So, the bcm controls the cluster lights via PWM.
This may or may not be commanded by the ECU, but, my question is. If you change the bcm without reprogramming it, should the cluster lights work? I would think yes, since the jeep I took it from had cluster lights as well... The donor bcm was also from a 2005 sport and it was manufactured 1 day before the one it replaced, and exact same part number.
Symptoms, intermittent bus communications, no cluster lights (swapped entire cluster, and park lamp relay), jeep runs normally.
Now with a different bcm, the EVIC also doesn't work, but it worked once, but didn't show the no j1850 bus message, but that was intermittent anyhow lol!
Lastly, can a drb tool reprogram the new one without first taking the map from the old one when it was installed? Time for my jeep to be touched by the dealer for the first time?
