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Q: Lights for the dashboard are not very effective

asked by on

The lights on the dashboard of my 2012 GMC Terrain get really dim randomly and the other interior lights usually do the same. Now, if the lights all went out I would know there was a fuse out or an electrical issue afoot, but dim lights don’t make sense. Why would the lights just dim down to a near-useless amount of light? This is frustrating and could be dangerous in the wrong situation. What should I be looking at to troubleshoot this? The car has 25k miles on it, so very new to be having issues!

A: Your issue is somewhat unique and may be di...

Your issue is somewhat unique and may be difficult to diagnose, mostly because of the random nature of its occurrence. That being said, it is important to look at other things that are happening at the same time of the dim lights. Are there any warning lights, has the passenger made any adjustments to seat settings, HVAC (heating, ventilation, air-conditioning) temperature or other? These may give the technician who will diagnose your issue something to go on. When the lights dim, can you change them using the dash dimmer? If so, there may be an issue in the switch itself, but this is the most unlikely cause. My recommendation is to carefully dissect the pieces of the issue when it happens. Pay attention to the other lights like the HVAC control panel, the lights in the switches on the doors, even turn on the overhead reading lamps to see if the dim lights are just on the dashboard, or if the whole interior is affected. My first instinct makes me guess that the issue is internal to the instrument cluster itself.

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