Hello, I'm Chris.I will do my best to answer your question fast and accurate using the info you have provided. Thanks for visiting Just Answer.
Does the dash dimming issue only occur with the headlights set in the auto position, or when commanding the headlights on with switch which also dims the headlights?
When your driving at night ( night being a black sky, not dawn or dusk or sunset) do the dash lights change light intensity?
I do not leave the headlight switch in the auto position. I turn them on after I start the car and off before I shut off the car. The dimming occurs while driving with the lights in the on position, have not driven with the lights in the auto position so I am not sure if it would be the same or not. I have noticed the change in the light intensity when turning the the light switch. Used this as an example for the service technitian so that he could see the difference in the light intensity while trying to solve the problem.
The light dimming occurs at all times of the day, not just at night. I have an hour commute to/from work every day. I am driving to work in the morning (after sunrise) and home after dark and have noticed it at both times. I have also noticed it during the afternoon hours when driving on my days off from work. Does not appear to be due to changes in light outside in the varying hours of the day.
If this below TSB was performed and not a fix for this concern,
then diagnostics need to be performed to see if the dimmer switch is faulty or to see if the FET in the SJB is faulty meaning the SJB needs to be replaced. You can see a little bit about what I am talking about and an understanding on how it works and how they will diagnose it using the download HERE.
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