08 CTS 3.6, 83 Foxbody T-bird 5.0
I started my 08 CTS last Tuesday morning to go to work. Pulled my MP3 player with the 3.5 jack line out of my 18 Altima. plugged it into the Aux. jack under the center console it worked for about 2 sec. then nothing, no sound, no nothing. The monochrome display still works, all sources: AM, FM, CD, XM and Aux. all preset stations, vol. level and tone levels. Everything shows up on the display but no sound. After reading a few forums I also learned: there's no key in ign. chime, blinker sounds and also On-star are effected. Everything worked fine last Monday the car is 08 CTS 3.6L luxury with 175K miles. When I got home that night I checked every fuse in the eng. compartment fuse block and also the trunk fuse block all fuses are good. The three fuses which supply power to the sound system are, RDO (radio) 15A, SPK (speaker) 15A, Amp (amplifier) 30A, On-star 10A. I hooked up my Snap-on scanner, scanned all 16 modules and came up with a radio code B1287- Amplifier Control Signal Circuit open or shorted. Possible causes: Faulty amplifier, Amplifier wiring harness has a broken line, Amplifier connections pins corroded, Faulty radio unit. The amplifier is also controlled by the Body Control Module which gives you the key in ign. chime and blinker sounds even when the radio is off. The amplifier has a built-in safety feature, if it detects a fault within the sound system it will automatically shut off until the fault is repaired. I checked all three amp. connections. I used my test light, and I have battery power to the heavy red wire and ground continuity in the heavy black wire in connection 1 which also operates the sub woofer. The other two connections in the amp. has nothing. There should be constant power from the BCM and switched power from the radio. Just FYI my Mp3 player works in all my other vehicles, so it did not blow the amp. My question is: does anybody have a current wiring diagram for this system, or is this a Dealer item to fix?