2003 gmc savana instrument cluster illumination lights

Posted on Feb 5, 2014

2003 GMC Savana Instrument cluster illumination lights and climate control cluster lights out. Cluster diagnostic lights good and come on ignition start up. Radio lights good and do dim with lights dimmer. Instrument lights fuse under hood good. Cluster was removed and solder on lights checked as good. Yes it is the back lamps only of the instrume

2003 gmc savana instrument cluster illumination lights
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nt cluster and the Temp control panel. Basically you cannot see the any lights at night in the instrument cluster other than the LED Mileage. The radio lights are on and do dim with the dash light dimmer in the light switch panel. Additionally, all the individual indicators lights work when you first turn on the key (ie battery, ABS, Oil ect. ) When you hit the trailer tow button it will come on and the yellow light in the cluster comes on. Everything works as I know it just no back lights. The Savana is a standard 2003 8-passenger SLT with AWD. The HVAC panel is a standard 3 dial with the heated rear window button in the lower left corner. The light in the rear window heater button does come on when you depress the rear window heat button in the HVAC panel. The HVAC panel is on the same circuit as the headlamp, Tow Haul, Door switches, and rear HVAC back lights if equipped. So if those are working I would suspect a bad HVAC panel bulb, which I dont remember them being serviceable. You can check the Brown and white wire at connector C1 and pin C. Check for power by back probing and moving the dimmer up and down. If the test light dims them its a bad HVAC panel. Where is the BCM module located in the Vehicle With both the HVAC and the instrument cluster being out it sounds like this could be the issue. Additionally, looking at the schematic, I am now questioning the dash dimmer switch as the problem. I thought by it dimming...

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