[NAIL3]

Hello everyone, Went to get in my car this morning and there was zero electrical power. The key was also having trouble coming out of the ignition. There has been a clicking noise coming from the fuse box since I bought the car (about 4 months ago) and the headlights and taillights stay on when i pull the key out of the ignition (not sure if this has anything to do with the no power).

Did an ISTA D diag a couple weeks back and had some CAS faults and some other modules were faulty including the FRM and DSC.

Is it possible that its an alternator or maybe a bad B+ cable? Any help would be much appreciated!

[NZE90]

Fault codes?

[gbalthrop]

Originally Posted by NAIL3

... zero electrical power. The key was also having trouble coming out of the ignition. There has been a clicking noise coming from the fuse box since I bought the car (about 4 months ago) and the headlights and taillights stay on when i pull the key out of the ignition... ISTA D diag... some CAS faults...

If you have ISTA-D or ISTA+, need to provide CAS Fault Codes as starting point. We will then need to View Live Data & finally 'ISTA Test Plan'.

Of course BEFORE you can do any of that, you need to get CAS to activate KL15 Ignition Relay & KL30G Accessory Relay. There are TWO fuses that supply power to the CAS Module. Which ones & WHERE located depend upon the build date (Mo/Yr) of your 328i E90:
1) F4 (5A) & F51 (50A) if built BEFORE 9/1/2007 (earlier than 2008 model);
2) F36 & F55 if 2008 or later model.

Please check those two fuses. If you need help, locating fuses or if that is NOT causing the issue, please provide following:
1) Last-7 Characters of your VIN;
2) Does Remote Key Snap into Insert Compartment, or are "Locking Tabs" broken (key withdraws without forward press "click").
3) Do Interior lights work when driver door opened?
4) What is Battery Voltage measured at Jumpstart Terminals under hood?
5) Do you have a multimeter available?
George