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Because something's wrong with it, of course. To narrow down the possibilities, you have to do some diagnosis. Start with the simple things first - check the fuse. If the fuse is good, then see if there's a reset button on the head unit - give that a try. If that doesn't work, then you remove the head unit and check to see if there's power going through the harness. If there is, then the head unit's probably shot. If there isn't, then you'll need to trace the wiring to find the fault in the circuit.
What else can I help you with?
Why isn't the instrument panel working in my 2003 Cadillac Escalade?
It's broke
What size engine does the 2003 Cadillac Escalade have?
The 2003 Cadillac Escalade has a V8 engine.
How many valves does the 2003 Cadillac Escalade have?
The 2003 Cadillac Escalade has 16 valves.
Is the 2003 Cadillac Escalade electric or gas?
The 2003 Cadillac Escalade is a gas-powered vehicle.
What is the cam type of the 2003 Cadillac Escalade?
The 2003 Cadillac Escalade has overhead valves (OHV).
What kind of transmission does the 2003 Cadillac Escalade have?
The 2003 Cadillac Escalade has a 4-speed automatic.
What is the turning circle of the 2003 Cadillac Escalade?
The 2003 Cadillac Escalade's turning circle is 39.5 ft..
What is the curb weight of the 2003 Cadillac Escalade?
The curb weight of the 2003 Cadillac Escalade is 5407 lbs..
How many valves does the 2003 Cadillac Escalade-ESV have?
The 2003 Cadillac Escalade-ESV has 16 valves.
How many valves does the 2003 Cadillac Escalade-EXT have?
The 2003 Cadillac Escalade-EXT has 16 valves.
What is the maximum payload of the 2003 Cadillac Escalade?
The maximum payload of the 2003 Cadillac Escalade is 1393 lbs..
What size engine does the 2003 Cadillac Escalade-EXT have?
The 2003 Cadillac Escalade-EXT has a V8 engine.
