Remove radio from vehicle. remove T15 torx screws on top and sides of radio. Remove knobs and outer bezels around knobs. Face has retainer clips top and bottom. Unsnap the face of radio and remove old bulbs there are five or six in a gm radio.
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Does the dash have a printed wiring insert or is it a circuit board- remove the dash again and look over the socket that shorted out and make sure all pins are clean straight and not burned. For further repair a wiring schematic will be needed to test the light harness for power feeds for the dash and instruments.
When say "dash light" I'm assuming you mean the nighttime illumination for instruments like the speedometer for example. If your truck has a stand-alone digital clock (not part of the radio) that has a feed wire from the instrument panel lights for it to dim at night, otherwise it'd be too bright. That could be a source of a short. The radio also makes use of the dash illumination as well, making the digital display darken at night and lighting the radio's controls and face plate at night, another source of a short in this circuit. Do not ever increase fuse ratings when replacing a fuse, that defeats the safety purpose of the proper fuse being able to blow, opening the circuit which prevents wires overheating and potentially catching fire. You don't want to go there. If you have recently installed another radio the wiring may be wrong. This happened a LOT on Pontiac Firebird's and TransAm's. People often wrongly assumed all black wires are ground and ended up grounding the dash illumination input. This blew the dash light fuse and made the retracting headlight doors stay up.
I don't know the full solution; however, I do know there is a very small removable light behind the display. You must remove the face plate to access the light, the twist it out with a common/flat screwdriver. Be careful not to brake any retaining clips along the way. And you need to take the dash cover off to get at the radio, a bit of a nuisance.
Unfortunately, GM (of course) does not sell a replacement part. You might try an auto-wrecker, to find a similar inoperable radio but hopefully with a working light. Good luck.
Remove the 5 mounting screws from the instrument cluster trim plate and remove the trim plate. Remove the 4 mounting screws from the instrument panel face plate and remove the face plate.Remove the instrument light grid from the center of the cluster. From behind the instrument cluster reach behind the speedometer and disconnect the speedometer cable by releasing the tab. Pull the cluster forward just enough to detach the "check engine" light bulb from the center of the cluster. Remove the instrument cluster from the dashboard.
I'm not totally sure about the La Sabre, but there should be trim screws that hold the Dash face plate in place. There are three on the top portion of the face plate, and I think three on the bottom . The face plate extends from Light switch on left to radio on right. You may have to tilt the steering wheel column down to remove the face plate from around the steering wheel. From what I remember, the only thing that needs to be unplugged from the face plate is the plug for the rear defroster. Also, there are clips that hold the face plate in place. They just push in and out. Once the face plate is off, you can get to the radio mounting screws.
Likely it's not much different than ones just a bit older...remove the bottom panel and any screws along the bottom of the plastic dash face plate. The top is held on with clips and it should pull out, exposing the radio mounts. Go from there. They make a face plate adapter for the radio and a harness extension to help with wiring, available where they sell aftermarket radios.
this got easy after a while 2 ways, i had friends who would not take the time to spend 8dollars to buy a harness connector for a new cd player and would splice everything together like takeing the red and yellow wires and connecting them all together as one. this drains ur battery unless ur cd player can completly power down by the power button not all do... but keep this in mind on GM cars the 2 wires of the same wires like purple the one with a black stripe is ground they go together stripe on stripe also there is 2 extra wires one is ORANGE and BROWN u dont need these dont even mess with them even if u have a connector block them off THESE TWO COLORS IS FOR FACTORY STEREO IF SO THESE WIRES CAN AND WILL MAKE IT SO U DONT HAVE DASH LIGHTS so always buy a connector ond dont mess with these wires block them off and dont ground them out.
FIXED MINE! My 2000 Sienna XLE had the same problem with the lights not working. They would flicker on once in a while. I took off the face plate, cleaned the radio with a "can of air" to remove any dust, put electrical grease on the face plate contacts and the plugs on the back of the radio. Reassembled and the lights worked better, but dim and flickered off a bit. Knocked on it a few times on the side to get those contacts to work better and it is now working. My guess is the contacts on the faceplate were not making good contact. If I had to do it again, I would pull on and off the face plate a few times after installing the electrical grease to help loosen up any corrosion for a better connection. That would probably eliminate the need to beat on the side of the radio after reassembling. This fixed mine. Hope it works for you.