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#1
08-20-2015, 01:28 AM
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Electrical malfunction message and trifecta of lights
I am having this weird constant, persistent power issue. I will be driving and after about 15-30 minutes, all of the sudden I will lose power to the CCC, radio, instrument cluster, sunroof, rear windows only. I get all the lights and error messages: Trans fault, Electrical Malfunction, Passive Restraint, check engine light, brake lights on, etc, etc. Front power windows work and the X drives fine, no performance issues whatsoever. THEN, when I put my foot on the brake all power comes back like nothing happened although the airbag message and and check engine light stays on. I have pulled codes (and keep clearing them) and it looks like it may be my Junction box or maybe my CAS (comfort access) module failing, showing loss of communication but what I don't get is why everything is fine when I apply my brakes. Could be a problem with the CAN BUS? I replaced the battery (which was fine), its not my battery IBS and my alternator is putting out 14.5 volts. I checked all fuses, wiggled, pulled out and plugged back in all connections checked for frayed wires. My car is torn apart inside. Another guess is something to do with the braking system since every time I apply my brake all power comes back. Doesn't seem to be weather related. 2007 X5 100,000 miles. I have searched and searched the forums and have found no like issues. Its been frustrating to say the least. Any ideas or help would be appreciated.
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2003 X5 4.4 (sold) 1980 320I (sold) 1996 Z3 
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#2
08-20-2015, 07:16 AM
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Electrical load/consumer Deactivation pages 8 - 9
https://drive.google.com/folderview?...&usp=drive_web
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Believe nothing read or heard without verifying it oneself unless it, Weltanschauung congruent, fits ones worldview.
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#4
09-26-2015, 04:17 PM
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I had same issue
poped code p1891 and dsc, flat tire, abs, brake, trans failsafe, sls inact, radio would go off and all lights all at once checked battery voltage = spiked 17-18v intermitedly got alternator rebuilt good now
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04 black on sapphire 4.8is personally put 90,000kms fully loaded minus the fold out trunk floor -20' DUB X10 3 piece rims staggered setup -LED angel eyes + interior lights + e70 style shifter -AFE stage 2 intake system -x-pipe/resonator delete -UV coat windshield -rebuilt Pano roof -dynavin N6 -all front and rear end suspension parts and both front cv shafts replaced -OEM hitch  And 2007 GSXR750
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