... I've learned that the 12V might be part of the problem--it is the original 12V. But the dome lights still turn on bright without the key, and the radio turns on in ACC mode, and the car is able to start, so it seems like the 12V is still functioning. Can you recommend any troubleshooting steps ...

Are you seeing any dropouts on the other cells in that module? It seems that a low voltage power supply issue would affect all the cells, not just one..? i think there is a forum thread with pictures and schematics of the CMU board, i remember seeing this https://i.imgur.com/7s6JTru.jpg

i think your problem is due to, or aggravated by, the low auxiliary battery voltage. An old, weak or worn out aux battery can cause a multitude of faults on EVs.

Not sure that this is a common fault, but there is an IC on the board that measures the cell voltages and drives the cell balancers. There may be several cases in which this chip was found to be at fault, and it could be that replacing the chip would restore your CMU. Other folks have successfully r...

size of the capacitors (С225,С227,С229,С2 3 1) [there is not a C291] the dimensional size of the caps is "0805" C227,229,231 are yellow-brown ceramics with a value of about 390 nF or .39 uF. They are all in parallel and the total across them measured about 1.22uF C225 has a pinkish color o...

Sorry to hear that it has given you some trouble right at the beginning. I wouldn't expect that missing the ground pin would cause damage to the charging cord/EVSE level 1 unit, but I suppose it is possible. The unit does a self test to check whether the ground is connected before it will allow char...

There is a small cover on the MCU that allows access to the HV terminals, but I don't think that a multimeter will give any meaningful readings--you probably need an oscilloscope to see the rise time. There is another 220uF of capacitance in the OBC that is also connected to that same point. There i...

When you try to start, do you hear any relays or contractors clacking underneath (in the main pack)? Also, same question for when you plug in the EVSE to charge the pack--any clacking noises underneath? Do you get any other DTC codes, or just the one? There is a schematic in Lic's P1A15 thread with ...

Why do you not post the auxiliary battery voltages whenever you report having issues? 1. The open circuit voltage, when OFF. 2. The pre-start voltage when key turned to ON. 3. The voltage when in READY. Here's what it looks like to me, the car was running last Autumn, then went intermittent and thro...

Hi, last status is now that the battery pack holds about 354V, but the condenser voltage is rising to 342V and falls down to 2V. Is this fault also related to that the car will not charge? Error codes are: P1A15 P1AA7 U1100 U1922 Since this car has an unknown previous history of repair attempts the...