Engine started up, turned head light switch on, but, only the parking and dash lights came on, after many attempts. The high beams worked when switched on, so I tried turning off engine, restarting, and removing key, and still no head lights. Could this be a fuse, and why only low beams?
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With a scan tool, observe the Head Lamp Switch parameter in the Dash Integration Module (DIM) Inputs data list.
Does the scan tool indicate that the Head Lamp Switch parameter is OFF?
I would think you probably don't have a GM Tech 2 factory scan tool , this is a very involved diagnostic flow chart an you can't diagnose it very easily without the factory scan tool . You could replace parts an get lucky . I would start with the high beam relay in the under hood fuse / relay center . Do you know what a relay is , not to talk down to you because I don't what you know . The relay is energized by the DIM - dash integrated module . You may want to take this to a ASE certified repair shop or the dealer !
It could be a bad connection or a bad headlight switch, but there is also a safety switch on the car that turns the dash lights out when you lose your tail lights, so before you go any further check if your tail lights are working, your car may just be telling you about another problem.
yes it could be a bulb. If you have any power going to the light then its not the fuse. the next place to look is the light switch. and the mounting bracket that the light switch plugs into. If its a newer car, then just the switch. So replace your bulb and see how it goes.