I put in an after market radio and it worked great. I had to pull it back out to put a face plate on it, and when I put it back in, it would not work. Also, the interior lights will not work now. I have checked the fuses and find none blown. The yellow power wire does not have power to it(I checked with a tester). I don't know what else to do at this point.
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Re: No power to radio or interior lights.
I would say because the interior does not work as well that it is a blown fuse. you will have two supplies to the radio. one permanent fuse that holds the memory and an igition fuse which is live with ignition turned on. check the permanet supply fuses because the interior light will also work off one of them, same as radio. the fuse may look good you need to test across both sides of the fuse with a 12volt tester, it should work across both sides of the fuse.
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Do you know how to do automotive electrical testing ? Following wiring diagrams , checking B+ voltage at different points along the circuit . Did you use a interface module with the aftermarket radio ? The GM radio is hooked to the class 2 serial data network . Your best bet , take it to a qualified installer .
Below is an answer I found on line pasted it here - checked it out - found I had same problem. Additional notes from my repair...You must remove the scuff trim - pull back the carpet to get to the harness - inside the harness trace the two orange wires from the rear frontwards... the splice is approx. in line with the column between the front and rear doors...until you find the splice with a single orange wire - my splice was all green powder copper corrosion = no power. I pulled on the two rear wires and they immediately seperated form the single wire splice joint, came right apart - spliced -took about two minutes - radio works like new - good luck...
I found the problem to be an orange power feed wire in the passenger side rear door scuff plate that totally corroded open. Evidently water came into the car interior through the fresh air vent below the front windshield and ran back though the wire harness tunnel. The splice area was just past the passenger rear door pillar where one of the orange wires was spliced into two smaller orange wires that provided power to the factory amplifier. Respliced the wires and now works great. Please pass this on as the most likely failure mode for this vehicles inop radio when the radio lights up but no sound. RICK
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.
There are 3 fuses in the interior fuse panel that feeds radio.
no. 11(10amp) is ignition switch power to the radio it comes into radio on the TN/LB wire.
no. 27 (10amp) is hot at all times and comes in on OG/LG wire.
no. 12 (5amp) is hot in run or accessory and comes in on YE/BK wire.
Check these with 12V test light at fuse and at radio connector.
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.