Chrysler CAN bus B problem
This jeep 2005 grand Cherokee uses CAN B network to communicate with a lot of modules, CAN B has a different bias voltage that the regular CAN, CAN B + has a range of voltage of about .5 volts when alive or talking CAN B - has a range of about 4.5 volts when alive, now, I have this car and Am getting a lot of codes related to the (-) line U0024 CAN B bus circuit open, when testing the network for voltage it fluctuates a lot, it goes from 3.8 volts to over 5 volts on the (-) bus line and on the (+) line it goes from .2 to .9 volts which is probably normal (Am still testing how this network works), there were two modules that always had a code, it was the heated seat control module and the parking control modules I disconnect those two and some other modules DDM, PDM and Am still getting codes for my minus CAN bus (U0024), my question is if you guys have more experience on this network, if my body control module is still saying that there is a problem with my B- bus line it is because maybe my body control module is the one to blame? how you guys test for a waveform signature? I scope the signal and Am going to upload a video of the signal right after so you can look at it and see what you think.
Another think to add is that the network is no shorted to ground, with the scope I can see both lines acting like a mirror to each other but maybe too noisy?