverter?
 

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I assume its the aluminium mounting tab on the box that your talking about
if it had enough force on it to break tab on box, is not good for printed circuit board inside, may put fractures in copper traces on the printed circuit boards
when you say solder I assume weld if aluminum box tap
high current and high heat for welding or soldering,not a good solution for printed circuit boards, but can be done
if I understand correctly he filled the box with water where the circuit board is, not a good solution for printed circuit boards, but can be done
what type of water did he use , distilled water the best, tap water not the best, well water , give up
and finally how did he remove the water, let it sit there for a couple days open to dry out , sort of ok, he blew it out with compressed air at 10 to 15 psi , better than sort of ok, or he blasted it out with full air pressure and fried every thing with the static electricity produced by the air going across every component
if he just poured water over the sealed box to keep heat down , is ok but makes weld brittle and may rebreak over time
 

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Discussion Starter #17
you are right he fills the box with a regular water not distilled, when he finished he just poured out water and thats it, he did not dry it. i wonder if it could damage the inverter? and should i try to open it and dry? may be inside is a little oxidation or broken wire
 

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50/50 shot at it
most of gm printed circuit boards are epoxy incased to keep mosture out
the hazard will be at the componets that are above the coating and in a inverter there are a few
wash it out with distilled water to get the salts out from using regular water. dry it completely check for cracks near the impact spot and try her again
 

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Discussion Starter #19 (Edited)
hello friends a little news today i opened the inverter this is what it looks like, i think it should not have so much corrosion and oxidation inside i bought some contact cleaner lets see what it gonna do, what do you think is it possible the car wont charging because this oxidation?
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