I also pose this question on another post in regards to my past brake issue.
I had a wierd pulse in my brake pedal the first time I would press the brakes from a cold start. I had several people tell me this was my imagination, but I was pretty sure it was not. After a recent brake job, I was unable to get the pedal stiff and my 2006 Mallibu Maxx has an ABS system which requires a GM computer to do a ABS bleeding procedure so I grudgingly brought the car back to the dealer for a pro-bleeding, with their fancy computer. They called me and said that they could not communicate with the computer on the car, and would need to do a full “Diagnostic” to determine why.
What they found, or claim to have found, is that my after market stereo is the cause for this. I’ve had my Sony stereo installed in the car almost as long as I’ve had it, for 5 years, and I’ve never had a problem, or had anyone tell me this was a problem. They were able to communicate once they disconnected it and they completed the bleeding.
Since I’ve gotten the car back the pulse in my brakes is gone, it hasn’t done it once in over a week. I’ve also noticed that my cruise control now works again, it hasn’t worked in while, but I almost never use it so I’ve hardly even noticed it or thought to mention it.
Now here is my new question, Should I believe that the stereo is really the issue, or is there something else, that has caused these glitches, and the stereo just happens to tie it all together.