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7 Series - E38 (1995 - 2001)

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Old 07-19-2010, 04:53 AM
waterboy56 waterboy56 is offline
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Location: Hudson, NY
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Mein Auto: 1998 BMW 740I
1998 740i - Electrical issues

Hello everyone. We are new to this site and have enjoyed reading all the helpful information supplield by informed generous people.
Electric issues that hve occured over the past few weeks are: Trunk not opening, sunroof not closing, radio not coming on, windows not working. All of these symmptons come and go. We have the Bentley manual. Where should we start?
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Old 07-19-2010, 01:53 PM
balance balance is offline
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Location: NC
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Mein Auto: 97 740iL
I would start by checking battery voltage, as low voltage will cause the ECU to go crazy and do some weird stuff.

Normal voltage is 14.4v with engine running
12.6v with engine turned off
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Old 07-21-2010, 10:48 AM
tommyb2b tommyb2b is offline
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Location: Hemet California
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Mein Auto: 1998 BMW 740IL
SOunds to me like its the ignition switch. Actually I would put money on it! Replace your Ignition switch and all will be fine. Heres a write up on how to do so. not hard at all!

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Old 07-23-2010, 03:48 PM
FABOCH's Avatar
FABOCH FABOCH is offline
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Location: Thousand Oaks,Ca
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Mein Auto: 2000 BMW 740I SPORT
HUGE +1.......Ignition switch is faulty...replace...$50-60 item at BMW...your electrical gremlins will go away
2000 740i Sport , Alpina 21`, Alpina Lip, Alpina Deco kit,Dinan 7,Dinan TB, DINAN CAI, DINAN Exhaust, Dinan Stage 5, Dinan 4/5 transmission, Dinan manifold, Highline individual interior,Eibach/Bilstein,Zimmerman Timing guides 08/13
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Old 07-25-2010, 11:36 AM
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Well check the fuses under the hood
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Old 08-17-2010, 11:06 PM
bimmersonly bimmersonly is offline
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Location: Olympia
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Mein Auto: 98 740 iL
I had similar electrical problems including the engine shutting down while driving.. Pretty scary when the steering wheel locks up going 50. I replaced the ignition switch and everything works fine again.
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