Quote:
Originally Posted by ASt85
A cold reset will often clear module problems.
With the hood fully up and locked, turn the ignition off, wait ten minutes for all the modules to power down, then disconnect the battery.
After a couple of more minutes, cross connect the +ve and -ve leads to clear all memory in the system, then with the light switch set to daylight running lamps or dipped beam and the key in position II, which prevents a voltage surge/spike firing the air bags, reconnect the leads to the battery.
If the windows still drop when turning the ignition on, then the most likely cause is a module problem; to find out exactly what is going on, you need to get the codes read using a Dice and Vida, a basic OBD II code reader will not read Volvo hood/roof codes.
NB Volvo dealers often outsource hood problems after reading the codes!
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As an engineer that technique sounds truly terrifying, to reverse polarity of the battery....
I must say I would not do that myself, I would be terrified of damaging something (at the very least fuses).
Taking the battery off yes, but cross connecting it, I wouldn’t myself.