Blaine Gentry Posted June 13, 2021 Report Share Posted June 13, 2021 I just purchased a 2007 SEL and the Radio has no power. I located the owners manual to find the appropriate fuses. According the manual fuse 28 and 39 are for the radio in the under dash fuse box. I tested with a test light and found that 39 had power on both sides of the fuse but 28 which a 5 amp fuse had no power on either side of the fuse. I pulled it to test the prongs with the same result. My question is what exactly does each fuse go to in the radio? My guess is 39 is the 12v power since it’s a big 20 amp fuse but I have no clue on 28. Any help or info would be much appreciated. Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted June 15, 2021 Report Share Posted June 15, 2021 (edited) From the 09 service manual (don't have an 07 or 08), Fuse # 3, APIM (sync), 15a 18, Audio amplifier (with Audphile I or II sound system upgrades used in Edge -or- Digital Signal Processing module (used in MKX), 20a 28, ACM (radio) hot in start position, 5a 38, subwoofer -or- audio module, 20a 39, ACM (Audio Control Module ~ radio), 20a 41, accessory delay feed 15a The radio can be operated from the ignition in RUN or ACC. The ACM (radio) can send it own DTC's (fault codes) that can be read with a scan tool (using FORScan https://forscan.org) These may or may not match your car, but I believe that fuse #39 controls power to the radio in your system. Edited June 15, 2021 by enigma-2 Quote Link to comment Share on other sites More sharing options...
Blaine Gentry Posted June 19, 2021 Author Report Share Posted June 19, 2021 Thank you for you’re response. Just wondering why 28 has no power to that fuse. Probably the reason the stereo doesn’t power. I will check to see if those other fuses you mentioned are good. Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted June 20, 2021 Report Share Posted June 20, 2021 Did you check fuse 28 with the ignition on? Quote Link to comment Share on other sites More sharing options...
Blaine Gentry Posted June 20, 2021 Author Report Share Posted June 20, 2021 I checked 28 with ignition in acc and on. Still no power. In fact when I turn the ignition to acc nothing powers on. I haven’t noticed this till just now. So maybe the ignition switch isn’t sending power to the 28 fuse? Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted June 21, 2021 Report Share Posted June 21, 2021 I only have the 09 service manual so there may be some differences. One fuse supplies power to ignition switch, ACC comes off pin 6 to pin 3 of the SJB. The manual doesn't show the electrical breakdown inside the fuse panel, but you could see if power is getting to pin 3 when the ignition switch is set to ACC. I would tend to center in on the SJB being at fault more than the Ignition switch. Still, the power is supplied separately to the radio from the ignition switch when on in the RUN position and the car wouldn't start is it was defective. Have you checked for codes yet? I'd think that's your next step to take. Quote Link to comment Share on other sites More sharing options...
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